0.031646
0.016692
0.016910
0.000000
0.033982
0.008369
0.000000
0.000000
0.026275
0.00000
0.00000
0.00000
Prota, A.E.
Sage, D.R.
Stehle, T.
Fingeroth, J.D.
http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic
1
91.51
111.44
117.81
31.6
33.27
42.11
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
H2 O
18.015
WATER
non-polymer
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
C8 H15 N O6
221.208
2-acetamido-2-deoxy-beta-D-glucopyranose
N-acetyl-beta-D-glucosamine; 2-acetamido-2-deoxy-beta-D-glucose; 2-acetamido-2-deoxy-D-glucose; 2-acetamido-2-deoxy-glucose; N-ACETYL-D-GLUCOSAMINE
D-saccharide, beta 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
O
N
159
N
H
N
160
N
H
N
161
N
N
N
162
S
C
N
163
N
C
N
164
N
O
N
165
S
C
N
166
N
C
N
167
N
C
N
168
N
C
N
169
N
O
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
H
N
181
N
H
N
182
N
H
N
183
N
N
N
184
S
C
N
185
N
C
N
186
N
O
N
187
N
C
N
188
N
C
N
189
N
C
N
190
N
C
N
191
N
O
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
H
N
203
N
H
N
204
N
H
N
205
N
N
N
206
S
C
N
207
N
C
N
208
N
O
N
209
N
C
N
210
N
C
N
211
N
C
N
212
N
C
N
213
N
N
N
214
N
O
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
H
N
228
N
H
N
229
N
H
N
230
N
N
N
231
S
C
N
232
N
C
N
233
N
O
N
234
N
C
N
235
N
C
N
236
N
S
N
237
N
C
N
238
N
O
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
H
N
248
N
H
N
249
N
H
N
250
R
C
N
251
R
C
N
252
R
C
N
253
S
C
N
254
R
C
N
255
N
C
N
256
N
C
N
257
N
C
N
258
N
N
N
259
N
O
N
260
N
O
N
261
N
O
N
262
N
O
N
263
N
O
N
264
N
O
N
265
N
H
N
266
N
H
N
267
N
H
N
268
N
H
N
269
N
H
N
270
N
H
N
271
N
H
N
272
N
H
N
273
N
H
N
274
N
H
N
275
N
H
N
276
N
H
N
277
N
H
N
278
N
H
N
279
N
H
N
280
N
N
N
281
S
C
N
282
N
C
N
283
N
O
N
284
N
C
Y
285
N
C
Y
286
N
C
Y
287
N
C
Y
288
N
C
Y
289
N
C
Y
290
N
C
N
291
N
O
N
292
N
H
N
293
N
H
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
H
N
302
N
H
N
303
N
N
N
304
S
C
N
305
N
C
N
306
N
O
N
307
N
C
N
308
N
C
N
309
N
C
N
310
N
O
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
H
N
319
N
H
N
320
N
N
N
321
S
C
N
322
N
C
N
323
N
O
N
324
N
C
N
325
N
O
N
326
N
O
N
327
N
H
N
328
N
H
N
329
N
H
N
330
N
H
N
331
N
H
N
332
N
H
N
333
N
H
N
334
N
N
N
335
S
C
N
336
N
C
N
337
N
O
N
338
R
C
N
339
N
O
N
340
N
C
N
341
N
O
N
342
N
H
N
343
N
H
N
344
N
H
N
345
N
H
N
346
N
H
N
347
N
H
N
348
N
H
N
349
N
H
N
350
N
H
N
351
N
N
N
352
S
C
N
353
N
C
N
354
N
O
N
355
N
C
Y
356
N
C
Y
357
N
C
Y
358
N
C
Y
359
N
N
Y
360
N
C
Y
361
N
C
Y
362
N
C
Y
363
N
C
Y
364
N
C
N
365
N
O
N
366
N
H
N
367
N
H
N
368
N
H
N
369
N
H
N
370
N
H
N
371
N
H
N
372
N
H
N
373
N
H
N
374
N
H
N
375
N
H
N
376
N
H
N
377
N
H
N
378
N
N
N
379
S
C
N
380
N
C
N
381
N
O
N
382
N
C
Y
383
N
C
Y
384
N
C
Y
385
N
C
Y
386
N
C
Y
387
N
C
Y
388
N
C
N
389
N
O
N
390
N
O
N
391
N
H
N
392
N
H
N
393
N
H
N
394
N
H
N
395
N
H
N
396
N
H
N
397
N
H
N
398
N
H
N
399
N
H
N
400
N
H
N
401
N
H
N
402
N
N
N
403
S
C
N
404
N
C
N
405
N
O
N
406
N
C
N
407
N
C
N
408
N
C
N
409
N
O
N
410
N
H
N
411
N
H
N
412
N
H
N
413
N
H
N
414
N
H
N
415
N
H
N
416
N
H
N
417
N
H
N
418
N
H
N
419
N
H
N
420
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
sing
N
157
N
sing
N
158
N
doub
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
sing
N
178
N
sing
N
179
N
doub
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
sing
N
199
N
sing
N
200
N
doub
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
sing
N
223
N
sing
N
224
N
doub
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
sing
N
242
N
sing
N
243
N
sing
N
244
N
sing
N
245
N
sing
N
246
N
sing
N
247
N
sing
N
248
N
sing
N
249
N
sing
N
250
N
sing
N
251
N
sing
N
252
N
sing
N
253
N
sing
N
254
N
sing
N
255
N
sing
N
256
N
sing
N
257
N
sing
N
258
N
doub
N
259
N
sing
N
260
N
sing
N
261
N
sing
N
262
N
sing
N
263
N
sing
N
264
N
sing
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
doub
N
274
N
sing
N
275
N
sing
N
276
N
sing
N
277
N
sing
Y
278
N
doub
Y
279
N
sing
Y
280
N
sing
N
281
N
sing
Y
282
N
doub
N
283
N
sing
Y
284
N
doub
N
285
N
sing
Y
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
sing
N
295
N
sing
N
296
N
doub
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
sing
N
311
N
sing
N
312
N
sing
N
313
N
doub
N
314
N
sing
N
315
N
sing
N
316
N
sing
N
317
N
sing
N
318
N
sing
N
319
N
sing
N
320
N
sing
N
321
N
sing
N
322
N
sing
N
323
N
sing
N
324
N
sing
N
325
N
sing
N
326
N
doub
N
327
N
sing
N
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
sing
N
339
N
sing
N
340
N
sing
N
341
N
sing
N
342
N
doub
N
343
N
sing
N
344
N
sing
N
345
N
sing
N
346
N
sing
Y
347
N
doub
Y
348
N
sing
Y
349
N
sing
N
350
N
sing
Y
351
N
doub
Y
352
N
sing
Y
353
N
sing
N
354
N
sing
Y
355
N
sing
Y
356
N
doub
N
357
N
sing
Y
358
N
doub
N
359
N
sing
Y
360
N
sing
N
361
N
sing
N
362
N
sing
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
doub
N
371
N
sing
N
372
N
sing
N
373
N
sing
N
374
N
sing
Y
375
N
doub
Y
376
N
sing
Y
377
N
sing
N
378
N
sing
Y
379
N
doub
N
380
N
sing
Y
381
N
doub
N
382
N
sing
Y
383
N
sing
N
384
N
sing
N
385
N
sing
N
386
N
sing
N
387
N
sing
N
388
N
sing
N
389
N
sing
N
390
N
sing
N
391
N
sing
N
392
N
sing
N
393
N
sing
N
394
N
doub
N
395
N
sing
N
396
N
sing
N
397
N
sing
N
398
N
sing
N
399
N
sing
N
400
N
sing
N
401
N
sing
N
402
N
sing
N
403
N
sing
N
404
N
sing
N
405
N
sing
US
Proc.Natl.Acad.Sci.USA
PNASA6
0040
0027-8424
99
10641
10646
10.1073/pnas.162360499
12122212
The crystal structure of human CD21: Implications for Epstein-Barr virus and C3d binding.
2002
10.2210/pdb1ly2/pdb
pdb_00001ly2
1.000000
0.000000
0.000000
0.000000
1.000000
0.000000
0.000000
0.000000
1.000000
0.00000
0.00000
0.00000
100
1
wiggler
CCD
2001-02-01
CUSTOM-MADE
wiggler
SINGLE WAVELENGTH
M
x-ray
1
1.05
1.0
X25
NSLS
1.05
SYNCHROTRON
NSLS BEAMLINE X25
14256.318
complement receptor type 2
1
man
polymer
221.208
2-acetamido-2-deoxy-beta-D-glucopyranose
2
man
non-polymer
18.015
water
146
nat
water
CD21; Epstein-Barr virus receptor
no
no
EASCGSPPPILNGRISYYSTPIAVGTVIRYSCSGTFRLIGEKSLLCITKDKVDGTWDKPAPKCEYFNKYSSCPEPIVPGG
YKIRGSTPYRHGDSVTFACKTNFSMNGNKSVWCQANNMWGPTRLPTCVSI
EASCGSPPPILNGRISYYSTPIAVGTVIRYSCSGTFRLIGEKSLLCITKDKVDGTWDKPAPKCEYFNKYSSCPEPIVPGG
YKIRGSTPYRHGDSVTFACKTNFSMNGNKSVWCQANNMWGPTRLPTCVSI
A
polypeptide(L)
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
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
human
Homo
Pichia
sample
CR2
9606
Homo sapiens
4922
Pichia pastoris
X-33
PicZa (Invitrogen) secreted protein
2
2.48
50.41
VAPOR DIFFUSION, HANGING DROP
7.5
PEG 4000, pH 7.5, VAPOR DIFFUSION, HANGING DROP at 298K, temperature 298.0K
298.0
chem_comp
entity
pdbx_chem_comp_identifier
pdbx_entity_nonpoly
struct_conn
struct_ref_seq_dif
struct_site
struct_site_gen
chem_comp
chem_comp_atom
chem_comp_bond
database_2
pdbx_initial_refinement_model
repository
Initial release
Carbohydrate remediation
repository
Remediation
Version format compliance
Non-polymer description
Version format compliance
Data collection
Database references
Derived calculations
Structure summary
Data collection
Database references
Refinement description
Structure summary
1
0
2002-07-05
1
1
2008-04-28
1
2
2011-07-13
1
3
2020-07-29
1
4
2024-04-03
_chem_comp.name
_chem_comp.type
_entity.pdbx_description
_pdbx_entity_nonpoly.name
_struct_conn.pdbx_leaving_atom_flag
_struct_conn.pdbx_role
_struct_ref_seq_dif.details
_chem_comp.pdbx_synonyms
_database_2.pdbx_DOI
_database_2.pdbx_database_accession
DGlcpNAcb
N-acetyl-b-D-glucopyranosamine
b-D-GlcpNAc
GlcNAc
RCSB
Y
RCSB
2002-06-06
REL
REL
NAG
2-acetamido-2-deoxy-beta-D-glucopyranose
HOH
water
Crystal structure of liganded CD21 (complex with C3d)
Other
experimental model
NAG
1001
2
NAG
NAG
1001
A
NAG
1002
2
NAG
NAG
1002
A
HOH
1
3
HOH
HOH
1003
A
HOH
2
3
HOH
HOH
1004
A
HOH
3
3
HOH
HOH
1005
A
HOH
4
3
HOH
HOH
1006
A
HOH
5
3
HOH
HOH
1007
A
HOH
6
3
HOH
HOH
1008
A
HOH
7
3
HOH
HOH
1009
A
HOH
8
3
HOH
HOH
1010
A
HOH
9
3
HOH
HOH
1011
A
HOH
10
3
HOH
HOH
1012
A
HOH
11
3
HOH
HOH
1013
A
HOH
12
3
HOH
HOH
1014
A
HOH
13
3
HOH
HOH
1015
A
HOH
14
3
HOH
HOH
1016
A
HOH
15
3
HOH
HOH
1017
A
HOH
16
3
HOH
HOH
1018
A
HOH
17
3
HOH
HOH
1019
A
HOH
18
3
HOH
HOH
1020
A
HOH
19
3
HOH
HOH
1021
A
HOH
20
3
HOH
HOH
1022
A
HOH
21
3
HOH
HOH
1023
A
HOH
22
3
HOH
HOH
1024
A
HOH
23
3
HOH
HOH
1025
A
HOH
24
3
HOH
HOH
1026
A
HOH
25
3
HOH
HOH
1027
A
HOH
26
3
HOH
HOH
1028
A
HOH
27
3
HOH
HOH
1029
A
HOH
28
3
HOH
HOH
1030
A
HOH
29
3
HOH
HOH
1031
A
HOH
30
3
HOH
HOH
1032
A
HOH
31
3
HOH
HOH
1033
A
HOH
32
3
HOH
HOH
1034
A
HOH
33
3
HOH
HOH
1035
A
HOH
34
3
HOH
HOH
1036
A
HOH
35
3
HOH
HOH
1037
A
HOH
36
3
HOH
HOH
1038
A
HOH
37
3
HOH
HOH
1039
A
HOH
38
3
HOH
HOH
1040
A
HOH
39
3
HOH
HOH
1041
A
HOH
40
3
HOH
HOH
1042
A
HOH
41
3
HOH
HOH
1043
A
HOH
42
3
HOH
HOH
1044
A
HOH
43
3
HOH
HOH
1045
A
HOH
44
3
HOH
HOH
1046
A
HOH
45
3
HOH
HOH
1047
A
HOH
46
3
HOH
HOH
1048
A
HOH
47
3
HOH
HOH
1049
A
HOH
48
3
HOH
HOH
1050
A
HOH
49
3
HOH
HOH
1051
A
HOH
50
3
HOH
HOH
1052
A
HOH
51
3
HOH
HOH
1053
A
HOH
52
3
HOH
HOH
1054
A
HOH
53
3
HOH
HOH
1055
A
HOH
54
3
HOH
HOH
1056
A
HOH
55
3
HOH
HOH
1057
A
HOH
56
3
HOH
HOH
1058
A
HOH
57
3
HOH
HOH
1059
A
HOH
58
3
HOH
HOH
1060
A
HOH
59
3
HOH
HOH
1061
A
HOH
60
3
HOH
HOH
1062
A
HOH
61
3
HOH
HOH
1063
A
HOH
62
3
HOH
HOH
1064
A
HOH
63
3
HOH
HOH
1065
A
HOH
64
3
HOH
HOH
1066
A
HOH
65
3
HOH
HOH
1067
A
HOH
66
3
HOH
HOH
1068
A
HOH
67
3
HOH
HOH
1069
A
HOH
68
3
HOH
HOH
1070
A
HOH
69
3
HOH
HOH
1071
A
HOH
70
3
HOH
HOH
1072
A
HOH
71
3
HOH
HOH
1073
A
HOH
72
3
HOH
HOH
1074
A
HOH
73
3
HOH
HOH
1075
A
HOH
74
3
HOH
HOH
1076
A
HOH
75
3
HOH
HOH
1077
A
HOH
76
3
HOH
HOH
1078
A
HOH
77
3
HOH
HOH
1079
A
HOH
78
3
HOH
HOH
1080
A
HOH
79
3
HOH
HOH
1081
A
HOH
80
3
HOH
HOH
1082
A
HOH
81
3
HOH
HOH
1083
A
HOH
82
3
HOH
HOH
1084
A
HOH
83
3
HOH
HOH
1085
A
HOH
84
3
HOH
HOH
1086
A
HOH
85
3
HOH
HOH
1087
A
HOH
86
3
HOH
HOH
1088
A
HOH
87
3
HOH
HOH
1089
A
HOH
88
3
HOH
HOH
1090
A
HOH
89
3
HOH
HOH
1091
A
HOH
90
3
HOH
HOH
1092
A
HOH
91
3
HOH
HOH
1093
A
HOH
92
3
HOH
HOH
1094
A
HOH
93
3
HOH
HOH
1095
A
HOH
94
3
HOH
HOH
1096
A
HOH
95
3
HOH
HOH
1097
A
HOH
96
3
HOH
HOH
1098
A
HOH
97
3
HOH
HOH
1099
A
HOH
98
3
HOH
HOH
1100
A
HOH
99
3
HOH
HOH
1101
A
HOH
100
3
HOH
HOH
1102
A
HOH
101
3
HOH
HOH
1103
A
HOH
102
3
HOH
HOH
1104
A
HOH
103
3
HOH
HOH
1105
A
HOH
104
3
HOH
HOH
1106
A
HOH
105
3
HOH
HOH
1107
A
HOH
106
3
HOH
HOH
1108
A
HOH
107
3
HOH
HOH
1109
A
HOH
109
3
HOH
HOH
1110
A
HOH
111
3
HOH
HOH
1111
A
HOH
112
3
HOH
HOH
1112
A
HOH
113
3
HOH
HOH
1113
A
HOH
114
3
HOH
HOH
1114
A
HOH
115
3
HOH
HOH
1115
A
HOH
116
3
HOH
HOH
1116
A
HOH
117
3
HOH
HOH
1117
A
HOH
118
3
HOH
HOH
1118
A
HOH
119
3
HOH
HOH
1119
A
HOH
120
3
HOH
HOH
1120
A
HOH
121
3
HOH
HOH
1121
A
HOH
122
3
HOH
HOH
1122
A
HOH
123
3
HOH
HOH
1123
A
HOH
124
3
HOH
HOH
1124
A
HOH
125
3
HOH
HOH
1125
A
HOH
126
3
HOH
HOH
1126
A
HOH
127
3
HOH
HOH
1127
A
HOH
129
3
HOH
HOH
1128
A
HOH
130
3
HOH
HOH
1129
A
HOH
131
3
HOH
HOH
1130
A
HOH
132
3
HOH
HOH
1131
A
HOH
133
3
HOH
HOH
1132
A
HOH
134
3
HOH
HOH
1133
A
HOH
135
3
HOH
HOH
1134
A
HOH
136
3
HOH
HOH
1135
A
HOH
137
3
HOH
HOH
1136
A
HOH
138
3
HOH
HOH
1137
A
HOH
139
3
HOH
HOH
1138
A
HOH
140
3
HOH
HOH
1139
A
HOH
141
3
HOH
HOH
1140
A
HOH
142
3
HOH
HOH
1141
A
HOH
143
3
HOH
HOH
1142
A
HOH
144
3
HOH
HOH
1143
A
HOH
145
3
HOH
HOH
1144
A
HOH
146
3
HOH
HOH
1145
A
HOH
147
3
HOH
HOH
1146
A
HOH
148
3
HOH
HOH
1147
A
HOH
149
3
HOH
HOH
1148
A
GLU
0
n
1
GLU
0
A
ALA
1
n
2
ALA
1
A
SER
2
n
3
SER
2
A
CYS
3
n
4
CYS
3
A
GLY
4
n
5
GLY
4
A
SER
5
n
6
SER
5
A
PRO
6
n
7
PRO
6
A
PRO
7
n
8
PRO
7
A
PRO
8
n
9
PRO
8
A
ILE
9
n
10
ILE
9
A
LEU
10
n
11
LEU
10
A
ASN
11
n
12
ASN
11
A
GLY
12
n
13
GLY
12
A
ARG
13
n
14
ARG
13
A
ILE
14
n
15
ILE
14
A
SER
15
n
16
SER
15
A
TYR
16
n
17
TYR
16
A
TYR
17
n
18
TYR
17
A
SER
18
n
19
SER
18
A
THR
19
n
20
THR
19
A
PRO
20
n
21
PRO
20
A
ILE
21
n
22
ILE
21
A
ALA
22
n
23
ALA
22
A
VAL
23
n
24
VAL
23
A
GLY
24
n
25
GLY
24
A
THR
25
n
26
THR
25
A
VAL
26
n
27
VAL
26
A
ILE
27
n
28
ILE
27
A
ARG
28
n
29
ARG
28
A
TYR
29
n
30
TYR
29
A
SER
30
n
31
SER
30
A
CYS
31
n
32
CYS
31
A
SER
32
n
33
SER
32
A
GLY
33
n
34
GLY
33
A
THR
34
n
35
THR
34
A
PHE
35
n
36
PHE
35
A
ARG
36
n
37
ARG
36
A
LEU
37
n
38
LEU
37
A
ILE
38
n
39
ILE
38
A
GLY
39
n
40
GLY
39
A
GLU
40
n
41
GLU
40
A
LYS
41
n
42
LYS
41
A
SER
42
n
43
SER
42
A
LEU
43
n
44
LEU
43
A
LEU
44
n
45
LEU
44
A
CYS
45
n
46
CYS
45
A
ILE
46
n
47
ILE
46
A
THR
47
n
48
THR
47
A
LYS
48
n
49
LYS
48
A
ASP
49
n
50
ASP
49
A
LYS
50
n
51
LYS
50
A
VAL
51
n
52
VAL
51
A
ASP
52
n
53
ASP
52
A
GLY
53
n
54
GLY
53
A
THR
54
n
55
THR
54
A
TRP
55
n
56
TRP
55
A
ASP
56
n
57
ASP
56
A
LYS
57
n
58
LYS
57
A
PRO
58
n
59
PRO
58
A
ALA
59
n
60
ALA
59
A
PRO
60
n
61
PRO
60
A
LYS
61
n
62
LYS
61
A
CYS
62
n
63
CYS
62
A
GLU
63
n
64
GLU
63
A
TYR
64
n
65
TYR
64
A
PHE
65
n
66
PHE
65
A
ASN
66
n
67
ASN
66
A
LYS
67
n
68
LYS
67
A
TYR
68
n
69
TYR
68
A
SER
69
n
70
SER
69
A
SER
70
n
71
SER
70
A
CYS
71
n
72
CYS
71
A
PRO
72
n
73
PRO
72
A
GLU
73
n
74
GLU
73
A
PRO
74
n
75
PRO
74
A
ILE
75
n
76
ILE
75
A
VAL
76
n
77
VAL
76
A
PRO
77
n
78
PRO
77
A
GLY
78
n
79
GLY
78
A
GLY
79
n
80
GLY
79
A
TYR
80
n
81
TYR
80
A
LYS
81
n
82
LYS
81
A
ILE
82
n
83
ILE
82
A
ARG
83
n
84
ARG
83
A
GLY
84
n
85
GLY
84
A
SER
85
n
86
SER
85
A
THR
86
n
87
THR
86
A
PRO
87
n
88
PRO
87
A
TYR
88
n
89
TYR
88
A
ARG
89
n
90
ARG
89
A
HIS
90
n
91
HIS
90
A
GLY
91
n
92
GLY
91
A
ASP
92
n
93
ASP
92
A
SER
93
n
94
SER
93
A
VAL
94
n
95
VAL
94
A
THR
95
n
96
THR
95
A
PHE
96
n
97
PHE
96
A
ALA
97
n
98
ALA
97
A
CYS
98
n
99
CYS
98
A
LYS
99
n
100
LYS
99
A
THR
100
n
101
THR
100
A
ASN
101
n
102
ASN
101
A
PHE
102
n
103
PHE
102
A
SER
103
n
104
SER
103
A
MET
104
n
105
MET
104
A
ASN
105
n
106
ASN
105
A
GLY
106
n
107
GLY
106
A
ASN
107
n
108
ASN
107
A
LYS
108
n
109
LYS
108
A
SER
109
n
110
SER
109
A
VAL
110
n
111
VAL
110
A
TRP
111
n
112
TRP
111
A
CYS
112
n
113
CYS
112
A
GLN
113
n
114
GLN
113
A
ALA
114
n
115
ALA
114
A
ASN
115
n
116
ASN
115
A
ASN
116
n
117
ASN
116
A
MET
117
n
118
MET
117
A
TRP
118
n
119
TRP
118
A
GLY
119
n
120
GLY
119
A
PRO
120
n
121
PRO
120
A
THR
121
n
122
THR
121
A
ARG
122
n
123
ARG
122
A
LEU
123
n
124
LEU
123
A
PRO
124
n
125
PRO
124
A
THR
125
n
126
THR
125
A
CYS
126
n
127
CYS
126
A
VAL
127
n
128
VAL
127
A
SER
128
n
129
SER
128
A
ILE
129
n
130
ILE
129
A
author_defined_assembly
1
monomeric
A
ASN
101
GLYCOSYLATION SITE
A
ASN
102
ASN
A
ASN
107
GLYCOSYLATION SITE
A
ASN
108
ASN
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
A
N
CYS
3
A
N
CYS
4
A
O
ILE
21
A
O
ILE
22
A
N
ARG
13
A
N
ARG
14
A
O
SER
30
A
O
SER
31
A
N
ILE
27
A
N
ILE
28
A
O
LEU
43
A
O
LEU
44
A
N
ILE
46
A
N
ILE
47
A
O
THR
54
A
O
THR
55
A
N
ILE
38
A
N
ILE
39
A
O
LYS
61
A
O
LYS
62
A
N
CYS
71
A
N
CYS
72
A
O
TYR
88
A
O
TYR
89
A
N
TYR
80
A
N
TYR
81
A
O
ALA
97
A
O
ALA
98
A
N
VAL
94
A
N
VAL
95
A
O
VAL
110
A
O
VAL
111
A
N
TRP
111
A
N
TRP
112
A
O
GLY
119
A
O
GLY
120
A
N
SER
103
A
N
SER
104
A
O
VAL
127
A
O
VAL
128
0.234
0.179
1.80
20.0
1127
12743
11265
10.
random
1
THROUGHOUT
0.0
MOLECULAR REPLACEMENT
Crystal structure of liganded CD21 (complex with C3d)
Engh & Huber
1.80
20.0
146
1170
28
0
996
0.007
1.34
1.80
30
1LY2
12743
11265
1
88.4
1.80
1.90
0.1
1
55.8
data reduction
DENZO
data scaling
SCALEPACK
phasing
AMoRE
refinement
X-PLOR
Crystal structure of unliganded human CD21 SCR1-SCR2 (Complement receptor type 2)
1
N
N
2
N
N
2
N
N
3
N
N
disulf
2.035
A
CYS
3
A
SG
CYS
4
1_555
A
CYS
45
A
SG
CYS
46
1_555
disulf
2.042
A
CYS
31
A
SG
CYS
32
1_555
A
CYS
62
A
SG
CYS
63
1_555
disulf
2.054
A
CYS
71
A
SG
CYS
72
1_555
A
CYS
112
A
SG
CYS
113
1_555
disulf
2.047
A
CYS
98
A
SG
CYS
99
1_555
A
CYS
126
A
SG
CYS
127
1_555
covale
1.455
one
N-Glycosylation
A
ASN
101
A
ND2
ASN
102
1_555
A
NAG
1001
B
C1
NAG
1_555
covale
1.459
one
N-Glycosylation
A
ASN
107
A
ND2
ASN
108
1_555
A
NAG
1002
C
C1
NAG
1_555
IMMUNE SYSTEM
Complement receptor; Epstein Barr virus; Regulator of complement activation; short consensus repeat; viral receptor; complement control protein, IMMUNE SYSTEM
A
THR
19
A
THR
20
1
A
PRO
20
A
PRO
21
-0.16
A
THR
86
A
THR
87
1
A
PRO
87
A
PRO
88
-0.22
A
GLY
119
A
GLY
120
1
A
PRO
120
A
PRO
121
0.15
CR2_HUMAN
UNP
1
20
P20023
GISCGSPPPILNGRISYYSTPIAVGTVIRYSCSGTFRLIGEKSLLCITKDKVDGTWDKPAPKCEYFNKYSSCPEPIVPGG
YKIRGSTPYRHGDSVTFACKTNFSMNGNKSVWCQANNMWGPTRLPTCVSV
20
149
1LY2
0
129
P20023
A
1
1
130
1
GLY
cloning artifact
GLU
0
1LY2
A
P20023
UNP
20
1
1
ILE
cloning artifact
ALA
1
1LY2
A
P20023
UNP
21
2
1
VAL
cloning artifact
ILE
129
1LY2
A
P20023
UNP
149
130
2
4
2
2
4
2
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
A
SER
2
A
SER
3
A
CYS
3
A
CYS
4
A
ILE
21
A
ILE
22
A
ALA
22
A
ALA
23
A
GLY
12
A
GLY
13
A
ILE
14
A
ILE
15
A
VAL
26
A
VAL
27
A
CYS
31
A
CYS
32
A
SER
42
A
SER
43
A
ILE
46
A
ILE
47
A
THR
54
A
THR
55
A
TRP
55
A
TRP
56
A
PHE
35
A
PHE
36
A
ILE
38
A
ILE
39
A
LYS
61
A
LYS
62
A
TYR
64
A
TYR
65
A
SER
70
A
SER
71
A
CYS
71
A
CYS
72
A
TYR
88
A
TYR
89
A
ARG
89
A
ARG
90
A
GLY
79
A
GLY
80
A
ARG
83
A
ARG
84
A
SER
93
A
SER
94
A
CYS
98
A
CYS
99
A
SER
109
A
SER
110
A
CYS
112
A
CYS
113
A
TRP
118
A
TRP
119
A
GLY
119
A
GLY
120
A
PHE
102
A
PHE
103
A
ASN
105
A
ASN
106
A
THR
125
A
THR
126
A
SER
128
A
SER
129
1
triclinic
P 1