0.009747
0.000000
0.008644
0.000000
0.015013
0.000000
0.000000
0.000000
0.013405
0.00000
0.00000
0.00000
CIS PROLINE - PRO D 93
CIS PROLINE - PRO E 93
CIS PROLINE - PRO F 93
CIS PROLINE - PRO G 93
CIS PROLINE - PRO H 93
Merritt, E.A.
Hol, W.G.J.
http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic
20
90.00
131.57
90.00
102.600
66.610
99.710
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
Cl -1
35.453
CHLORIDE ION
non-polymer
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
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
UK
Structure
STRUE6
2005
0969-2126
3
561
570
10.1016/S0969-2126(01)00190-3
8590017
Surprising leads for a cholera toxin receptor-binding antagonist: crystallographic studies of CTB mutants.
1995
US
Protein Sci.
PRCIEI
0795
0961-8368
3
166
2.2 Angstroms Crystal Structure of Cholera Toxin B5 Pentamer Bound to Receptor GM1 Pentasaccharide
1994
UK
Mol.Microbiol.
MOMIEE
2007
0950-382X
5
1755
Analysis of Structure and Function of the B Subunit of Cholera Toxin by the Use of Site-Directed Mutagenesis
1991
10.2210/pdb1chp/pdb
pdb_00001chp
1.000000
0.000000
0.000000
0.000000
1.000000
0.000000
0.000000
0.000000
1.000000
0.00000
0.00000
0.00000
1
AREA DETECTOR
1994-07-14
SIEMENS X1000
M
x-ray
1
1.54
1.0
1.54
11681.303
CHOLERA TOXIN B PENTAMER
G33D
5
man
polymer
35.453
CHLORIDE ION
1
syn
non-polymer
18.015
water
248
nat
water
CHOLERAGEN
no
no
TPQNITDLCAEYHNTQIHTLNDKIFSYTESLADKREMAIITFKNGATFQVEVPGSQHIDSQKKAIERMKDTLRIAYLTEA
KVEKLCVWNNKTPHAIAAISMAN
TPQNITDLCAEYHNTQIHTLNDKIFSYTESLADKREMAIITFKNGATFQVEVPGSQHIDSQKKAIERMKDTLRIAYLTEA
KVEKLCVWNNKTPHAIAAISMAN
D,E,F,G,H
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
Vibrio
OGAWA 41 (CLASSICAL)
Escherichia
sample
666
Vibrio cholerae
562
Escherichia coli
2.18
43.62
7.5
pH 7.5
database_2
pdbx_database_status
struct_ref_seq_dif
struct_site
repository
Initial release
Version format compliance
Version format compliance
Database references
Derived calculations
Other
1
0
1996-03-08
1
1
2008-03-24
1
2
2011-07-13
1
3
2021-11-03
_database_2.pdbx_DOI
_database_2.pdbx_database_accession
_pdbx_database_status.process_site
_struct_ref_seq_dif.details
_struct_site.pdbx_auth_asym_id
_struct_site.pdbx_auth_comp_id
_struct_site.pdbx_auth_seq_id
SHEET
IN THE PENTAMER THE BETA SHEETS FROM ADJACENT MONOMERS
COMBINE TO FORM A CONTINUOUS SIX-STRANDED ANTI-PARALLEL
SHEET ACROSS EACH MONOMER-MONOMER INTERFACE.
Y
BNL
1995-02-15
REL
REL
CL
CHLORIDE ION
HOH
water
THE FIVE IDENTICAL B SUBUNITS ARE LABELLED AS CHAINS D, E,
F, G, AND H CORRESPONDING TO CHAIN IDENTIFIERS USED FOR
THE RELATED HEAT-LABILE ENTEROTOXIN (LT) FROM ESCHERICHIA
COLI AND FOR THE WILD TYPE CHOLERA TOXIN/RECEPTOR COMPLEX.
SUBUNIT CHAIN RESIDUES
B#1 D 1 - 103
B#2 E 1 - 103
B#3 F 1 - 103
B#4 G 1 - 103
B#5 H 1 - 103
WATER 1 - 248
CHLORIDE 249 - 249
CL
249
2
CL
CL
249
H
HOH
3
3
HOH
HOH
104
D
HOH
5
3
HOH
HOH
105
D
HOH
7
3
HOH
HOH
106
D
HOH
10
3
HOH
HOH
107
D
HOH
16
3
HOH
HOH
108
D
HOH
25
3
HOH
HOH
109
D
HOH
42
3
HOH
HOH
110
D
HOH
43
3
HOH
HOH
111
D
HOH
46
3
HOH
HOH
112
D
HOH
51
3
HOH
HOH
113
D
HOH
57
3
HOH
HOH
114
D
HOH
58
3
HOH
HOH
115
D
HOH
62
3
HOH
HOH
116
D
HOH
67
3
HOH
HOH
117
D
HOH
69
3
HOH
HOH
118
D
HOH
70
3
HOH
HOH
119
D
HOH
75
3
HOH
HOH
120
D
HOH
79
3
HOH
HOH
121
D
HOH
89
3
HOH
HOH
122
D
HOH
90
3
HOH
HOH
123
D
HOH
91
3
HOH
HOH
124
D
HOH
93
3
HOH
HOH
125
D
HOH
98
3
HOH
HOH
126
D
HOH
101
3
HOH
HOH
127
D
HOH
105
3
HOH
HOH
128
D
HOH
107
3
HOH
HOH
129
D
HOH
120
3
HOH
HOH
130
D
HOH
124
3
HOH
HOH
131
D
HOH
134
3
HOH
HOH
132
D
HOH
136
3
HOH
HOH
133
D
HOH
138
3
HOH
HOH
134
D
HOH
142
3
HOH
HOH
135
D
HOH
154
3
HOH
HOH
136
D
HOH
163
3
HOH
HOH
137
D
HOH
171
3
HOH
HOH
138
D
HOH
172
3
HOH
HOH
139
D
HOH
175
3
HOH
HOH
140
D
HOH
176
3
HOH
HOH
141
D
HOH
188
3
HOH
HOH
142
D
HOH
195
3
HOH
HOH
143
D
HOH
199
3
HOH
HOH
144
D
HOH
206
3
HOH
HOH
145
D
HOH
213
3
HOH
HOH
146
D
HOH
221
3
HOH
HOH
147
D
HOH
226
3
HOH
HOH
148
D
HOH
232
3
HOH
HOH
149
D
HOH
240
3
HOH
HOH
150
D
HOH
9
3
HOH
HOH
104
E
HOH
14
3
HOH
HOH
105
E
HOH
21
3
HOH
HOH
106
E
HOH
22
3
HOH
HOH
107
E
HOH
34
3
HOH
HOH
108
E
HOH
36
3
HOH
HOH
109
E
HOH
39
3
HOH
HOH
110
E
HOH
44
3
HOH
HOH
111
E
HOH
50
3
HOH
HOH
112
E
HOH
54
3
HOH
HOH
113
E
HOH
61
3
HOH
HOH
114
E
HOH
65
3
HOH
HOH
115
E
HOH
76
3
HOH
HOH
116
E
HOH
77
3
HOH
HOH
117
E
HOH
85
3
HOH
HOH
118
E
HOH
87
3
HOH
HOH
119
E
HOH
97
3
HOH
HOH
120
E
HOH
104
3
HOH
HOH
121
E
HOH
108
3
HOH
HOH
122
E
HOH
117
3
HOH
HOH
123
E
HOH
125
3
HOH
HOH
124
E
HOH
135
3
HOH
HOH
125
E
HOH
137
3
HOH
HOH
126
E
HOH
139
3
HOH
HOH
127
E
HOH
152
3
HOH
HOH
128
E
HOH
153
3
HOH
HOH
129
E
HOH
157
3
HOH
HOH
130
E
HOH
160
3
HOH
HOH
131
E
HOH
161
3
HOH
HOH
132
E
HOH
165
3
HOH
HOH
133
E
HOH
166
3
HOH
HOH
134
E
HOH
167
3
HOH
HOH
135
E
HOH
169
3
HOH
HOH
136
E
HOH
173
3
HOH
HOH
137
E
HOH
178
3
HOH
HOH
138
E
HOH
179
3
HOH
HOH
139
E
HOH
181
3
HOH
HOH
140
E
HOH
182
3
HOH
HOH
141
E
HOH
184
3
HOH
HOH
142
E
HOH
186
3
HOH
HOH
143
E
HOH
189
3
HOH
HOH
144
E
HOH
194
3
HOH
HOH
145
E
HOH
203
3
HOH
HOH
146
E
HOH
208
3
HOH
HOH
147
E
HOH
212
3
HOH
HOH
148
E
HOH
214
3
HOH
HOH
149
E
HOH
215
3
HOH
HOH
150
E
HOH
216
3
HOH
HOH
151
E
HOH
223
3
HOH
HOH
152
E
HOH
224
3
HOH
HOH
153
E
HOH
236
3
HOH
HOH
154
E
HOH
237
3
HOH
HOH
155
E
HOH
238
3
HOH
HOH
156
E
HOH
244
3
HOH
HOH
157
E
HOH
11
3
HOH
HOH
104
F
HOH
13
3
HOH
HOH
105
F
HOH
17
3
HOH
HOH
106
F
HOH
27
3
HOH
HOH
107
F
HOH
28
3
HOH
HOH
108
F
HOH
29
3
HOH
HOH
109
F
HOH
30
3
HOH
HOH
110
F
HOH
33
3
HOH
HOH
111
F
HOH
37
3
HOH
HOH
112
F
HOH
41
3
HOH
HOH
113
F
HOH
45
3
HOH
HOH
114
F
HOH
56
3
HOH
HOH
115
F
HOH
59
3
HOH
HOH
116
F
HOH
63
3
HOH
HOH
117
F
HOH
64
3
HOH
HOH
118
F
HOH
66
3
HOH
HOH
119
F
HOH
72
3
HOH
HOH
120
F
HOH
81
3
HOH
HOH
121
F
HOH
94
3
HOH
HOH
122
F
HOH
96
3
HOH
HOH
123
F
HOH
103
3
HOH
HOH
124
F
HOH
109
3
HOH
HOH
125
F
HOH
112
3
HOH
HOH
126
F
HOH
113
3
HOH
HOH
127
F
HOH
114
3
HOH
HOH
128
F
HOH
116
3
HOH
HOH
129
F
HOH
119
3
HOH
HOH
130
F
HOH
121
3
HOH
HOH
131
F
HOH
126
3
HOH
HOH
132
F
HOH
128
3
HOH
HOH
133
F
HOH
130
3
HOH
HOH
134
F
HOH
133
3
HOH
HOH
135
F
HOH
141
3
HOH
HOH
136
F
HOH
143
3
HOH
HOH
137
F
HOH
144
3
HOH
HOH
138
F
HOH
158
3
HOH
HOH
139
F
HOH
162
3
HOH
HOH
140
F
HOH
174
3
HOH
HOH
141
F
HOH
183
3
HOH
HOH
142
F
HOH
187
3
HOH
HOH
143
F
HOH
193
3
HOH
HOH
144
F
HOH
200
3
HOH
HOH
145
F
HOH
201
3
HOH
HOH
146
F
HOH
207
3
HOH
HOH
147
F
HOH
217
3
HOH
HOH
148
F
HOH
218
3
HOH
HOH
149
F
HOH
220
3
HOH
HOH
150
F
HOH
222
3
HOH
HOH
151
F
HOH
225
3
HOH
HOH
152
F
HOH
227
3
HOH
HOH
153
F
HOH
228
3
HOH
HOH
154
F
HOH
230
3
HOH
HOH
155
F
HOH
231
3
HOH
HOH
156
F
HOH
233
3
HOH
HOH
157
F
HOH
235
3
HOH
HOH
158
F
HOH
239
3
HOH
HOH
159
F
HOH
246
3
HOH
HOH
160
F
HOH
1
3
HOH
HOH
104
G
HOH
2
3
HOH
HOH
105
G
HOH
8
3
HOH
HOH
106
G
HOH
12
3
HOH
HOH
107
G
HOH
19
3
HOH
HOH
108
G
HOH
20
3
HOH
HOH
109
G
HOH
32
3
HOH
HOH
110
G
HOH
35
3
HOH
HOH
111
G
HOH
38
3
HOH
HOH
112
G
HOH
49
3
HOH
HOH
113
G
HOH
52
3
HOH
HOH
114
G
HOH
53
3
HOH
HOH
115
G
HOH
71
3
HOH
HOH
116
G
HOH
73
3
HOH
HOH
117
G
HOH
78
3
HOH
HOH
118
G
HOH
84
3
HOH
HOH
119
G
HOH
86
3
HOH
HOH
120
G
HOH
88
3
HOH
HOH
121
G
HOH
99
3
HOH
HOH
122
G
HOH
100
3
HOH
HOH
123
G
HOH
102
3
HOH
HOH
124
G
HOH
110
3
HOH
HOH
125
G
HOH
118
3
HOH
HOH
126
G
HOH
122
3
HOH
HOH
127
G
HOH
131
3
HOH
HOH
128
G
HOH
132
3
HOH
HOH
129
G
HOH
145
3
HOH
HOH
130
G
HOH
146
3
HOH
HOH
131
G
HOH
147
3
HOH
HOH
132
G
HOH
150
3
HOH
HOH
133
G
HOH
155
3
HOH
HOH
134
G
HOH
156
3
HOH
HOH
135
G
HOH
159
3
HOH
HOH
136
G
HOH
164
3
HOH
HOH
137
G
HOH
185
3
HOH
HOH
138
G
HOH
190
3
HOH
HOH
139
G
HOH
191
3
HOH
HOH
140
G
HOH
192
3
HOH
HOH
141
G
HOH
197
3
HOH
HOH
142
G
HOH
202
3
HOH
HOH
143
G
HOH
205
3
HOH
HOH
144
G
HOH
209
3
HOH
HOH
145
G
HOH
219
3
HOH
HOH
146
G
HOH
242
3
HOH
HOH
147
G
HOH
4
3
HOH
HOH
250
H
HOH
6
3
HOH
HOH
251
H
HOH
15
3
HOH
HOH
252
H
HOH
18
3
HOH
HOH
253
H
HOH
23
3
HOH
HOH
254
H
HOH
24
3
HOH
HOH
255
H
HOH
26
3
HOH
HOH
256
H
HOH
31
3
HOH
HOH
257
H
HOH
40
3
HOH
HOH
258
H
HOH
47
3
HOH
HOH
259
H
HOH
48
3
HOH
HOH
260
H
HOH
55
3
HOH
HOH
261
H
HOH
60
3
HOH
HOH
262
H
HOH
68
3
HOH
HOH
263
H
HOH
74
3
HOH
HOH
264
H
HOH
80
3
HOH
HOH
265
H
HOH
82
3
HOH
HOH
266
H
HOH
83
3
HOH
HOH
267
H
HOH
92
3
HOH
HOH
268
H
HOH
95
3
HOH
HOH
269
H
HOH
106
3
HOH
HOH
270
H
HOH
111
3
HOH
HOH
271
H
HOH
115
3
HOH
HOH
272
H
HOH
123
3
HOH
HOH
273
H
HOH
127
3
HOH
HOH
274
H
HOH
129
3
HOH
HOH
275
H
HOH
140
3
HOH
HOH
276
H
HOH
148
3
HOH
HOH
277
H
HOH
149
3
HOH
HOH
278
H
HOH
151
3
HOH
HOH
279
H
HOH
168
3
HOH
HOH
280
H
HOH
170
3
HOH
HOH
281
H
HOH
177
3
HOH
HOH
282
H
HOH
180
3
HOH
HOH
283
H
HOH
196
3
HOH
HOH
284
H
HOH
198
3
HOH
HOH
285
H
HOH
204
3
HOH
HOH
286
H
HOH
210
3
HOH
HOH
287
H
HOH
211
3
HOH
HOH
288
H
HOH
229
3
HOH
HOH
289
H
HOH
234
3
HOH
HOH
290
H
HOH
241
3
HOH
HOH
291
H
HOH
243
3
HOH
HOH
292
H
HOH
245
3
HOH
HOH
293
H
HOH
247
3
HOH
HOH
294
H
HOH
248
3
HOH
HOH
295
H
THR
1
n
1
THR
1
D
PRO
2
n
2
PRO
2
D
GLN
3
n
3
GLN
3
D
ASN
4
n
4
ASN
4
D
ILE
5
n
5
ILE
5
D
THR
6
n
6
THR
6
D
ASP
7
n
7
ASP
7
D
LEU
8
n
8
LEU
8
D
CYS
9
n
9
CYS
9
D
ALA
10
n
10
ALA
10
D
GLU
11
n
11
GLU
11
D
TYR
12
n
12
TYR
12
D
HIS
13
n
13
HIS
13
D
ASN
14
n
14
ASN
14
D
THR
15
n
15
THR
15
D
GLN
16
n
16
GLN
16
D
ILE
17
n
17
ILE
17
D
HIS
18
n
18
HIS
18
D
THR
19
n
19
THR
19
D
LEU
20
n
20
LEU
20
D
ASN
21
n
21
ASN
21
D
ASP
22
n
22
ASP
22
D
LYS
23
n
23
LYS
23
D
ILE
24
n
24
ILE
24
D
PHE
25
n
25
PHE
25
D
SER
26
n
26
SER
26
D
TYR
27
n
27
TYR
27
D
THR
28
n
28
THR
28
D
GLU
29
n
29
GLU
29
D
SER
30
n
30
SER
30
D
LEU
31
n
31
LEU
31
D
ALA
32
n
32
ALA
32
D
ASP
33
n
33
ASP
33
D
LYS
34
n
34
LYS
34
D
ARG
35
n
35
ARG
35
D
GLU
36
n
36
GLU
36
D
MET
37
n
37
MET
37
D
ALA
38
n
38
ALA
38
D
ILE
39
n
39
ILE
39
D
ILE
40
n
40
ILE
40
D
THR
41
n
41
THR
41
D
PHE
42
n
42
PHE
42
D
LYS
43
n
43
LYS
43
D
ASN
44
n
44
ASN
44
D
GLY
45
n
45
GLY
45
D
ALA
46
n
46
ALA
46
D
THR
47
n
47
THR
47
D
PHE
48
n
48
PHE
48
D
GLN
49
n
49
GLN
49
D
VAL
50
n
50
VAL
50
D
GLU
51
n
51
GLU
51
D
VAL
52
n
52
VAL
52
D
PRO
53
n
53
PRO
53
D
GLY
54
n
54
GLY
54
D
SER
55
n
55
SER
55
D
GLN
56
n
56
GLN
56
D
HIS
57
n
57
HIS
57
D
ILE
58
n
58
ILE
58
D
ASP
59
n
59
ASP
59
D
SER
60
n
60
SER
60
D
GLN
61
n
61
GLN
61
D
LYS
62
n
62
LYS
62
D
LYS
63
n
63
LYS
63
D
ALA
64
n
64
ALA
64
D
ILE
65
n
65
ILE
65
D
GLU
66
n
66
GLU
66
D
ARG
67
n
67
ARG
67
D
MET
68
n
68
MET
68
D
LYS
69
n
69
LYS
69
D
ASP
70
n
70
ASP
70
D
THR
71
n
71
THR
71
D
LEU
72
n
72
LEU
72
D
ARG
73
n
73
ARG
73
D
ILE
74
n
74
ILE
74
D
ALA
75
n
75
ALA
75
D
TYR
76
n
76
TYR
76
D
LEU
77
n
77
LEU
77
D
THR
78
n
78
THR
78
D
GLU
79
n
79
GLU
79
D
ALA
80
n
80
ALA
80
D
LYS
81
n
81
LYS
81
D
VAL
82
n
82
VAL
82
D
GLU
83
n
83
GLU
83
D
LYS
84
n
84
LYS
84
D
LEU
85
n
85
LEU
85
D
CYS
86
n
86
CYS
86
D
VAL
87
n
87
VAL
87
D
TRP
88
n
88
TRP
88
D
ASN
89
n
89
ASN
89
D
ASN
90
n
90
ASN
90
D
LYS
91
n
91
LYS
91
D
THR
92
n
92
THR
92
D
PRO
93
n
93
PRO
93
D
HIS
94
n
94
HIS
94
D
ALA
95
n
95
ALA
95
D
ILE
96
n
96
ILE
96
D
ALA
97
n
97
ALA
97
D
ALA
98
n
98
ALA
98
D
ILE
99
n
99
ILE
99
D
SER
100
n
100
SER
100
D
MET
101
n
101
MET
101
D
ALA
102
n
102
ALA
102
D
ASN
103
n
103
ASN
103
D
THR
1
n
1
THR
1
E
PRO
2
n
2
PRO
2
E
GLN
3
n
3
GLN
3
E
ASN
4
n
4
ASN
4
E
ILE
5
n
5
ILE
5
E
THR
6
n
6
THR
6
E
ASP
7
n
7
ASP
7
E
LEU
8
n
8
LEU
8
E
CYS
9
n
9
CYS
9
E
ALA
10
n
10
ALA
10
E
GLU
11
n
11
GLU
11
E
TYR
12
n
12
TYR
12
E
HIS
13
n
13
HIS
13
E
ASN
14
n
14
ASN
14
E
THR
15
n
15
THR
15
E
GLN
16
n
16
GLN
16
E
ILE
17
n
17
ILE
17
E
HIS
18
n
18
HIS
18
E
THR
19
n
19
THR
19
E
LEU
20
n
20
LEU
20
E
ASN
21
n
21
ASN
21
E
ASP
22
n
22
ASP
22
E
LYS
23
n
23
LYS
23
E
ILE
24
n
24
ILE
24
E
PHE
25
n
25
PHE
25
E
SER
26
n
26
SER
26
E
TYR
27
n
27
TYR
27
E
THR
28
n
28
THR
28
E
GLU
29
n
29
GLU
29
E
SER
30
n
30
SER
30
E
LEU
31
n
31
LEU
31
E
ALA
32
n
32
ALA
32
E
ASP
33
n
33
ASP
33
E
LYS
34
n
34
LYS
34
E
ARG
35
n
35
ARG
35
E
GLU
36
n
36
GLU
36
E
MET
37
n
37
MET
37
E
ALA
38
n
38
ALA
38
E
ILE
39
n
39
ILE
39
E
ILE
40
n
40
ILE
40
E
THR
41
n
41
THR
41
E
PHE
42
n
42
PHE
42
E
LYS
43
n
43
LYS
43
E
ASN
44
n
44
ASN
44
E
GLY
45
n
45
GLY
45
E
ALA
46
n
46
ALA
46
E
THR
47
n
47
THR
47
E
PHE
48
n
48
PHE
48
E
GLN
49
n
49
GLN
49
E
VAL
50
n
50
VAL
50
E
GLU
51
n
51
GLU
51
E
VAL
52
n
52
VAL
52
E
PRO
53
n
53
PRO
53
E
GLY
54
n
54
GLY
54
E
SER
55
n
55
SER
55
E
GLN
56
n
56
GLN
56
E
HIS
57
n
57
HIS
57
E
ILE
58
n
58
ILE
58
E
ASP
59
n
59
ASP
59
E
SER
60
n
60
SER
60
E
GLN
61
n
61
GLN
61
E
LYS
62
n
62
LYS
62
E
LYS
63
n
63
LYS
63
E
ALA
64
n
64
ALA
64
E
ILE
65
n
65
ILE
65
E
GLU
66
n
66
GLU
66
E
ARG
67
n
67
ARG
67
E
MET
68
n
68
MET
68
E
LYS
69
n
69
LYS
69
E
ASP
70
n
70
ASP
70
E
THR
71
n
71
THR
71
E
LEU
72
n
72
LEU
72
E
ARG
73
n
73
ARG
73
E
ILE
74
n
74
ILE
74
E
ALA
75
n
75
ALA
75
E
TYR
76
n
76
TYR
76
E
LEU
77
n
77
LEU
77
E
THR
78
n
78
THR
78
E
GLU
79
n
79
GLU
79
E
ALA
80
n
80
ALA
80
E
LYS
81
n
81
LYS
81
E
VAL
82
n
82
VAL
82
E
GLU
83
n
83
GLU
83
E
LYS
84
n
84
LYS
84
E
LEU
85
n
85
LEU
85
E
CYS
86
n
86
CYS
86
E
VAL
87
n
87
VAL
87
E
TRP
88
n
88
TRP
88
E
ASN
89
n
89
ASN
89
E
ASN
90
n
90
ASN
90
E
LYS
91
n
91
LYS
91
E
THR
92
n
92
THR
92
E
PRO
93
n
93
PRO
93
E
HIS
94
n
94
HIS
94
E
ALA
95
n
95
ALA
95
E
ILE
96
n
96
ILE
96
E
ALA
97
n
97
ALA
97
E
ALA
98
n
98
ALA
98
E
ILE
99
n
99
ILE
99
E
SER
100
n
100
SER
100
E
MET
101
n
101
MET
101
E
ALA
102
n
102
ALA
102
E
ASN
103
n
103
ASN
103
E
THR
1
n
1
THR
1
F
PRO
2
n
2
PRO
2
F
GLN
3
n
3
GLN
3
F
ASN
4
n
4
ASN
4
F
ILE
5
n
5
ILE
5
F
THR
6
n
6
THR
6
F
ASP
7
n
7
ASP
7
F
LEU
8
n
8
LEU
8
F
CYS
9
n
9
CYS
9
F
ALA
10
n
10
ALA
10
F
GLU
11
n
11
GLU
11
F
TYR
12
n
12
TYR
12
F
HIS
13
n
13
HIS
13
F
ASN
14
n
14
ASN
14
F
THR
15
n
15
THR
15
F
GLN
16
n
16
GLN
16
F
ILE
17
n
17
ILE
17
F
HIS
18
n
18
HIS
18
F
THR
19
n
19
THR
19
F
LEU
20
n
20
LEU
20
F
ASN
21
n
21
ASN
21
F
ASP
22
n
22
ASP
22
F
LYS
23
n
23
LYS
23
F
ILE
24
n
24
ILE
24
F
PHE
25
n
25
PHE
25
F
SER
26
n
26
SER
26
F
TYR
27
n
27
TYR
27
F
THR
28
n
28
THR
28
F
GLU
29
n
29
GLU
29
F
SER
30
n
30
SER
30
F
LEU
31
n
31
LEU
31
F
ALA
32
n
32
ALA
32
F
ASP
33
n
33
ASP
33
F
LYS
34
n
34
LYS
34
F
ARG
35
n
35
ARG
35
F
GLU
36
n
36
GLU
36
F
MET
37
n
37
MET
37
F
ALA
38
n
38
ALA
38
F
ILE
39
n
39
ILE
39
F
ILE
40
n
40
ILE
40
F
THR
41
n
41
THR
41
F
PHE
42
n
42
PHE
42
F
LYS
43
n
43
LYS
43
F
ASN
44
n
44
ASN
44
F
GLY
45
n
45
GLY
45
F
ALA
46
n
46
ALA
46
F
THR
47
n
47
THR
47
F
PHE
48
n
48
PHE
48
F
GLN
49
n
49
GLN
49
F
VAL
50
n
50
VAL
50
F
GLU
51
n
51
GLU
51
F
VAL
52
n
52
VAL
52
F
PRO
53
n
53
PRO
53
F
GLY
54
n
54
GLY
54
F
SER
55
n
55
SER
55
F
GLN
56
n
56
GLN
56
F
HIS
57
n
57
HIS
57
F
ILE
58
n
58
ILE
58
F
ASP
59
n
59
ASP
59
F
SER
60
n
60
SER
60
F
GLN
61
n
61
GLN
61
F
LYS
62
n
62
LYS
62
F
LYS
63
n
63
LYS
63
F
ALA
64
n
64
ALA
64
F
ILE
65
n
65
ILE
65
F
GLU
66
n
66
GLU
66
F
ARG
67
n
67
ARG
67
F
MET
68
n
68
MET
68
F
LYS
69
n
69
LYS
69
F
ASP
70
n
70
ASP
70
F
THR
71
n
71
THR
71
F
LEU
72
n
72
LEU
72
F
ARG
73
n
73
ARG
73
F
ILE
74
n
74
ILE
74
F
ALA
75
n
75
ALA
75
F
TYR
76
n
76
TYR
76
F
LEU
77
n
77
LEU
77
F
THR
78
n
78
THR
78
F
GLU
79
n
79
GLU
79
F
ALA
80
n
80
ALA
80
F
LYS
81
n
81
LYS
81
F
VAL
82
n
82
VAL
82
F
GLU
83
n
83
GLU
83
F
LYS
84
n
84
LYS
84
F
LEU
85
n
85
LEU
85
F
CYS
86
n
86
CYS
86
F
VAL
87
n
87
VAL
87
F
TRP
88
n
88
TRP
88
F
ASN
89
n
89
ASN
89
F
ASN
90
n
90
ASN
90
F
LYS
91
n
91
LYS
91
F
THR
92
n
92
THR
92
F
PRO
93
n
93
PRO
93
F
HIS
94
n
94
HIS
94
F
ALA
95
n
95
ALA
95
F
ILE
96
n
96
ILE
96
F
ALA
97
n
97
ALA
97
F
ALA
98
n
98
ALA
98
F
ILE
99
n
99
ILE
99
F
SER
100
n
100
SER
100
F
MET
101
n
101
MET
101
F
ALA
102
n
102
ALA
102
F
ASN
103
n
103
ASN
103
F
THR
1
n
1
THR
1
G
PRO
2
n
2
PRO
2
G
GLN
3
n
3
GLN
3
G
ASN
4
n
4
ASN
4
G
ILE
5
n
5
ILE
5
G
THR
6
n
6
THR
6
G
ASP
7
n
7
ASP
7
G
LEU
8
n
8
LEU
8
G
CYS
9
n
9
CYS
9
G
ALA
10
n
10
ALA
10
G
GLU
11
n
11
GLU
11
G
TYR
12
n
12
TYR
12
G
HIS
13
n
13
HIS
13
G
ASN
14
n
14
ASN
14
G
THR
15
n
15
THR
15
G
GLN
16
n
16
GLN
16
G
ILE
17
n
17
ILE
17
G
HIS
18
n
18
HIS
18
G
THR
19
n
19
THR
19
G
LEU
20
n
20
LEU
20
G
ASN
21
n
21
ASN
21
G
ASP
22
n
22
ASP
22
G
LYS
23
n
23
LYS
23
G
ILE
24
n
24
ILE
24
G
PHE
25
n
25
PHE
25
G
SER
26
n
26
SER
26
G
TYR
27
n
27
TYR
27
G
THR
28
n
28
THR
28
G
GLU
29
n
29
GLU
29
G
SER
30
n
30
SER
30
G
LEU
31
n
31
LEU
31
G
ALA
32
n
32
ALA
32
G
ASP
33
n
33
ASP
33
G
LYS
34
n
34
LYS
34
G
ARG
35
n
35
ARG
35
G
GLU
36
n
36
GLU
36
G
MET
37
n
37
MET
37
G
ALA
38
n
38
ALA
38
G
ILE
39
n
39
ILE
39
G
ILE
40
n
40
ILE
40
G
THR
41
n
41
THR
41
G
PHE
42
n
42
PHE
42
G
LYS
43
n
43
LYS
43
G
ASN
44
n
44
ASN
44
G
GLY
45
n
45
GLY
45
G
ALA
46
n
46
ALA
46
G
THR
47
n
47
THR
47
G
PHE
48
n
48
PHE
48
G
GLN
49
n
49
GLN
49
G
VAL
50
n
50
VAL
50
G
GLU
51
n
51
GLU
51
G
VAL
52
n
52
VAL
52
G
PRO
53
n
53
PRO
53
G
GLY
54
n
54
GLY
54
G
SER
55
n
55
SER
55
G
GLN
56
n
56
GLN
56
G
HIS
57
n
57
HIS
57
G
ILE
58
n
58
ILE
58
G
ASP
59
n
59
ASP
59
G
SER
60
n
60
SER
60
G
GLN
61
n
61
GLN
61
G
LYS
62
n
62
LYS
62
G
LYS
63
n
63
LYS
63
G
ALA
64
n
64
ALA
64
G
ILE
65
n
65
ILE
65
G
GLU
66
n
66
GLU
66
G
ARG
67
n
67
ARG
67
G
MET
68
n
68
MET
68
G
LYS
69
n
69
LYS
69
G
ASP
70
n
70
ASP
70
G
THR
71
n
71
THR
71
G
LEU
72
n
72
LEU
72
G
ARG
73
n
73
ARG
73
G
ILE
74
n
74
ILE
74
G
ALA
75
n
75
ALA
75
G
TYR
76
n
76
TYR
76
G
LEU
77
n
77
LEU
77
G
THR
78
n
78
THR
78
G
GLU
79
n
79
GLU
79
G
ALA
80
n
80
ALA
80
G
LYS
81
n
81
LYS
81
G
VAL
82
n
82
VAL
82
G
GLU
83
n
83
GLU
83
G
LYS
84
n
84
LYS
84
G
LEU
85
n
85
LEU
85
G
CYS
86
n
86
CYS
86
G
VAL
87
n
87
VAL
87
G
TRP
88
n
88
TRP
88
G
ASN
89
n
89
ASN
89
G
ASN
90
n
90
ASN
90
G
LYS
91
n
91
LYS
91
G
THR
92
n
92
THR
92
G
PRO
93
n
93
PRO
93
G
HIS
94
n
94
HIS
94
G
ALA
95
n
95
ALA
95
G
ILE
96
n
96
ILE
96
G
ALA
97
n
97
ALA
97
G
ALA
98
n
98
ALA
98
G
ILE
99
n
99
ILE
99
G
SER
100
n
100
SER
100
G
MET
101
n
101
MET
101
G
ALA
102
n
102
ALA
102
G
ASN
103
n
103
ASN
103
G
THR
1
n
1
THR
1
H
PRO
2
n
2
PRO
2
H
GLN
3
n
3
GLN
3
H
ASN
4
n
4
ASN
4
H
ILE
5
n
5
ILE
5
H
THR
6
n
6
THR
6
H
ASP
7
n
7
ASP
7
H
LEU
8
n
8
LEU
8
H
CYS
9
n
9
CYS
9
H
ALA
10
n
10
ALA
10
H
GLU
11
n
11
GLU
11
H
TYR
12
n
12
TYR
12
H
HIS
13
n
13
HIS
13
H
ASN
14
n
14
ASN
14
H
THR
15
n
15
THR
15
H
GLN
16
n
16
GLN
16
H
ILE
17
n
17
ILE
17
H
HIS
18
n
18
HIS
18
H
THR
19
n
19
THR
19
H
LEU
20
n
20
LEU
20
H
ASN
21
n
21
ASN
21
H
ASP
22
n
22
ASP
22
H
LYS
23
n
23
LYS
23
H
ILE
24
n
24
ILE
24
H
PHE
25
n
25
PHE
25
H
SER
26
n
26
SER
26
H
TYR
27
n
27
TYR
27
H
THR
28
n
28
THR
28
H
GLU
29
n
29
GLU
29
H
SER
30
n
30
SER
30
H
LEU
31
n
31
LEU
31
H
ALA
32
n
32
ALA
32
H
ASP
33
n
33
ASP
33
H
LYS
34
n
34
LYS
34
H
ARG
35
n
35
ARG
35
H
GLU
36
n
36
GLU
36
H
MET
37
n
37
MET
37
H
ALA
38
n
38
ALA
38
H
ILE
39
n
39
ILE
39
H
ILE
40
n
40
ILE
40
H
THR
41
n
41
THR
41
H
PHE
42
n
42
PHE
42
H
LYS
43
n
43
LYS
43
H
ASN
44
n
44
ASN
44
H
GLY
45
n
45
GLY
45
H
ALA
46
n
46
ALA
46
H
THR
47
n
47
THR
47
H
PHE
48
n
48
PHE
48
H
GLN
49
n
49
GLN
49
H
VAL
50
n
50
VAL
50
H
GLU
51
n
51
GLU
51
H
VAL
52
n
52
VAL
52
H
PRO
53
n
53
PRO
53
H
GLY
54
n
54
GLY
54
H
SER
55
n
55
SER
55
H
GLN
56
n
56
GLN
56
H
HIS
57
n
57
HIS
57
H
ILE
58
n
58
ILE
58
H
ASP
59
n
59
ASP
59
H
SER
60
n
60
SER
60
H
GLN
61
n
61
GLN
61
H
LYS
62
n
62
LYS
62
H
LYS
63
n
63
LYS
63
H
ALA
64
n
64
ALA
64
H
ILE
65
n
65
ILE
65
H
GLU
66
n
66
GLU
66
H
ARG
67
n
67
ARG
67
H
MET
68
n
68
MET
68
H
LYS
69
n
69
LYS
69
H
ASP
70
n
70
ASP
70
H
THR
71
n
71
THR
71
H
LEU
72
n
72
LEU
72
H
ARG
73
n
73
ARG
73
H
ILE
74
n
74
ILE
74
H
ALA
75
n
75
ALA
75
H
TYR
76
n
76
TYR
76
H
LEU
77
n
77
LEU
77
H
THR
78
n
78
THR
78
H
GLU
79
n
79
GLU
79
H
ALA
80
n
80
ALA
80
H
LYS
81
n
81
LYS
81
H
VAL
82
n
82
VAL
82
H
GLU
83
n
83
GLU
83
H
LYS
84
n
84
LYS
84
H
LEU
85
n
85
LEU
85
H
CYS
86
n
86
CYS
86
H
VAL
87
n
87
VAL
87
H
TRP
88
n
88
TRP
88
H
ASN
89
n
89
ASN
89
H
ASN
90
n
90
ASN
90
H
LYS
91
n
91
LYS
91
H
THR
92
n
92
THR
92
H
PRO
93
n
93
PRO
93
H
HIS
94
n
94
HIS
94
H
ALA
95
n
95
ALA
95
H
ILE
96
n
96
ILE
96
H
ALA
97
n
97
ALA
97
H
ALA
98
n
98
ALA
98
H
ILE
99
n
99
ILE
99
H
SER
100
n
100
SER
100
H
MET
101
n
101
MET
101
H
ALA
102
n
102
ALA
102
H
ASN
103
n
103
ASN
103
H
author_and_software_defined_assembly
PISA
5
pentameric
12830
-45
20670
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
17.04
2.30
115.30
132.34
F
F
F
CA
CB
CG
LEU
LEU
LEU
31
31
31
N
1
14.12
2.30
115.30
129.42
G
G
G
CA
CB
CG
LEU
LEU
LEU
31
31
31
N
1
14.40
2.30
115.30
129.70
H
H
H
CA
CB
CG
LEU
LEU
LEU
31
31
31
N
1
D
LYS
34
69.51
-0.12
1
E
LYS
34
58.98
16.90
1
E
ARG
35
-141.54
34.63
1
F
GLN
56
-69.76
24.19
1
F
ILE
58
-69.42
-148.26
1
G
LYS
34
74.91
-1.64
1
H
ASN
44
-68.51
3.17
1
H
SER
55
-81.01
42.23
21.5
0.178
0.178
2.0
12.0
28286
83.3
1
3.0
2.0
12.0
248
4339
1
0
4090
0.011
1.66
1CHP
32710
0.0
0.081
1
2.85
99.
data collection
XENGEN
model building
X-PLOR
refinement
X-PLOR
data reduction
XENGEN
phasing
X-PLOR
SURPRISING LEADS FOR A CHOLERA TOXIN RECEPTOR BINDING ANTAGONIST; CRYSTALLOGRAPHIC STUDIES OF CTB MUTANTS
1
N
N
1
N
N
1
N
N
1
N
N
1
N
N
2
N
N
3
N
N
3
N
N
3
N
N
3
N
N
3
N
N
CHOLERA TOXIN IS AN AB5 HEXAMER. THE B-PENTAMER OF
CHOLERA TOXIN IS RESPONSIBLE FOR RECEPTOR RECOGNITION AND
BINDING.
D
ILE
5
A
ILE
5
HELX_P
D
CYS
9
A
CYS
9
1
DA1
5
D
ASP
59
A
ASP
59
HELX_P
D
THR
78
A
THR
78
1
DA2
20
E
ILE
5
B
ILE
5
HELX_P
E
CYS
9
B
CYS
9
1
EA1
5
E
LYS
62
B
LYS
62
HELX_P
E
THR
78
B
THR
78
1
EA2
17
F
ILE
5
C
ILE
5
HELX_P
F
CYS
9
C
CYS
9
1
FA1
5
F
ASP
59
C
ASP
59
HELX_P
F
THR
78
C
THR
78
1
FA2
20
G
ILE
5
D
ILE
5
HELX_P
G
CYS
9
D
CYS
9
1
GA1
5
G
GLN
61
D
GLN
61
HELX_P
G
THR
78
D
THR
78
1
HA2
18
H
ILE
5
E
ILE
5
HELX_P
H
CYS
9
E
CYS
9
1
GA1
5
H
SER
60
E
SER
60
HELX_P
H
THR
78
E
THR
78
1
HA2
19
disulf
2.023
D
CYS
9
A
SG
CYS
9
1_555
D
CYS
86
A
SG
CYS
86
1_555
disulf
2.024
E
CYS
9
B
SG
CYS
9
1_555
E
CYS
86
B
SG
CYS
86
1_555
disulf
2.018
F
CYS
9
C
SG
CYS
9
1_555
F
CYS
86
C
SG
CYS
86
1_555
disulf
2.025
G
CYS
9
D
SG
CYS
9
1_555
G
CYS
86
D
SG
CYS
86
1_555
disulf
2.030
H
CYS
9
E
SG
CYS
9
1_555
H
CYS
86
E
SG
CYS
86
1_555
TOXIN
TOXIN
D
THR
92
A
THR
92
1
D
PRO
93
A
PRO
93
-0.14
E
THR
92
B
THR
92
1
E
PRO
93
B
PRO
93
0.31
F
THR
92
C
THR
92
1
F
PRO
93
C
PRO
93
-0.05
G
THR
92
D
THR
92
1
G
PRO
93
D
PRO
93
-0.22
H
THR
92
E
THR
92
1
H
PRO
93
E
PRO
93
-0.85
CHTB_VIBCH
UNP
1
1
P01556
MIKLKFGVFFTVLLSSAYAHGTPQNITDLCAEYHNTQIYTLNDKIFSYTESLAGKREMAIITFKNGAIFQVEVPGSQHID
SQKKAIERMKDTLRIAYLTEAKVEKLCVWNNKTPHAIAAISMAN
22
124
1CHP
1
103
P01556
D
1
1
103
22
124
1CHP
1
103
P01556
E
1
1
103
22
124
1CHP
1
103
P01556
F
1
1
103
22
124
1CHP
1
103
P01556
G
1
1
103
22
124
1CHP
1
103
P01556
H
1
1
103
1
TYR
conflict
HIS
18
1CHP
D
P01556
UNP
39
18
1
GLY
engineered mutation
ASP
33
1CHP
D
P01556
UNP
54
33
1
ILE
conflict
THR
47
1CHP
D
P01556
UNP
68
47
2
TYR
conflict
HIS
18
1CHP
E
P01556
UNP
39
18
2
GLY
engineered mutation
ASP
33
1CHP
E
P01556
UNP
54
33
2
ILE
conflict
THR
47
1CHP
E
P01556
UNP
68
47
3
TYR
conflict
HIS
18
1CHP
F
P01556
UNP
39
18
3
GLY
engineered mutation
ASP
33
1CHP
F
P01556
UNP
54
33
3
ILE
conflict
THR
47
1CHP
F
P01556
UNP
68
47
4
TYR
conflict
HIS
18
1CHP
G
P01556
UNP
39
18
4
GLY
engineered mutation
ASP
33
1CHP
G
P01556
UNP
54
33
4
ILE
conflict
THR
47
1CHP
G
P01556
UNP
68
47
5
TYR
conflict
HIS
18
1CHP
H
P01556
UNP
39
18
5
GLY
engineered mutation
ASP
33
1CHP
H
P01556
UNP
54
33
5
ILE
conflict
THR
47
1CHP
H
P01556
UNP
68
47
6
6
6
6
6
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
D
THR
15
A
THR
15
D
ASP
22
A
ASP
22
D
VAL
82
A
VAL
82
D
TRP
88
A
TRP
88
D
HIS
94
A
HIS
94
D
ALA
102
A
ALA
102
E
SER
26
B
SER
26
E
SER
30
B
SER
30
E
MET
37
B
MET
37
E
THR
41
B
THR
41
E
THR
47
B
THR
47
E
VAL
50
B
VAL
50
E
THR
15
B
THR
15
E
ASP
22
B
ASP
22
E
VAL
82
B
VAL
82
E
TRP
88
B
TRP
88
E
HIS
94
B
HIS
94
E
ALA
102
B
ALA
102
F
SER
26
C
SER
26
F
SER
30
C
SER
30
F
MET
37
C
MET
37
F
THR
41
C
THR
41
F
THR
47
C
THR
47
F
VAL
50
C
VAL
50
F
THR
15
C
THR
15
F
ASP
22
C
ASP
22
F
VAL
82
C
VAL
82
F
TRP
88
C
TRP
88
F
HIS
94
C
HIS
94
F
ALA
102
C
ALA
102
G
SER
26
D
SER
26
G
SER
30
D
SER
30
G
MET
37
D
MET
37
G
THR
41
D
THR
41
G
THR
47
D
THR
47
G
VAL
50
D
VAL
50
G
THR
15
D
THR
15
G
ASP
22
D
ASP
22
G
VAL
82
D
VAL
82
G
TRP
88
D
TRP
88
G
HIS
94
D
HIS
94
G
ALA
102
D
ALA
102
H
SER
26
E
SER
26
H
SER
30
E
SER
30
H
MET
37
E
MET
37
H
THR
41
E
THR
41
H
THR
47
E
THR
47
H
VAL
50
E
VAL
50
H
THR
15
E
THR
15
H
ASP
22
E
ASP
22
H
VAL
82
E
VAL
82
H
TRP
88
E
TRP
88
H
HIS
94
E
HIS
94
H
ALA
102
E
ALA
102
D
SER
26
A
SER
26
D
SER
30
A
SER
30
D
MET
37
A
MET
37
D
THR
41
A
THR
41
D
THR
47
A
THR
47
D
VAL
50
A
VAL
50
BINDING SITE FOR RESIDUE CL H 249
H
CL
249
Software
5
D
HIS
13
A
HIS
13
5
4_656
H
TYR
12
E
TYR
12
5
1_555
H
HIS
13
E
HIS
13
5
1_555
H
TRP
88
E
TRP
88
5
1_555
H
HOH
255
K
HOH
5
1_555
5
C 1 2 1