0.007099
0.000000
0.000000
0.000000
0.004964
0.000000
0.000000
0.000000
0.004241
0.00000
0.00000
0.00000
Raves, M.L.
Giles, K.
Schrag, J.D.
Schmid, M.F.
Phillips Jr., G.N.
Wah, C.
Howard, A.J.
Silman, I.
Sussman, J.L.
http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic
16
90.00
90.00
90.00
140.860
201.460
235.770
C3 H7 N O2
89.093
y
ALANINE
L-peptide linking
C6 H15 N4 O2 1
175.209
y
ARGININE
L-peptide linking
C4 H8 N2 O3
132.118
y
ASPARAGINE
L-peptide linking
C4 H7 N O4
133.103
y
ASPARTIC ACID
L-peptide linking
C3 H7 N O2 S
121.158
y
CYSTEINE
L-peptide linking
C5 H10 N2 O3
146.144
y
GLUTAMINE
L-peptide linking
C5 H9 N O4
147.129
y
GLUTAMIC ACID
L-peptide linking
C2 H5 N O2
75.067
y
GLYCINE
peptide linking
C6 H10 N3 O2 1
156.162
y
HISTIDINE
L-peptide linking
C6 H13 N O2
131.173
y
ISOLEUCINE
L-peptide linking
C6 H13 N O2
131.173
y
LEUCINE
L-peptide linking
C6 H15 N2 O2 1
147.195
y
LYSINE
L-peptide linking
C5 H11 N O2 S
149.211
y
METHIONINE
L-peptide linking
C9 H11 N O2
165.189
y
PHENYLALANINE
L-peptide linking
C5 H9 N O2
115.130
y
PROLINE
L-peptide linking
C3 H7 N O3
105.093
y
SERINE
L-peptide linking
C4 H9 N O3
119.119
y
THREONINE
L-peptide linking
C11 H12 N2 O2
204.225
y
TRYPTOPHAN
L-peptide linking
C9 H11 N O3
181.189
y
TYROSINE
L-peptide linking
C5 H11 N O2
117.146
y
VALINE
L-peptide linking
N
1
N
N
N
2
S
C
N
3
N
C
N
4
N
O
N
5
N
C
N
6
N
O
N
7
N
H
N
8
N
H
N
9
N
H
N
10
N
H
N
11
N
H
N
12
N
H
N
13
N
H
N
14
N
N
N
15
S
C
N
16
N
C
N
17
N
O
N
18
N
C
N
19
N
C
N
20
N
C
N
21
N
N
N
22
N
C
N
23
N
N
N
24
N
N
N
25
N
O
N
26
N
H
N
27
N
H
N
28
N
H
N
29
N
H
N
30
N
H
N
31
N
H
N
32
N
H
N
33
N
H
N
34
N
H
N
35
N
H
N
36
N
H
N
37
N
H
N
38
N
H
N
39
N
H
N
40
N
H
N
41
N
N
N
42
S
C
N
43
N
C
N
44
N
O
N
45
N
C
N
46
N
C
N
47
N
O
N
48
N
N
N
49
N
O
N
50
N
H
N
51
N
H
N
52
N
H
N
53
N
H
N
54
N
H
N
55
N
H
N
56
N
H
N
57
N
H
N
58
N
N
N
59
S
C
N
60
N
C
N
61
N
O
N
62
N
C
N
63
N
C
N
64
N
O
N
65
N
O
N
66
N
O
N
67
N
H
N
68
N
H
N
69
N
H
N
70
N
H
N
71
N
H
N
72
N
H
N
73
N
H
N
74
N
N
N
75
R
C
N
76
N
C
N
77
N
O
N
78
N
C
N
79
N
S
N
80
N
O
N
81
N
H
N
82
N
H
N
83
N
H
N
84
N
H
N
85
N
H
N
86
N
H
N
87
N
H
N
88
N
N
N
89
S
C
N
90
N
C
N
91
N
O
N
92
N
C
N
93
N
C
N
94
N
C
N
95
N
O
N
96
N
N
N
97
N
O
N
98
N
H
N
99
N
H
N
100
N
H
N
101
N
H
N
102
N
H
N
103
N
H
N
104
N
H
N
105
N
H
N
106
N
H
N
107
N
H
N
108
N
N
N
109
S
C
N
110
N
C
N
111
N
O
N
112
N
C
N
113
N
C
N
114
N
C
N
115
N
O
N
116
N
O
N
117
N
O
N
118
N
H
N
119
N
H
N
120
N
H
N
121
N
H
N
122
N
H
N
123
N
H
N
124
N
H
N
125
N
H
N
126
N
H
N
127
N
N
N
128
N
C
N
129
N
C
N
130
N
O
N
131
N
O
N
132
N
H
N
133
N
H
N
134
N
H
N
135
N
H
N
136
N
H
N
137
N
N
N
138
S
C
N
139
N
C
N
140
N
O
N
141
N
C
Y
142
N
C
Y
143
N
N
Y
144
N
C
Y
145
N
C
Y
146
N
N
N
147
N
O
N
148
N
H
N
149
N
H
N
150
N
H
N
151
N
H
N
152
N
H
N
153
N
H
N
154
N
H
N
155
N
H
N
156
N
H
N
157
N
H
N
158
N
N
N
159
S
C
N
160
N
C
N
161
N
O
N
162
S
C
N
163
N
C
N
164
N
C
N
165
N
C
N
166
N
O
N
167
N
H
N
168
N
H
N
169
N
H
N
170
N
H
N
171
N
H
N
172
N
H
N
173
N
H
N
174
N
H
N
175
N
H
N
176
N
H
N
177
N
H
N
178
N
H
N
179
N
H
N
180
N
N
N
181
S
C
N
182
N
C
N
183
N
O
N
184
N
C
N
185
N
C
N
186
N
C
N
187
N
C
N
188
N
O
N
189
N
H
N
190
N
H
N
191
N
H
N
192
N
H
N
193
N
H
N
194
N
H
N
195
N
H
N
196
N
H
N
197
N
H
N
198
N
H
N
199
N
H
N
200
N
H
N
201
N
H
N
202
N
N
N
203
S
C
N
204
N
C
N
205
N
O
N
206
N
C
N
207
N
C
N
208
N
C
N
209
N
C
N
210
N
N
N
211
N
O
N
212
N
H
N
213
N
H
N
214
N
H
N
215
N
H
N
216
N
H
N
217
N
H
N
218
N
H
N
219
N
H
N
220
N
H
N
221
N
H
N
222
N
H
N
223
N
H
N
224
N
H
N
225
N
H
N
226
N
H
N
227
N
N
N
228
S
C
N
229
N
C
N
230
N
O
N
231
N
C
N
232
N
C
N
233
N
S
N
234
N
C
N
235
N
O
N
236
N
H
N
237
N
H
N
238
N
H
N
239
N
H
N
240
N
H
N
241
N
H
N
242
N
H
N
243
N
H
N
244
N
H
N
245
N
H
N
246
N
H
N
247
N
N
N
248
S
C
N
249
N
C
N
250
N
O
N
251
N
C
Y
252
N
C
Y
253
N
C
Y
254
N
C
Y
255
N
C
Y
256
N
C
Y
257
N
C
N
258
N
O
N
259
N
H
N
260
N
H
N
261
N
H
N
262
N
H
N
263
N
H
N
264
N
H
N
265
N
H
N
266
N
H
N
267
N
H
N
268
N
H
N
269
N
H
N
270
N
N
N
271
S
C
N
272
N
C
N
273
N
O
N
274
N
C
N
275
N
C
N
276
N
C
N
277
N
O
N
278
N
H
N
279
N
H
N
280
N
H
N
281
N
H
N
282
N
H
N
283
N
H
N
284
N
H
N
285
N
H
N
286
N
H
N
287
N
N
N
288
S
C
N
289
N
C
N
290
N
O
N
291
N
C
N
292
N
O
N
293
N
O
N
294
N
H
N
295
N
H
N
296
N
H
N
297
N
H
N
298
N
H
N
299
N
H
N
300
N
H
N
301
N
N
N
302
S
C
N
303
N
C
N
304
N
O
N
305
R
C
N
306
N
O
N
307
N
C
N
308
N
O
N
309
N
H
N
310
N
H
N
311
N
H
N
312
N
H
N
313
N
H
N
314
N
H
N
315
N
H
N
316
N
H
N
317
N
H
N
318
N
N
N
319
S
C
N
320
N
C
N
321
N
O
N
322
N
C
Y
323
N
C
Y
324
N
C
Y
325
N
C
Y
326
N
N
Y
327
N
C
Y
328
N
C
Y
329
N
C
Y
330
N
C
Y
331
N
C
N
332
N
O
N
333
N
H
N
334
N
H
N
335
N
H
N
336
N
H
N
337
N
H
N
338
N
H
N
339
N
H
N
340
N
H
N
341
N
H
N
342
N
H
N
343
N
H
N
344
N
H
N
345
N
N
N
346
S
C
N
347
N
C
N
348
N
O
N
349
N
C
Y
350
N
C
Y
351
N
C
Y
352
N
C
Y
353
N
C
Y
354
N
C
Y
355
N
C
N
356
N
O
N
357
N
O
N
358
N
H
N
359
N
H
N
360
N
H
N
361
N
H
N
362
N
H
N
363
N
H
N
364
N
H
N
365
N
H
N
366
N
H
N
367
N
H
N
368
N
H
N
369
N
N
N
370
S
C
N
371
N
C
N
372
N
O
N
373
N
C
N
374
N
C
N
375
N
C
N
376
N
O
N
377
N
H
N
378
N
H
N
379
N
H
N
380
N
H
N
381
N
H
N
382
N
H
N
383
N
H
N
384
N
H
N
385
N
H
N
386
N
H
N
387
N
H
N
1
N
sing
N
2
N
sing
N
3
N
sing
N
4
N
sing
N
5
N
sing
N
6
N
sing
N
7
N
doub
N
8
N
sing
N
9
N
sing
N
10
N
sing
N
11
N
sing
N
12
N
sing
N
13
N
sing
N
14
N
sing
N
15
N
sing
N
16
N
sing
N
17
N
sing
N
18
N
sing
N
19
N
doub
N
20
N
sing
N
21
N
sing
N
22
N
sing
N
23
N
sing
N
24
N
sing
N
25
N
sing
N
26
N
sing
N
27
N
sing
N
28
N
sing
N
29
N
sing
N
30
N
sing
N
31
N
sing
N
32
N
sing
N
33
N
doub
N
34
N
sing
N
35
N
sing
N
36
N
sing
N
37
N
sing
N
38
N
sing
N
39
N
sing
N
40
N
sing
N
41
N
sing
N
42
N
sing
N
43
N
sing
N
44
N
sing
N
45
N
doub
N
46
N
sing
N
47
N
sing
N
48
N
sing
N
49
N
sing
N
50
N
doub
N
51
N
sing
N
52
N
sing
N
53
N
sing
N
54
N
sing
N
55
N
sing
N
56
N
sing
N
57
N
sing
N
58
N
sing
N
59
N
sing
N
60
N
sing
N
61
N
doub
N
62
N
sing
N
63
N
sing
N
64
N
sing
N
65
N
sing
N
66
N
doub
N
67
N
sing
N
68
N
sing
N
69
N
sing
N
70
N
sing
N
71
N
sing
N
72
N
sing
N
73
N
sing
N
74
N
sing
N
75
N
sing
N
76
N
doub
N
77
N
sing
N
78
N
sing
N
79
N
sing
N
80
N
sing
N
81
N
sing
N
82
N
sing
N
83
N
sing
N
84
N
sing
N
85
N
sing
N
86
N
sing
N
87
N
sing
N
88
N
sing
N
89
N
doub
N
90
N
sing
N
91
N
sing
N
92
N
sing
N
93
N
sing
N
94
N
sing
N
95
N
sing
N
96
N
sing
N
97
N
doub
N
98
N
sing
N
99
N
sing
N
100
N
sing
N
101
N
sing
N
102
N
sing
N
103
N
sing
N
104
N
sing
N
105
N
sing
N
106
N
sing
N
107
N
sing
N
108
N
doub
N
109
N
sing
N
110
N
sing
N
111
N
sing
N
112
N
sing
N
113
N
sing
N
114
N
sing
N
115
N
sing
N
116
N
doub
N
117
N
sing
N
118
N
sing
N
119
N
sing
N
120
N
sing
N
121
N
sing
N
122
N
sing
N
123
N
sing
N
124
N
sing
N
125
N
sing
N
126
N
doub
N
127
N
sing
N
128
N
sing
N
129
N
sing
N
130
N
sing
N
131
N
sing
N
132
N
sing
N
133
N
sing
N
134
N
sing
N
135
N
doub
N
136
N
sing
N
137
N
sing
N
138
N
sing
N
139
N
sing
Y
140
N
sing
Y
141
N
doub
Y
142
N
doub
N
143
N
sing
Y
144
N
sing
N
145
N
sing
Y
146
N
sing
N
147
N
sing
N
148
N
sing
N
149
N
sing
N
150
N
sing
N
151
N
sing
N
152
N
sing
N
153
N
sing
N
154
N
sing
N
155
N
sing
N
156
N
doub
N
157
N
sing
N
158
N
sing
N
159
N
sing
N
160
N
sing
N
161
N
sing
N
162
N
sing
N
163
N
sing
N
164
N
sing
N
165
N
sing
N
166
N
sing
N
167
N
sing
N
168
N
sing
N
169
N
sing
N
170
N
sing
N
171
N
sing
N
172
N
sing
N
173
N
sing
N
174
N
sing
N
175
N
sing
N
176
N
sing
N
177
N
doub
N
178
N
sing
N
179
N
sing
N
180
N
sing
N
181
N
sing
N
182
N
sing
N
183
N
sing
N
184
N
sing
N
185
N
sing
N
186
N
sing
N
187
N
sing
N
188
N
sing
N
189
N
sing
N
190
N
sing
N
191
N
sing
N
192
N
sing
N
193
N
sing
N
194
N
sing
N
195
N
sing
N
196
N
sing
N
197
N
sing
N
198
N
doub
N
199
N
sing
N
200
N
sing
N
201
N
sing
N
202
N
sing
N
203
N
sing
N
204
N
sing
N
205
N
sing
N
206
N
sing
N
207
N
sing
N
208
N
sing
N
209
N
sing
N
210
N
sing
N
211
N
sing
N
212
N
sing
N
213
N
sing
N
214
N
sing
N
215
N
sing
N
216
N
sing
N
217
N
sing
N
218
N
sing
N
219
N
sing
N
220
N
sing
N
221
N
sing
N
222
N
doub
N
223
N
sing
N
224
N
sing
N
225
N
sing
N
226
N
sing
N
227
N
sing
N
228
N
sing
N
229
N
sing
N
230
N
sing
N
231
N
sing
N
232
N
sing
N
233
N
sing
N
234
N
sing
N
235
N
sing
N
236
N
sing
N
237
N
sing
N
238
N
sing
N
239
N
sing
N
240
N
sing
N
241
N
doub
N
242
N
sing
N
243
N
sing
N
244
N
sing
N
245
N
sing
Y
246
N
doub
Y
247
N
sing
Y
248
N
sing
N
249
N
sing
Y
250
N
doub
N
251
N
sing
Y
252
N
doub
N
253
N
sing
Y
254
N
sing
N
255
N
sing
N
256
N
sing
N
257
N
sing
N
258
N
sing
N
259
N
sing
N
260
N
sing
N
261
N
sing
N
262
N
sing
N
263
N
sing
N
264
N
doub
N
265
N
sing
N
266
N
sing
N
267
N
sing
N
268
N
sing
N
269
N
sing
N
270
N
sing
N
271
N
sing
N
272
N
sing
N
273
N
sing
N
274
N
sing
N
275
N
sing
N
276
N
sing
N
277
N
sing
N
278
N
sing
N
279
N
sing
N
280
N
sing
N
281
N
doub
N
282
N
sing
N
283
N
sing
N
284
N
sing
N
285
N
sing
N
286
N
sing
N
287
N
sing
N
288
N
sing
N
289
N
sing
N
290
N
sing
N
291
N
sing
N
292
N
sing
N
293
N
sing
N
294
N
doub
N
295
N
sing
N
296
N
sing
N
297
N
sing
N
298
N
sing
N
299
N
sing
N
300
N
sing
N
301
N
sing
N
302
N
sing
N
303
N
sing
N
304
N
sing
N
305
N
sing
N
306
N
sing
N
307
N
sing
N
308
N
sing
N
309
N
sing
N
310
N
doub
N
311
N
sing
N
312
N
sing
N
313
N
sing
N
314
N
sing
Y
315
N
doub
Y
316
N
sing
Y
317
N
sing
N
318
N
sing
Y
319
N
doub
Y
320
N
sing
Y
321
N
sing
N
322
N
sing
Y
323
N
sing
Y
324
N
doub
N
325
N
sing
Y
326
N
doub
N
327
N
sing
Y
328
N
sing
N
329
N
sing
N
330
N
sing
N
331
N
sing
N
332
N
sing
N
333
N
sing
N
334
N
sing
N
335
N
sing
N
336
N
sing
N
337
N
sing
N
338
N
doub
N
339
N
sing
N
340
N
sing
N
341
N
sing
N
342
N
sing
Y
343
N
doub
Y
344
N
sing
Y
345
N
sing
N
346
N
sing
Y
347
N
doub
N
348
N
sing
Y
349
N
doub
N
350
N
sing
Y
351
N
sing
N
352
N
sing
N
353
N
sing
N
354
N
sing
N
355
N
sing
N
356
N
sing
N
357
N
sing
N
358
N
sing
N
359
N
sing
N
360
N
sing
N
361
N
sing
N
362
N
doub
N
363
N
sing
N
364
N
sing
N
365
N
sing
N
366
N
sing
N
367
N
sing
N
368
N
sing
N
369
N
sing
N
370
N
sing
N
371
N
sing
N
372
N
sing
N
373
N
sing
Plenum Publishing Corporation New York
Structure and Function of Cholinesterases and Related Proteins
9999
-1
Quaternary Structure of Tetrameric Acetylcholinesterase
1998
UK
Protein Eng.
PRENE9
0859
0269-2139
10
677
685
10.1093/protein/10.6.677
9278281
Interactions underlying subunit association in cholinesterases.
1997
US
Science
SCIEAS
0038
0036-8075
253
872
879
10.1126/science.1678899
1678899
Atomic structure of acetylcholinesterase from Torpedo californica: a prototypic acetylcholine-binding protein.
1991
US
J.Biol.Chem.
JBCHA3
0071
0021-9258
263
9795
9800
3384821
Crystallization and preliminary X-ray diffraction analysis of 11 S acetylcholinesterase.
1988
10.2210/pdb1eea/pdb
pdb_00001eea
1.000000
0.000000
0.000000
0.000000
1.000000
0.000000
0.000000
0.000000
1.000000
0.00000
0.00000
0.00000
298.0
1
AREA DETECTOR
1987-01-15
XENTRONICS
SINGLE WAVELENGTH
M
x-ray
1
1.5418
1.0
1.5418
ROTATING ANODE
SEE REMARK 450 FOR INFORMATION REGARDING THE SOURCE AND SEQUENCE
60461.195
PROTEIN (ACETYLCHOLINESTERASE)
3.1.1.7
1
nat
polymer
no
no
DDHSELLVNTKSGKVMGTRVPVLSSHISAFLGIPFAEPPVGNMRFRRPEPKKPWSGVWNASTYPNNCQQYVDEQFPGFSG
SEMWNPNREMSEDCLYLNIWVPSPRPKSTTVMVWIYGGGFYSGSSTLDVYNGKYLAYTEEVVLVSLSYRVGAFGFLALHG
SQEAPGNVGLLDQRMALQWVHDNIQFFGGDPKTVTIFGESAGGASVGMHILSPGSRDLFRRAILQSGSPNCPWASVSVAE
GRRRAVELGRNLNCNLNSDEELIHCLREKKPQELIDVEWNVLPFDSIFRFSFVPVIDGEFFPTSLESMLNSGNFKKTQIL
LGVNKDEGSFFLLYGAPGFSKDSESKISREDFMSGVKLSVPHANDLGLDAVTLQYTDWMDDNNGIKNRDGLDDIVGDHNV
ICPLMHFVNKYTKFGNGTYLYFFNHRASNLVWPEWMGVIHGYEIEFVFGLPLVKELNYTAEEEALSRRIMHYWATFAKTG
NPNEPHSQESKWPLFTTKEQKFIDLNTEPMKVHQRLRVQMCVFWNQFLPKLLNA
DDHSELLVNTKSGKVMGTRVPVLSSHISAFLGIPFAEPPVGNMRFRRPEPKKPWSGVWNASTYPNNCQQYVDEQFPGFSG
SEMWNPNREMSEDCLYLNIWVPSPRPKSTTVMVWIYGGGFYSGSSTLDVYNGKYLAYTEEVVLVSLSYRVGAFGFLALHG
SQEAPGNVGLLDQRMALQWVHDNIQFFGGDPKTVTIFGESAGGASVGMHILSPGSRDLFRRAILQSGSPNCPWASVSVAE
GRRRAVELGRNLNCNLNSDEELIHCLREKKPQELIDVEWNVLPFDSIFRFSFVPVIDGEFFPTSLESMLNSGNFKKTQIL
LGVNKDEGSFFLLYGAPGFSKDSESKISREDFMSGVKLSVPHANDLGLDAVTLQYTDWMDDNNGIKNRDGLDDIVGDHNV
ICPLMHFVNKYTKFGNGTYLYFFNHRASNLVWPEWMGVIHGYEIEFVFGLPLVKELNYTAEEEALSRRIMHYWATFAKTG
NPNEPHSQESKWPLFTTKEQKFIDLNTEPMKVHQRLRVQMCVFWNQFLPKLLNA
A
polypeptide(L)
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
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n
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n
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n
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n
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n
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n
n
n
n
n
n
n
n
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n
n
n
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n
n
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n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
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n
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n
n
n
n
n
n
n
n
n
n
n
n
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n
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n
n
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n
n
n
n
n
n
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n
n
n
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n
n
n
n
n
n
n
n
n
n
n
n
n
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n
n
n
n
n
n
n
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n
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n
n
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n
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n
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n
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n
n
n
n
n
n
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n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
electric eel
Electrophorus
sample
8005
ELECTRIC ORGAN
Electrophorus electricus
G4 FORM
ELECTROPLAQUE
1
6.5
81.
8.0
pH 8.0
software
citation
citation_author
citation_editor
pdbx_struct_assembly
pdbx_struct_assembly_gen
pdbx_struct_assembly_prop
pdbx_struct_oper_list
struct_biol
chem_comp_atom
chem_comp_bond
database_2
pdbx_initial_refinement_model
repository
Initial release
Version format compliance
Version format compliance
Other
Refinement description
Data collection
Database references
Data collection
Derived calculations
Data collection
Database references
Refinement description
1
0
1999-02-01
1
1
2008-04-26
1
2
2011-07-13
1
3
2014-05-21
1
4
2017-10-04
1
5
2019-10-30
1
6
2019-12-18
1
7
2023-08-09
_citation.pdbx_database_id_DOI
_citation.pdbx_database_id_PubMed
_citation.title
_pdbx_struct_assembly.details
_pdbx_struct_assembly.method_details
_pdbx_struct_assembly.oligomeric_count
_pdbx_struct_assembly.oligomeric_details
_pdbx_struct_assembly_gen.oper_expression
_database_2.pdbx_DOI
_database_2.pdbx_database_accession
Y
RCSB
1999-01-26
REL
REL
THE SEQUENCE LISTED IN THE SEQRES RECORD
IS OF TORPEDO CALIFORNICA ACETYLCHOLINESTERASE,
(CORRESPONDING TO THE STRUCTURE)
NOT OF ELECTROPHORUS ELECTRICUS. AT THE RESOLUTION
OF THE EXPERIMENTAL DATA (4.5 A) NO SEQUENCE
DISCREPANCIES CAN BE SEEN
2ACE
PDB ENTRY 2ACE
PDB
experimental model
n
1
1
A
n
2
2
A
n
3
3
A
SER
4
n
4
SER
4
A
GLU
5
n
5
GLU
5
A
LEU
6
n
6
LEU
6
A
LEU
7
n
7
LEU
7
A
VAL
8
n
8
VAL
8
A
ASN
9
n
9
ASN
9
A
THR
10
n
10
THR
10
A
LYS
11
n
11
LYS
11
A
SER
12
n
12
SER
12
A
GLY
13
n
13
GLY
13
A
LYS
14
n
14
LYS
14
A
VAL
15
n
15
VAL
15
A
MET
16
n
16
MET
16
A
GLY
17
n
17
GLY
17
A
THR
18
n
18
THR
18
A
ARG
19
n
19
ARG
19
A
VAL
20
n
20
VAL
20
A
PRO
21
n
21
PRO
21
A
VAL
22
n
22
VAL
22
A
LEU
23
n
23
LEU
23
A
SER
24
n
24
SER
24
A
SER
25
n
25
SER
25
A
HIS
26
n
26
HIS
26
A
ILE
27
n
27
ILE
27
A
SER
28
n
28
SER
28
A
ALA
29
n
29
ALA
29
A
PHE
30
n
30
PHE
30
A
LEU
31
n
31
LEU
31
A
GLY
32
n
32
GLY
32
A
ILE
33
n
33
ILE
33
A
PRO
34
n
34
PRO
34
A
PHE
35
n
35
PHE
35
A
ALA
36
n
36
ALA
36
A
GLU
37
n
37
GLU
37
A
PRO
38
n
38
PRO
38
A
PRO
39
n
39
PRO
39
A
VAL
40
n
40
VAL
40
A
GLY
41
n
41
GLY
41
A
ASN
42
n
42
ASN
42
A
MET
43
n
43
MET
43
A
ARG
44
n
44
ARG
44
A
PHE
45
n
45
PHE
45
A
ARG
46
n
46
ARG
46
A
ARG
47
n
47
ARG
47
A
PRO
48
n
48
PRO
48
A
GLU
49
n
49
GLU
49
A
PRO
50
n
50
PRO
50
A
LYS
51
n
51
LYS
51
A
LYS
52
n
52
LYS
52
A
PRO
53
n
53
PRO
53
A
TRP
54
n
54
TRP
54
A
SER
55
n
55
SER
55
A
GLY
56
n
56
GLY
56
A
VAL
57
n
57
VAL
57
A
TRP
58
n
58
TRP
58
A
ASN
59
n
59
ASN
59
A
ALA
60
n
60
ALA
60
A
SER
61
n
61
SER
61
A
THR
62
n
62
THR
62
A
TYR
63
n
63
TYR
63
A
PRO
64
n
64
PRO
64
A
ASN
65
n
65
ASN
65
A
ASN
66
n
66
ASN
66
A
CYS
67
n
67
CYS
67
A
GLN
68
n
68
GLN
68
A
GLN
69
n
69
GLN
69
A
TYR
70
n
70
TYR
70
A
VAL
71
n
71
VAL
71
A
ASP
72
n
72
ASP
72
A
GLU
73
n
73
GLU
73
A
GLN
74
n
74
GLN
74
A
PHE
75
n
75
PHE
75
A
PRO
76
n
76
PRO
76
A
GLY
77
n
77
GLY
77
A
PHE
78
n
78
PHE
78
A
SER
79
n
79
SER
79
A
GLY
80
n
80
GLY
80
A
SER
81
n
81
SER
81
A
GLU
82
n
82
GLU
82
A
MET
83
n
83
MET
83
A
TRP
84
n
84
TRP
84
A
ASN
85
n
85
ASN
85
A
PRO
86
n
86
PRO
86
A
ASN
87
n
87
ASN
87
A
ARG
88
n
88
ARG
88
A
GLU
89
n
89
GLU
89
A
MET
90
n
90
MET
90
A
SER
91
n
91
SER
91
A
GLU
92
n
92
GLU
92
A
ASP
93
n
93
ASP
93
A
CYS
94
n
94
CYS
94
A
LEU
95
n
95
LEU
95
A
TYR
96
n
96
TYR
96
A
LEU
97
n
97
LEU
97
A
ASN
98
n
98
ASN
98
A
ILE
99
n
99
ILE
99
A
TRP
100
n
100
TRP
100
A
VAL
101
n
101
VAL
101
A
PRO
102
n
102
PRO
102
A
SER
103
n
103
SER
103
A
PRO
104
n
104
PRO
104
A
ARG
105
n
105
ARG
105
A
PRO
106
n
106
PRO
106
A
LYS
107
n
107
LYS
107
A
SER
108
n
108
SER
108
A
THR
109
n
109
THR
109
A
THR
110
n
110
THR
110
A
VAL
111
n
111
VAL
111
A
MET
112
n
112
MET
112
A
VAL
113
n
113
VAL
113
A
TRP
114
n
114
TRP
114
A
ILE
115
n
115
ILE
115
A
TYR
116
n
116
TYR
116
A
GLY
117
n
117
GLY
117
A
GLY
118
n
118
GLY
118
A
GLY
119
n
119
GLY
119
A
PHE
120
n
120
PHE
120
A
TYR
121
n
121
TYR
121
A
SER
122
n
122
SER
122
A
GLY
123
n
123
GLY
123
A
SER
124
n
124
SER
124
A
SER
125
n
125
SER
125
A
THR
126
n
126
THR
126
A
LEU
127
n
127
LEU
127
A
ASP
128
n
128
ASP
128
A
VAL
129
n
129
VAL
129
A
TYR
130
n
130
TYR
130
A
ASN
131
n
131
ASN
131
A
GLY
132
n
132
GLY
132
A
LYS
133
n
133
LYS
133
A
TYR
134
n
134
TYR
134
A
LEU
135
n
135
LEU
135
A
ALA
136
n
136
ALA
136
A
TYR
137
n
137
TYR
137
A
THR
138
n
138
THR
138
A
GLU
139
n
139
GLU
139
A
GLU
140
n
140
GLU
140
A
VAL
141
n
141
VAL
141
A
VAL
142
n
142
VAL
142
A
LEU
143
n
143
LEU
143
A
VAL
144
n
144
VAL
144
A
SER
145
n
145
SER
145
A
LEU
146
n
146
LEU
146
A
SER
147
n
147
SER
147
A
TYR
148
n
148
TYR
148
A
ARG
149
n
149
ARG
149
A
VAL
150
n
150
VAL
150
A
GLY
151
n
151
GLY
151
A
ALA
152
n
152
ALA
152
A
PHE
153
n
153
PHE
153
A
GLY
154
n
154
GLY
154
A
PHE
155
n
155
PHE
155
A
LEU
156
n
156
LEU
156
A
ALA
157
n
157
ALA
157
A
LEU
158
n
158
LEU
158
A
HIS
159
n
159
HIS
159
A
GLY
160
n
160
GLY
160
A
SER
161
n
161
SER
161
A
GLN
162
n
162
GLN
162
A
GLU
163
n
163
GLU
163
A
ALA
164
n
164
ALA
164
A
PRO
165
n
165
PRO
165
A
GLY
166
n
166
GLY
166
A
ASN
167
n
167
ASN
167
A
VAL
168
n
168
VAL
168
A
GLY
169
n
169
GLY
169
A
LEU
170
n
170
LEU
170
A
LEU
171
n
171
LEU
171
A
ASP
172
n
172
ASP
172
A
GLN
173
n
173
GLN
173
A
ARG
174
n
174
ARG
174
A
MET
175
n
175
MET
175
A
ALA
176
n
176
ALA
176
A
LEU
177
n
177
LEU
177
A
GLN
178
n
178
GLN
178
A
TRP
179
n
179
TRP
179
A
VAL
180
n
180
VAL
180
A
HIS
181
n
181
HIS
181
A
ASP
182
n
182
ASP
182
A
ASN
183
n
183
ASN
183
A
ILE
184
n
184
ILE
184
A
GLN
185
n
185
GLN
185
A
PHE
186
n
186
PHE
186
A
PHE
187
n
187
PHE
187
A
GLY
188
n
188
GLY
188
A
GLY
189
n
189
GLY
189
A
ASP
190
n
190
ASP
190
A
PRO
191
n
191
PRO
191
A
LYS
192
n
192
LYS
192
A
THR
193
n
193
THR
193
A
VAL
194
n
194
VAL
194
A
THR
195
n
195
THR
195
A
ILE
196
n
196
ILE
196
A
PHE
197
n
197
PHE
197
A
GLY
198
n
198
GLY
198
A
GLU
199
n
199
GLU
199
A
SER
200
n
200
SER
200
A
ALA
201
n
201
ALA
201
A
GLY
202
n
202
GLY
202
A
GLY
203
n
203
GLY
203
A
ALA
204
n
204
ALA
204
A
SER
205
n
205
SER
205
A
VAL
206
n
206
VAL
206
A
GLY
207
n
207
GLY
207
A
MET
208
n
208
MET
208
A
HIS
209
n
209
HIS
209
A
ILE
210
n
210
ILE
210
A
LEU
211
n
211
LEU
211
A
SER
212
n
212
SER
212
A
PRO
213
n
213
PRO
213
A
GLY
214
n
214
GLY
214
A
SER
215
n
215
SER
215
A
ARG
216
n
216
ARG
216
A
ASP
217
n
217
ASP
217
A
LEU
218
n
218
LEU
218
A
PHE
219
n
219
PHE
219
A
ARG
220
n
220
ARG
220
A
ARG
221
n
221
ARG
221
A
ALA
222
n
222
ALA
222
A
ILE
223
n
223
ILE
223
A
LEU
224
n
224
LEU
224
A
GLN
225
n
225
GLN
225
A
SER
226
n
226
SER
226
A
GLY
227
n
227
GLY
227
A
SER
228
n
228
SER
228
A
PRO
229
n
229
PRO
229
A
ASN
230
n
230
ASN
230
A
CYS
231
n
231
CYS
231
A
PRO
232
n
232
PRO
232
A
TRP
233
n
233
TRP
233
A
ALA
234
n
234
ALA
234
A
SER
235
n
235
SER
235
A
VAL
236
n
236
VAL
236
A
SER
237
n
237
SER
237
A
VAL
238
n
238
VAL
238
A
ALA
239
n
239
ALA
239
A
GLU
240
n
240
GLU
240
A
GLY
241
n
241
GLY
241
A
ARG
242
n
242
ARG
242
A
ARG
243
n
243
ARG
243
A
ARG
244
n
244
ARG
244
A
ALA
245
n
245
ALA
245
A
VAL
246
n
246
VAL
246
A
GLU
247
n
247
GLU
247
A
LEU
248
n
248
LEU
248
A
GLY
249
n
249
GLY
249
A
ARG
250
n
250
ARG
250
A
ASN
251
n
251
ASN
251
A
LEU
252
n
252
LEU
252
A
ASN
253
n
253
ASN
253
A
CYS
254
n
254
CYS
254
A
ASN
255
n
255
ASN
255
A
LEU
256
n
256
LEU
256
A
ASN
257
n
257
ASN
257
A
SER
258
n
258
SER
258
A
ASP
259
n
259
ASP
259
A
GLU
260
n
260
GLU
260
A
GLU
261
n
261
GLU
261
A
LEU
262
n
262
LEU
262
A
ILE
263
n
263
ILE
263
A
HIS
264
n
264
HIS
264
A
CYS
265
n
265
CYS
265
A
LEU
266
n
266
LEU
266
A
ARG
267
n
267
ARG
267
A
GLU
268
n
268
GLU
268
A
LYS
269
n
269
LYS
269
A
LYS
270
n
270
LYS
270
A
PRO
271
n
271
PRO
271
A
GLN
272
n
272
GLN
272
A
GLU
273
n
273
GLU
273
A
LEU
274
n
274
LEU
274
A
ILE
275
n
275
ILE
275
A
ASP
276
n
276
ASP
276
A
VAL
277
n
277
VAL
277
A
GLU
278
n
278
GLU
278
A
TRP
279
n
279
TRP
279
A
ASN
280
n
280
ASN
280
A
VAL
281
n
281
VAL
281
A
LEU
282
n
282
LEU
282
A
PRO
283
n
283
PRO
283
A
PHE
284
n
284
PHE
284
A
ASP
285
n
285
ASP
285
A
SER
286
n
286
SER
286
A
ILE
287
n
287
ILE
287
A
PHE
288
n
288
PHE
288
A
ARG
289
n
289
ARG
289
A
PHE
290
n
290
PHE
290
A
SER
291
n
291
SER
291
A
PHE
292
n
292
PHE
292
A
VAL
293
n
293
VAL
293
A
PRO
294
n
294
PRO
294
A
VAL
295
n
295
VAL
295
A
ILE
296
n
296
ILE
296
A
ASP
297
n
297
ASP
297
A
GLY
298
n
298
GLY
298
A
GLU
299
n
299
GLU
299
A
PHE
300
n
300
PHE
300
A
PHE
301
n
301
PHE
301
A
PRO
302
n
302
PRO
302
A
THR
303
n
303
THR
303
A
SER
304
n
304
SER
304
A
LEU
305
n
305
LEU
305
A
GLU
306
n
306
GLU
306
A
SER
307
n
307
SER
307
A
MET
308
n
308
MET
308
A
LEU
309
n
309
LEU
309
A
ASN
310
n
310
ASN
310
A
SER
311
n
311
SER
311
A
GLY
312
n
312
GLY
312
A
ASN
313
n
313
ASN
313
A
PHE
314
n
314
PHE
314
A
LYS
315
n
315
LYS
315
A
LYS
316
n
316
LYS
316
A
THR
317
n
317
THR
317
A
GLN
318
n
318
GLN
318
A
ILE
319
n
319
ILE
319
A
LEU
320
n
320
LEU
320
A
LEU
321
n
321
LEU
321
A
GLY
322
n
322
GLY
322
A
VAL
323
n
323
VAL
323
A
ASN
324
n
324
ASN
324
A
LYS
325
n
325
LYS
325
A
ASP
326
n
326
ASP
326
A
GLU
327
n
327
GLU
327
A
GLY
328
n
328
GLY
328
A
SER
329
n
329
SER
329
A
PHE
330
n
330
PHE
330
A
PHE
331
n
331
PHE
331
A
LEU
332
n
332
LEU
332
A
LEU
333
n
333
LEU
333
A
TYR
334
n
334
TYR
334
A
GLY
335
n
335
GLY
335
A
ALA
336
n
336
ALA
336
A
PRO
337
n
337
PRO
337
A
GLY
338
n
338
GLY
338
A
PHE
339
n
339
PHE
339
A
SER
340
n
340
SER
340
A
LYS
341
n
341
LYS
341
A
ASP
342
n
342
ASP
342
A
SER
343
n
343
SER
343
A
GLU
344
n
344
GLU
344
A
SER
345
n
345
SER
345
A
LYS
346
n
346
LYS
346
A
ILE
347
n
347
ILE
347
A
SER
348
n
348
SER
348
A
ARG
349
n
349
ARG
349
A
GLU
350
n
350
GLU
350
A
ASP
351
n
351
ASP
351
A
PHE
352
n
352
PHE
352
A
MET
353
n
353
MET
353
A
SER
354
n
354
SER
354
A
GLY
355
n
355
GLY
355
A
VAL
356
n
356
VAL
356
A
LYS
357
n
357
LYS
357
A
LEU
358
n
358
LEU
358
A
SER
359
n
359
SER
359
A
VAL
360
n
360
VAL
360
A
PRO
361
n
361
PRO
361
A
HIS
362
n
362
HIS
362
A
ALA
363
n
363
ALA
363
A
ASN
364
n
364
ASN
364
A
ASP
365
n
365
ASP
365
A
LEU
366
n
366
LEU
366
A
GLY
367
n
367
GLY
367
A
LEU
368
n
368
LEU
368
A
ASP
369
n
369
ASP
369
A
ALA
370
n
370
ALA
370
A
VAL
371
n
371
VAL
371
A
THR
372
n
372
THR
372
A
LEU
373
n
373
LEU
373
A
GLN
374
n
374
GLN
374
A
TYR
375
n
375
TYR
375
A
THR
376
n
376
THR
376
A
ASP
377
n
377
ASP
377
A
TRP
378
n
378
TRP
378
A
MET
379
n
379
MET
379
A
ASP
380
n
380
ASP
380
A
ASP
381
n
381
ASP
381
A
ASN
382
n
382
ASN
382
A
ASN
383
n
383
ASN
383
A
GLY
384
n
384
GLY
384
A
ILE
385
n
385
ILE
385
A
LYS
386
n
386
LYS
386
A
ASN
387
n
387
ASN
387
A
ARG
388
n
388
ARG
388
A
ASP
389
n
389
ASP
389
A
GLY
390
n
390
GLY
390
A
LEU
391
n
391
LEU
391
A
ASP
392
n
392
ASP
392
A
ASP
393
n
393
ASP
393
A
ILE
394
n
394
ILE
394
A
VAL
395
n
395
VAL
395
A
GLY
396
n
396
GLY
396
A
ASP
397
n
397
ASP
397
A
HIS
398
n
398
HIS
398
A
ASN
399
n
399
ASN
399
A
VAL
400
n
400
VAL
400
A
ILE
401
n
401
ILE
401
A
CYS
402
n
402
CYS
402
A
PRO
403
n
403
PRO
403
A
LEU
404
n
404
LEU
404
A
MET
405
n
405
MET
405
A
HIS
406
n
406
HIS
406
A
PHE
407
n
407
PHE
407
A
VAL
408
n
408
VAL
408
A
ASN
409
n
409
ASN
409
A
LYS
410
n
410
LYS
410
A
TYR
411
n
411
TYR
411
A
THR
412
n
412
THR
412
A
LYS
413
n
413
LYS
413
A
PHE
414
n
414
PHE
414
A
GLY
415
n
415
GLY
415
A
ASN
416
n
416
ASN
416
A
GLY
417
n
417
GLY
417
A
THR
418
n
418
THR
418
A
TYR
419
n
419
TYR
419
A
LEU
420
n
420
LEU
420
A
TYR
421
n
421
TYR
421
A
PHE
422
n
422
PHE
422
A
PHE
423
n
423
PHE
423
A
ASN
424
n
424
ASN
424
A
HIS
425
n
425
HIS
425
A
ARG
426
n
426
ARG
426
A
ALA
427
n
427
ALA
427
A
SER
428
n
428
SER
428
A
ASN
429
n
429
ASN
429
A
LEU
430
n
430
LEU
430
A
VAL
431
n
431
VAL
431
A
TRP
432
n
432
TRP
432
A
PRO
433
n
433
PRO
433
A
GLU
434
n
434
GLU
434
A
TRP
435
n
435
TRP
435
A
MET
436
n
436
MET
436
A
GLY
437
n
437
GLY
437
A
VAL
438
n
438
VAL
438
A
ILE
439
n
439
ILE
439
A
HIS
440
n
440
HIS
440
A
GLY
441
n
441
GLY
441
A
TYR
442
n
442
TYR
442
A
GLU
443
n
443
GLU
443
A
ILE
444
n
444
ILE
444
A
GLU
445
n
445
GLU
445
A
PHE
446
n
446
PHE
446
A
VAL
447
n
447
VAL
447
A
PHE
448
n
448
PHE
448
A
GLY
449
n
449
GLY
449
A
LEU
450
n
450
LEU
450
A
PRO
451
n
451
PRO
451
A
LEU
452
n
452
LEU
452
A
VAL
453
n
453
VAL
453
A
LYS
454
n
454
LYS
454
A
GLU
455
n
455
GLU
455
A
LEU
456
n
456
LEU
456
A
ASN
457
n
457
ASN
457
A
TYR
458
n
458
TYR
458
A
THR
459
n
459
THR
459
A
ALA
460
n
460
ALA
460
A
GLU
461
n
461
GLU
461
A
GLU
462
n
462
GLU
462
A
GLU
463
n
463
GLU
463
A
ALA
464
n
464
ALA
464
A
LEU
465
n
465
LEU
465
A
SER
466
n
466
SER
466
A
ARG
467
n
467
ARG
467
A
ARG
468
n
468
ARG
468
A
ILE
469
n
469
ILE
469
A
MET
470
n
470
MET
470
A
HIS
471
n
471
HIS
471
A
TYR
472
n
472
TYR
472
A
TRP
473
n
473
TRP
473
A
ALA
474
n
474
ALA
474
A
THR
475
n
475
THR
475
A
PHE
476
n
476
PHE
476
A
ALA
477
n
477
ALA
477
A
LYS
478
n
478
LYS
478
A
THR
479
n
479
THR
479
A
GLY
480
n
480
GLY
480
A
ASN
481
n
481
ASN
481
A
PRO
482
n
482
PRO
482
A
ASN
483
n
483
ASN
483
A
GLU
484
n
484
GLU
484
A
n
485
485
A
n
486
486
A
n
487
487
A
n
488
488
A
n
489
489
A
SER
490
n
490
SER
490
A
LYS
491
n
491
LYS
491
A
TRP
492
n
492
TRP
492
A
PRO
493
n
493
PRO
493
A
LEU
494
n
494
LEU
494
A
PHE
495
n
495
PHE
495
A
THR
496
n
496
THR
496
A
THR
497
n
497
THR
497
A
LYS
498
n
498
LYS
498
A
GLU
499
n
499
GLU
499
A
GLN
500
n
500
GLN
500
A
LYS
501
n
501
LYS
501
A
PHE
502
n
502
PHE
502
A
ILE
503
n
503
ILE
503
A
ASP
504
n
504
ASP
504
A
LEU
505
n
505
LEU
505
A
ASN
506
n
506
ASN
506
A
THR
507
n
507
THR
507
A
GLU
508
n
508
GLU
508
A
PRO
509
n
509
PRO
509
A
MET
510
n
510
MET
510
A
LYS
511
n
511
LYS
511
A
VAL
512
n
512
VAL
512
A
HIS
513
n
513
HIS
513
A
GLN
514
n
514
GLN
514
A
ARG
515
n
515
ARG
515
A
LEU
516
n
516
LEU
516
A
ARG
517
n
517
ARG
517
A
VAL
518
n
518
VAL
518
A
GLN
519
n
519
GLN
519
A
MET
520
n
520
MET
520
A
CYS
521
n
521
CYS
521
A
VAL
522
n
522
VAL
522
A
PHE
523
n
523
PHE
523
A
TRP
524
n
524
TRP
524
A
ASN
525
n
525
ASN
525
A
GLN
526
n
526
GLN
526
A
PHE
527
n
527
PHE
527
A
LEU
528
n
528
LEU
528
A
PRO
529
n
529
PRO
529
A
LYS
530
n
530
LYS
530
A
LEU
531
n
531
LEU
531
A
LEU
532
n
532
LEU
532
A
ASN
533
n
533
ASN
533
A
ALA
534
n
534
ALA
534
A
software_defined_assembly
PISA
2
dimeric
1740
-17
36470
1.0000000000
0.0000000000
0.0000000000
0.0000000000
1.0000000000
0.0000000000
0.0000000000
0.0000000000
1.0000000000
1_555
x,y,z
identity operation
0.0000000000
0.0000000000
0.0000000000
-1.0000000000
0.0000000000
0.0000000000
0.0000000000
-1.0000000000
0.0000000000
0.0000000000
0.0000000000
1.0000000000
2_555
-x,-y,z
crystal symmetry operation
0.0000000000
0.0000000000
0.0000000000
A
O
VAL
8
A
O
VAL
8
A
N
VAL
15
A
N
VAL
15
A
O
LYS
14
A
O
LYS
14
A
N
TRP
58
A
N
TRP
58
A
O
THR
18
A
O
THR
18
A
N
ALA
29
A
N
ALA
29
A
O
SER
28
A
O
SER
28
A
N
VAL
101
A
N
VAL
101
A
O
ASN
98
A
O
ASN
98
A
N
SER
145
A
N
SER
145
A
O
VAL
142
A
O
VAL
142
A
N
MET
112
A
N
MET
112
A
O
VAL
111
A
O
VAL
111
A
N
THR
195
A
N
THR
195
A
O
ILE
196
A
O
ILE
196
A
N
ARG
221
A
N
ARG
221
A
O
ALA
222
A
O
ALA
222
A
N
LEU
320
A
N
LEU
320
A
O
ILE
319
A
O
ILE
319
A
N
TYR
419
A
N
TYR
419
A
O
PHE
422
A
O
PHE
422
A
N
ILE
503
A
N
ILE
503
A
O
PHE
502
A
O
PHE
502
A
N
HIS
513
A
N
HIS
513
A
O
VAL
236
A
O
VAL
236
A
N
PRO
294
A
N
PRO
294
1
A
CG
HIS
26
A
CG
HIS
26
1
Y
1
A
ND1
HIS
26
A
ND1
HIS
26
1
Y
1
A
CD2
HIS
26
A
CD2
HIS
26
1
Y
1
A
CE1
HIS
26
A
CE1
HIS
26
1
Y
1
A
NE2
HIS
26
A
NE2
HIS
26
1
Y
1
A
CG
ASN
42
A
CG
ASN
42
1
Y
1
A
OD1
ASN
42
A
OD1
ASN
42
1
Y
1
A
ND2
ASN
42
A
ND2
ASN
42
1
Y
1
A
CD
ARG
47
A
CD
ARG
47
1
Y
1
A
NE
ARG
47
A
NE
ARG
47
1
Y
1
A
CZ
ARG
47
A
CZ
ARG
47
1
Y
1
A
NH1
ARG
47
A
NH1
ARG
47
1
Y
1
A
NH2
ARG
47
A
NH2
ARG
47
1
Y
1
A
CD
GLU
49
A
CD
GLU
49
1
Y
1
A
OE1
GLU
49
A
OE1
GLU
49
1
Y
1
A
OE2
GLU
49
A
OE2
GLU
49
1
Y
1
A
CZ
ARG
88
A
CZ
ARG
88
1
Y
1
A
NH1
ARG
88
A
NH1
ARG
88
1
Y
1
A
NH2
ARG
88
A
NH2
ARG
88
1
Y
1
A
CD
GLU
89
A
CD
GLU
89
1
Y
1
A
OE1
GLU
89
A
OE1
GLU
89
1
Y
1
A
OE2
GLU
89
A
OE2
GLU
89
1
Y
1
A
CG
ASN
257
A
CG
ASN
257
1
Y
1
A
OD1
ASN
257
A
OD1
ASN
257
1
Y
1
A
ND2
ASN
257
A
ND2
ASN
257
1
Y
1
A
CG
GLU
260
A
CG
GLU
260
1
Y
1
A
CD
GLU
260
A
CD
GLU
260
1
Y
1
A
OE1
GLU
260
A
OE1
GLU
260
1
Y
1
A
OE2
GLU
260
A
OE2
GLU
260
1
Y
1
A
CD
GLU
268
A
CD
GLU
268
1
Y
1
A
OE1
GLU
268
A
OE1
GLU
268
1
Y
1
A
OE2
GLU
268
A
OE2
GLU
268
1
Y
1
A
CD
LYS
270
A
CD
LYS
270
1
Y
1
A
CE
LYS
270
A
CE
LYS
270
1
Y
1
A
NZ
LYS
270
A
NZ
LYS
270
1
Y
1
A
CD
GLU
299
A
CD
GLU
299
1
Y
1
A
OE1
GLU
299
A
OE1
GLU
299
1
Y
1
A
OE2
GLU
299
A
OE2
GLU
299
1
Y
1
A
NZ
LYS
325
A
NZ
LYS
325
1
Y
1
A
CD
GLU
344
A
CD
GLU
344
1
Y
1
A
OE1
GLU
344
A
OE1
GLU
344
1
Y
1
A
OE2
GLU
344
A
OE2
GLU
344
1
Y
1
A
CD
GLU
350
A
CD
GLU
350
1
Y
1
A
OE1
GLU
350
A
OE1
GLU
350
1
Y
1
A
OE2
GLU
350
A
OE2
GLU
350
1
Y
1
A
SD
MET
353
A
SD
MET
353
1
Y
1
A
CE
MET
353
A
CE
MET
353
1
Y
1
A
CG
ASP
365
A
CG
ASP
365
1
Y
1
A
OD1
ASP
365
A
OD1
ASP
365
1
Y
1
A
OD2
ASP
365
A
OD2
ASP
365
1
Y
1
A
CG
ASN
382
A
CG
ASN
382
1
Y
1
A
OD1
ASN
382
A
OD1
ASN
382
1
Y
1
A
ND2
ASN
382
A
ND2
ASN
382
1
Y
1
A
CD
GLU
434
A
CD
GLU
434
1
Y
1
A
OE1
GLU
434
A
OE1
GLU
434
1
Y
1
A
OE2
GLU
434
A
OE2
GLU
434
1
Y
1
A
CD
GLU
455
A
CD
GLU
455
1
Y
1
A
OE1
GLU
455
A
OE1
GLU
455
1
Y
1
A
OE2
GLU
455
A
OE2
GLU
455
1
Y
1
A
CD
GLU
461
A
CD
GLU
461
1
Y
1
A
OE1
GLU
461
A
OE1
GLU
461
1
Y
1
A
OE2
GLU
461
A
OE2
GLU
461
1
Y
1
A
CD
GLU
484
A
CD
GLU
484
1
Y
1
A
OE1
GLU
484
A
OE1
GLU
484
1
Y
1
A
OE2
GLU
484
A
OE2
GLU
484
1
Y
1
A
NZ
LYS
498
A
NZ
LYS
498
1
Y
1
A
CD
GLU
499
A
CD
GLU
499
1
Y
1
A
OE1
GLU
499
A
OE1
GLU
499
1
Y
1
A
OE2
GLU
499
A
OE2
GLU
499
1
Y
1
A
CD
GLU
508
A
CD
GLU
508
1
Y
1
A
OE1
GLU
508
A
OE1
GLU
508
1
Y
1
A
OE2
GLU
508
A
OE2
GLU
508
1
Y
1
A
CZ
ARG
515
A
CZ
ARG
515
1
Y
1
A
NH1
ARG
515
A
NH1
ARG
515
1
Y
1
A
NH2
ARG
515
A
NH2
ARG
515
1
Y
1
A
CD
GLN
526
A
CD
GLN
526
1
Y
1
A
OE1
GLN
526
A
OE1
GLN
526
1
Y
1
A
NE2
GLN
526
A
NE2
GLN
526
1
Y
1
A
CG
ASN
533
A
CG
ASN
533
1
Y
1
A
OD1
ASN
533
A
OD1
ASN
533
1
Y
1
A
ND2
ASN
533
A
ND2
ASN
533
1
Y
1
A
ASP
1
A
ASP
1
1
Y
1
A
ASP
2
A
ASP
2
1
Y
1
A
HIS
3
A
HIS
3
1
Y
1
A
PRO
485
A
PRO
485
1
Y
1
A
HIS
486
A
HIS
486
1
Y
1
A
SER
487
A
SER
487
1
Y
1
A
GLN
488
A
GLN
488
1
Y
1
A
GLU
489
A
GLU
489
1
Y
1
A
A
NH2
OD1
ARG
ASN
289
399
2.19
1
14.76
1.70
113.30
128.06
A
A
A
CA
CB
CG
MET
MET
MET
16
16
16
N
1
3.92
0.50
120.30
124.22
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
46
46
46
N
1
6.91
0.90
118.30
125.21
A
A
A
CB
CG
OD1
ASP
ASP
ASP
72
72
72
N
1
14.02
2.20
113.40
127.42
A
A
A
CA
CB
CG
ASN
ASN
ASN
85
85
85
N
1
11.46
1.90
110.20
121.66
A
A
A
CB
CA
C
LEU
LEU
LEU
97
97
97
N
1
21.20
2.30
115.30
136.50
A
A
A
CA
CB
CG
LEU
LEU
LEU
97
97
97
N
1
3.79
0.50
120.30
124.09
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
105
105
105
N
1
9.67
1.60
122.70
132.37
A
A
A
O
C
N
VAL
VAL
TYR
129
129
130
Y
1
3.84
0.60
121.00
124.84
A
A
A
CB
CG
CD1
TYR
TYR
TYR
137
137
137
N
1
9.54
1.50
110.90
120.44
A
A
A
CA
CB
CG2
VAL
VAL
VAL
144
144
144
N
1
9.01
1.50
110.50
119.51
A
A
A
N
CA
CB
SER
SER
SER
147
147
147
N
1
25.46
2.50
121.70
147.16
A
A
A
C
N
CA
GLY
ASN
ASN
166
167
167
Y
1
13.34
1.90
111.40
124.74
A
A
A
CB
CA
C
VAL
VAL
VAL
168
168
168
N
1
12.46
1.50
110.90
123.36
A
A
A
CA
CB
CG1
VAL
VAL
VAL
168
168
168
N
1
13.95
1.90
110.20
124.15
A
A
A
CB
CA
C
LEU
LEU
LEU
170
170
170
N
1
14.00
2.30
115.30
129.30
A
A
A
CA
CB
CG
LEU
LEU
LEU
170
170
170
N
1
7.70
0.90
118.30
126.00
A
A
A
CB
CG
OD1
ASP
ASP
ASP
172
172
172
N
1
-9.78
1.40
123.60
113.82
A
A
A
CD
NE
CZ
ARG
ARG
ARG
174
174
174
N
1
-5.52
0.50
120.30
114.78
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
174
174
174
N
1
10.65
1.60
122.70
133.35
A
A
A
O
C
N
VAL
VAL
THR
194
194
195
Y
1
9.73
1.50
110.10
119.83
A
A
A
CB
CA
C
ALA
ALA
ALA
201
201
201
N
1
18.05
1.40
123.60
141.65
A
A
A
CD
NE
CZ
ARG
ARG
ARG
216
216
216
N
1
11.93
0.50
120.30
132.23
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
216
216
216
N
1
-5.87
0.50
120.30
114.43
A
A
A
NE
CZ
NH2
ARG
ARG
ARG
216
216
216
N
1
6.43
0.90
118.30
124.73
A
A
A
CB
CG
OD1
ASP
ASP
ASP
217
217
217
N
1
15.28
2.20
113.40
128.68
A
A
A
CA
CB
CG
ARG
ARG
ARG
220
220
220
N
1
3.90
0.50
120.30
124.20
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
220
220
220
N
1
-3.67
0.50
120.30
116.63
A
A
A
NE
CZ
NH2
ARG
ARG
ARG
220
220
220
N
1
-3.09
0.50
120.30
117.21
A
A
A
NE
CZ
NH2
ARG
ARG
ARG
221
221
221
N
1
13.27
1.90
110.10
123.37
A
A
A
CB
CA
C
SER
SER
SER
228
228
228
N
1
-10.83
1.40
123.60
112.77
A
A
A
CD
NE
CZ
ARG
ARG
ARG
242
242
242
N
1
-3.74
0.50
120.30
116.56
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
242
242
242
N
1
-7.75
0.50
120.30
112.55
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
243
243
243
N
1
7.52
0.50
120.30
127.82
A
A
A
NE
CZ
NH2
ARG
ARG
ARG
243
243
243
N
1
7.35
0.50
120.30
127.65
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
244
244
244
N
1
-7.10
0.50
120.30
113.20
A
A
A
NE
CZ
NH2
ARG
ARG
ARG
244
244
244
N
1
6.93
0.90
118.30
125.23
A
A
A
CB
CG
OD1
ASP
ASP
ASP
259
259
259
N
1
17.84
1.40
123.60
141.44
A
A
A
CD
NE
CZ
ARG
ARG
ARG
267
267
267
N
1
6.68
0.50
120.30
126.98
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
267
267
267
N
1
12.91
1.20
123.30
136.21
A
A
A
OE1
CD
OE2
GLU
GLU
GLU
273
273
273
N
1
15.93
2.30
115.30
131.23
A
A
A
CA
CB
CG
LEU
LEU
LEU
282
282
282
N
1
18.97
2.00
110.40
129.37
A
A
A
CB
CA
C
ASP
ASP
ASP
285
285
285
N
1
-16.86
2.70
111.00
94.14
A
A
A
N
CA
C
ASP
ASP
ASP
285
285
285
N
1
14.59
2.00
110.40
124.99
A
A
A
CB
CA
C
ARG
ARG
ARG
289
289
289
N
1
6.38
0.50
120.30
126.68
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
289
289
289
N
1
-5.77
0.50
120.30
114.53
A
A
A
NE
CZ
NH2
ARG
ARG
ARG
289
289
289
N
1
12.01
2.00
110.40
122.41
A
A
A
CB
CA
C
PHE
PHE
PHE
290
290
290
N
1
14.83
1.90
111.40
126.23
A
A
A
CB
CA
C
VAL
VAL
VAL
293
293
293
N
1
-21.80
2.20
111.50
89.70
A
A
A
N
CA
CB
VAL
VAL
VAL
293
293
293
N
1
16.63
2.30
115.30
131.93
A
A
A
CA
CB
CG
LEU
LEU
LEU
305
305
305
N
1
10.20
1.60
100.20
110.40
A
A
A
CG
SD
CE
MET
MET
MET
308
308
308
N
1
-14.85
2.20
111.50
96.65
A
A
A
N
CA
CB
VAL
VAL
VAL
323
323
323
N
1
-8.44
0.90
118.30
109.86
A
A
A
CB
CG
OD1
ASP
ASP
ASP
326
326
326
N
1
5.61
0.90
118.30
123.91
A
A
A
CB
CG
OD2
ASP
ASP
ASP
326
326
326
N
1
-6.10
0.90
118.30
112.20
A
A
A
CB
CG
OD1
ASP
ASP
ASP
351
351
351
N
1
12.39
1.90
110.20
122.59
A
A
A
CB
CA
C
LEU
LEU
LEU
368
368
368
N
1
4.87
0.50
120.30
125.17
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
388
388
388
N
1
16.42
1.90
110.20
126.62
A
A
A
CB
CA
C
LEU
LEU
LEU
391
391
391
N
1
14.05
2.30
115.30
129.35
A
A
A
CA
CB
CG
LEU
LEU
LEU
391
391
391
N
1
-9.24
0.90
118.30
109.06
A
A
A
CB
CG
OD1
ASP
ASP
ASP
392
392
392
N
1
7.91
1.20
111.50
119.41
A
A
A
CB
CA
C
CYS
CYS
CYS
402
402
402
N
1
10.83
1.80
110.60
121.43
A
A
A
N
CA
CB
LYS
LYS
LYS
413
413
413
N
1
12.34
1.40
123.60
135.94
A
A
A
CD
NE
CZ
ARG
ARG
ARG
426
426
426
N
1
-3.85
0.50
120.30
116.45
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
426
426
426
N
1
22.75
2.20
113.40
136.15
A
A
A
CA
CB
CG
GLU
GLU
GLU
434
434
434
N
1
12.39
2.00
110.40
122.79
A
A
A
CB
CA
C
MET
MET
MET
436
436
436
N
1
12.44
1.70
113.30
125.74
A
A
A
CA
CB
CG
MET
MET
MET
436
436
436
N
1
14.45
2.00
110.40
124.85
A
A
A
CB
CA
C
TYR
TYR
TYR
442
442
442
N
1
12.30
2.00
118.30
130.60
A
A
A
CG
CD
OE1
GLU
GLU
GLU
463
463
463
N
1
-4.18
0.50
120.30
116.12
A
A
A
NE
CZ
NH1
ARG
ARG
ARG
468
468
468
N
1
3.12
0.50
120.30
123.42
A
A
A
NE
CZ
NH2
ARG
ARG
ARG
468
468
468
N
1
15.97
2.20
113.40
129.37
A
A
A
CA
CB
CG
GLU
GLU
GLU
484
484
484
N
1
21.62
2.30
115.30
136.92
A
A
A
CA
CB
CG
LEU
LEU
LEU
494
494
494
N
1
13.20
1.80
110.60
123.80
A
A
A
N
CA
CB
ASP
ASP
ASP
504
504
504
N
1
11.15
1.50
110.90
122.05
A
A
A
CA
CB
CG1
VAL
VAL
VAL
522
522
522
N
1
A
A
SD
CG
MET
ARG
379
515
0.62
1_555
2_555
1
A
A
SD
CD
MET
ARG
379
515
1.08
1_555
2_555
1
A
A
CE
CE1
LYS
PHE
14
186
1.17
1_555
14_555
1
A
A
CG
CD
MET
ARG
379
515
1.51
1_555
2_555
1
A
A
CE
CZ
LYS
PHE
14
186
1.53
1_555
14_555
1
A
A
OD2
NZ
ASP
LYS
369
530
1.62
1_555
2_555
1
A
A
NZ
CE1
LYS
PHE
14
186
1.63
1_555
14_555
1
A
A
CB
NE
MET
ARG
379
515
1.76
1_555
2_555
1
A
A
CB
CD
MET
ARG
379
515
1.87
1_555
2_555
1
A
A
CD2
CB
LEU
PHE
373
527
1.91
1_555
2_555
1
A
A
NE
NE
ARG
ARG
19
19
1.93
1_555
8_555
1
A
A
SD
CB
MET
ARG
379
515
1.94
1_555
2_555
1
A
A
CE
NE2
MET
GLN
379
500
2.00
1_555
2_555
1
A
A
SD
NE
MET
ARG
379
515
2.06
1_555
2_555
1
A
A
NZ
CD1
LYS
PHE
14
186
2.11
1_555
14_555
1
A
A
CE
CG
MET
ARG
379
515
2.17
1_555
2_555
1
A
A
CE
CD
MET
GLN
379
500
2.17
1_555
2_555
1
A
GLU
5
55.21
-67.54
1
A
LEU
23
36.54
-121.97
1
A
SER
24
-61.28
-71.71
1
A
SER
25
-69.94
-148.22
1
A
PHE
35
-141.52
-6.80
1
A
PRO
39
-80.69
39.52
1
A
PHE
45
76.89
-16.46
1
A
PHE
120
81.46
-1.63
1
A
GLU
140
44.77
80.07
1
A
HIS
159
-27.04
-56.99
1
A
ALA
164
-159.95
69.45
1
A
ASN
167
25.52
28.60
1
A
ASN
183
-143.20
-5.06
1
A
SER
200
68.10
-100.48
1
A
ARG
216
-31.86
-38.53
1
A
GLU
299
-111.34
-74.73
1
A
THR
317
-135.49
-159.27
1
A
ASP
326
-118.32
75.15
1
A
SER
329
-22.75
-68.27
1
A
LEU
333
-26.14
-59.79
1
A
GLU
344
-69.24
13.75
1
A
SER
345
28.97
63.11
1
A
VAL
360
-115.40
56.43
1
A
TRP
378
63.96
-29.99
1
A
ASP
380
-159.10
34.38
1
A
ASP
381
-54.70
7.45
1
A
VAL
400
-133.16
-66.24
1
A
PRO
451
-48.79
-2.24
1
A
PRO
493
-47.22
155.60
1
A
LYS
498
-63.65
-78.24
1
A
THR
507
-69.69
9.58
1
A
PRO
509
-53.46
108.19
1
A
MET
510
-26.63
126.93
1
A
ARG
515
37.14
71.70
1
A
ARG
517
33.83
44.92
1
A
GLN
526
-105.25
-62.97
NO REFINEMENT WAS CARRIED OUT ON THE MODEL. FINAL MODEL IS MOLECULAR
REPLACEMENT SOLUTION FOR SEARCH MODEL 2ACE.
ONLY ONE MONOMER WAS FOUND TO OCCUPY THE ASYMMETRIC UNIT.
THE FULL PACKING OF THE UNIT CELL (16 MONOMERS, 4
TETRAMERS) SHOWS LARGE VOIDS THAT COULD EASILY BE OCCUPIED
BY FOUR MORE TETRAMERS BY SIMPLE TRANSLATION OF THE
OBTAINED TETRAMERS BY HALF THE C AXIS. REFINEMENT DOES NOT
AGREE WITH TWO MONOMERS IN THE ASYMMETRIC UNIT.
4.5
1
MOLECULAR REPLACEMENT
PDB ENTRY 2ACE
4.5
0
4115
0
0
4115
4.5
34.3
1EEA
9717
0.0
0.097
1
6.7
3.2
95.3
0.272
4.5
4.65
2.0
1
1.7
75.2
data scaling
X-GEN
data reduction
X-GEN
model building
X-PLOR
phasing
X-PLOR
Acetylcholinesterase
1
N
N
A
GLY
41
A
GLY
41
HELX_P
A
MET
43
A
MET
43
5
1
3
A
SER
79
A
SER
79
HELX_P
A
TRP
84
A
TRP
84
1
2
6
A
ASP
128
A
ASP
128
HELX_P
A
TYR
130
A
TYR
130
5
3
3
A
LYS
133
A
LYS
133
HELX_P
A
GLU
139
A
GLU
139
1
4
7
A
GLY
151
A
GLY
151
HELX_P
A
PHE
155
A
PHE
155
1
5
5
A
VAL
168
A
VAL
168
HELX_P
A
PHE
186
A
PHE
186
1
6
19
A
ALA
201
A
ALA
201
HELX_P
A
LEU
211
A
LEU
211
1
7
11
A
ARG
216
A
ARG
216
HELX_P
A
LEU
218
A
LEU
218
5
8
3
A
VAL
238
A
VAL
238
HELX_P
A
ASN
251
A
ASN
251
1
9
14
A
ASP
259
A
ASP
259
HELX_P
A
GLU
268
A
GLU
268
1
10
10
A
PRO
271
A
PRO
271
HELX_P
A
ASN
280
A
ASN
280
1
11
10
A
LEU
305
A
LEU
305
HELX_P
A
SER
311
A
SER
311
1
12
7
A
SER
329
A
SER
329
HELX_P
A
GLY
335
A
GLY
335
1
13
7
A
ARG
349
A
ARG
349
HELX_P
A
SER
359
A
SER
359
1
14
11
A
ASP
365
A
ASP
365
HELX_P
A
TYR
375
A
TYR
375
1
15
11
A
GLY
384
A
GLY
384
HELX_P
A
ASN
399
A
ASN
399
1
16
16
A
ILE
401
A
ILE
401
HELX_P
A
LYS
413
A
LYS
413
1
17
13
A
GLU
434
A
GLU
434
HELX_P
A
MET
436
A
MET
436
5
18
3
A
ILE
444
A
ILE
444
HELX_P
A
VAL
447
A
VAL
447
1
19
4
A
LEU
450
A
LEU
450
HELX_P
A
LEU
452
A
LEU
452
5
20
3
A
LYS
454
A
LYS
454
HELX_P
A
LEU
456
A
LEU
456
5
21
3
A
ALA
460
A
ALA
460
HELX_P
A
THR
479
A
THR
479
1
22
20
A
VAL
518
A
VAL
518
HELX_P
A
ASN
525
A
ASN
525
1
23
8
A
PHE
527
A
PHE
527
HELX_P
A
LEU
532
A
LEU
532
1
24
6
disulf
2.002
A
CYS
67
A
SG
CYS
67
1_555
A
CYS
94
A
SG
CYS
94
1_555
disulf
1.929
A
CYS
254
A
SG
CYS
254
1_555
A
CYS
265
A
SG
CYS
265
1_555
disulf
2.027
A
CYS
402
A
SG
CYS
402
1_555
A
CYS
521
A
SG
CYS
521
1_555
HYDROLASE
SERINE HYDROLASE, ALPHA/BETA HYDROLASE, TETRAMER, HYDROLASE
A
SER
103
A
SER
103
1
A
PRO
104
A
PRO
104
2.22
ACES_TORCA
UNP
1
P04058
22
555
1EEA
1
534
P04058
A
1
1
534
3
11
2
anti-parallel
parallel
anti-parallel
anti-parallel
anti-parallel
parallel
parallel
parallel
parallel
parallel
parallel
anti-parallel
parallel
A
LEU
7
A
LEU
7
A
THR
10
A
THR
10
A
GLY
13
A
GLY
13
A
MET
16
A
MET
16
A
VAL
57
A
VAL
57
A
ASN
59
A
ASN
59
A
THR
18
A
THR
18
A
PRO
21
A
PRO
21
A
HIS
26
A
HIS
26
A
PHE
30
A
PHE
30
A
LEU
97
A
LEU
97
A
VAL
101
A
VAL
101
A
VAL
142
A
VAL
142
A
LEU
146
A
LEU
146
A
VAL
111
A
VAL
111
A
ILE
115
A
ILE
115
A
VAL
194
A
VAL
194
A
GLU
199
A
GLU
199
A
ARG
221
A
ARG
221
A
GLN
225
A
GLN
225
A
ILE
319
A
ILE
319
A
ASN
324
A
ASN
324
A
THR
418
A
THR
418
A
PHE
423
A
PHE
423
A
LYS
501
A
LYS
501
A
LEU
505
A
LEU
505
A
VAL
512
A
VAL
512
A
GLN
514
A
GLN
514
A
SER
235
A
SER
235
A
SER
237
A
SER
237
A
PRO
294
A
PRO
294
A
ILE
296
A
ILE
296
22
F 2 2 2