0.008354
0.000000
0.000000
0.000000
0.009891
0.000000
0.000000
0.000000
0.015576
0.00000
0.00000
0.00000
Van Den Akker, F.
Hol, W.G.J.
http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic
20
90.00
90.00
90.00
119.700
101.100
64.200
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
C6 H12 O6
180.156
beta-D-glucopyranose
beta-D-glucose; D-glucose; glucose
D-saccharide, beta linking
C3 H7 N O2 S
121.158
y
CYSTEINE
L-peptide linking
C6 H12 O6
180.156
beta-D-galactopyranose
beta-D-galactose; D-galactose; galactose
D-saccharide, beta 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
US
Protein Sci.
PRCIEI
0795
0961-8368
6
2644
2649
9416616
Crystal structure of heat-labile enterotoxin from Escherichia coli with increased thermostability introduced by an engineered disulfide bond in the A subunit.
1997
UK
J.Mol.Biol.
JMOBAK
0070
0022-2836
230
890
Refined Structure of Escherichia Coli Heat-Labile Enterotoxin, a Close Relative of Cholera Toxin
1993
UK
Nature
NATUAS
0006
0028-0836
351
371
Crystal Structure of a Cholera Toxin-Related Heat-Labile Enterotoxin from E. Coli
1991
10.2210/pdb1lt3/pdb
pdb_00001lt3
1.000000
0.000000
0.000000
0.000000
1.000000
0.000000
0.000000
0.000000
1.000000
0.00000
0.00000
0.00000
295
1
MIRRORS
IMAGE PLATE
1996-09
RIGAKU RAXIS IV
NI FILTER
M
x-ray
1
1.5418
1.0
1.5418
ROTATING ANODE
RIGAKU RUH2R
LACTOSE BOUND
11807.539
HEAT-LABILE ENTEROTOXIN
HOLOTOXIN
N40C, G166C
5
man
polymer
LACTOSE BOUND
27886.736
HEAT-LABILE ENTEROTOXIN
HOLOTOXIN
N40C, G166C
1
man
polymer
342.297
beta-D-galactopyranose-(1-4)-beta-D-glucopyranose
5
man
branched
LT-I
LT-I
beta-lactose
no
no
APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTET
KIDKLCVWNNKTPNSIAAISMKN
APQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHIDSQKKAIERMKDTLRITYLTET
KIDKLCVWNNKTPNSIAAISMKN
D,E,F,G,H
polypeptide(L)
no
no
NGDRLYRADSRPPDEIKRSGGLMPRGHNEYFDRGTQMNICLYDHARGTQTGFVRYDDGYVSTSLSLRSAHLAGQSILSGY
STYYIYVIATAPNMFNVNDVLGVYSPHPYEQEVSALGGIPYSQIYGWYRVNFGVIDERLHRNREYRDRYYRNLNIAPAED
GYRLACFPPDHQAWREEPWIHHAPQGCGNSSRTITGDTCNEETQNLSTIYLREYQSKVKRQIFSDYQSEVDIYNRIRDEL
NGDRLYRADSRPPDEIKRSGGLMPRGHNEYFDRGTQMNICLYDHARGTQTGFVRYDDGYVSTSLSLRSAHLAGQSILSGY
STYYIYVIATAPNMFNVNDVLGVYSPHPYEQEVSALGGIPYSQIYGWYRVNFGVIDERLHRNREYRDRYYRNLNIAPAED
GYRLACFPPDHQAWREEPWIHHAPQGCGNSSRTITGDTCNEETQNLSTIYLREYQSKVKRQIFSDYQSEVDIYNRIRDEL
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
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Escherichia
PORCINE
Escherichia
sample
562
Escherichia coli
562
Escherichia coli
MC1061
PROFIT
Escherichia
PORCINE
Escherichia
sample
562
Escherichia coli
562
Escherichia coli
MC1061
PROFIT
1
2.23
44.94
NO MOLECULAR REPLACEMENT SEARCH NEEDED TO BE PERFORMED SINCE THE SPACE GROUP AND CELL DIMENSIONS WERE IDENTICAL TO THE STARTING 1LTT STRUCTURE.
3 layer capillary method
7.5
PROTEIN WAS CRYSTALLIZED FROM 5% PEG 6000, 100 MM NACL, 1 MM EDTA, 75 MM LACTOSE, 100 MM TRIS PH 7.5 USING THE 3 LAYER CAPPILARY METHOD, 3 layer capillary method
atom_site
chem_comp
entity
entity_name_com
pdbx_branch_scheme
pdbx_chem_comp_identifier
pdbx_entity_branch
pdbx_entity_branch_descriptor
pdbx_entity_branch_link
pdbx_entity_branch_list
pdbx_entity_nonpoly
pdbx_molecule_features
pdbx_nonpoly_scheme
pdbx_struct_assembly_gen
struct_asym
struct_conn
struct_site
struct_site_gen
chem_comp
database_2
struct_ref_seq_dif
pdbx_initial_refinement_model
repository
Initial release
Carbohydrate remediation
repository
Remediation
Version format compliance
Version format compliance
Atomic model
Data collection
Derived calculations
Structure summary
Database references
Structure summary
Refinement description
1
0
1997-07-07
1
1
2008-03-24
1
2
2011-07-13
2
0
2020-07-29
2
1
2021-11-03
2
2
2023-08-09
_atom_site.B_iso_or_equiv
_atom_site.Cartn_x
_atom_site.Cartn_y
_atom_site.Cartn_z
_atom_site.auth_asym_id
_atom_site.auth_atom_id
_atom_site.auth_comp_id
_atom_site.auth_seq_id
_atom_site.label_asym_id
_atom_site.label_atom_id
_atom_site.label_comp_id
_atom_site.label_entity_id
_atom_site.type_symbol
_chem_comp.name
_chem_comp.type
_pdbx_struct_assembly_gen.asym_id_list
_struct_conn.pdbx_leaving_atom_flag
_struct_conn.ptnr1_auth_asym_id
_struct_conn.ptnr1_auth_comp_id
_struct_conn.ptnr1_auth_seq_id
_struct_conn.ptnr1_label_asym_id
_struct_conn.ptnr1_label_atom_id
_struct_conn.ptnr1_label_comp_id
_struct_conn.ptnr2_auth_asym_id
_struct_conn.ptnr2_auth_comp_id
_struct_conn.ptnr2_auth_seq_id
_struct_conn.ptnr2_label_asym_id
_struct_conn.ptnr2_label_atom_id
_struct_conn.ptnr2_label_comp_id
_chem_comp.pdbx_synonyms
_database_2.pdbx_DOI
_database_2.pdbx_database_accession
_struct_ref_seq_dif.details
D
BGC
105
n
B
BGC
1
D
GAL
104
n
B
GAL
2
E
BGC
105
n
C
BGC
1
E
GAL
104
n
C
GAL
2
F
BGC
105
n
I
BGC
1
F
GAL
104
n
I
GAL
2
G
BGC
105
n
J
BGC
1
G
GAL
104
n
J
GAL
2
H
BGC
105
n
K
BGC
1
H
GAL
104
n
K
GAL
2
DGlcpb
b-D-glucopyranose
b-D-Glcp
Glc
DGalpb
b-D-galactopyranose
b-D-Galp
Gal
Y
BNL
1997-04-12
REL
REL
oligosaccharide
DGalpb1-4DGlcpb1-ROH
3
GMML
1.0
Glycam Condensed Sequence
WURCS=2.0/2,2,1/[a2122h-1b_1-5][a2112h-1b_1-5]/1-2/a4-b1
3
PDB2Glycan
1.1.0
WURCS
[][b-D-Glcp]{[(4+1)][b-D-Galp]{}}
3
PDB-CARE
LINUCS
C1
O4
GAL
BGC
2
1
3
O1
HO4
sing
n
n
1LTT
PDB ENTRY 1LTT
PDB
experimental model
Nutrient
oligosaccharide
beta-lactose
Oligosaccharide
ALA
1
n
1
ALA
1
D
PRO
2
n
2
PRO
2
D
GLN
3
n
3
GLN
3
D
THR
4
n
4
THR
4
D
ILE
5
n
5
ILE
5
D
THR
6
n
6
THR
6
D
GLU
7
n
7
GLU
7
D
LEU
8
n
8
LEU
8
D
CYS
9
n
9
CYS
9
D
SER
10
n
10
SER
10
D
GLU
11
n
11
GLU
11
D
TYR
12
n
12
TYR
12
D
ARG
13
n
13
ARG
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
TYR
18
n
18
TYR
18
D
THR
19
n
19
THR
19
D
ILE
20
n
20
ILE
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
LEU
25
n
25
LEU
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
MET
31
n
31
MET
31
D
ALA
32
n
32
ALA
32
D
GLY
33
n
33
GLY
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
VAL
38
n
38
VAL
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
SER
44
n
44
SER
44
D
GLY
45
n
45
GLY
45
D
GLU
46
n
46
GLU
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
THR
75
n
75
THR
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
THR
80
n
80
THR
80
D
LYS
81
n
81
LYS
81
D
ILE
82
n
82
ILE
82
D
ASP
83
n
83
ASP
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
ASN
94
n
94
ASN
94
D
SER
95
n
95
SER
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
LYS
102
n
102
LYS
102
D
ASN
103
n
103
ASN
103
D
ALA
1
n
1
ALA
1
E
PRO
2
n
2
PRO
2
E
GLN
3
n
3
GLN
3
E
THR
4
n
4
THR
4
E
ILE
5
n
5
ILE
5
E
THR
6
n
6
THR
6
E
GLU
7
n
7
GLU
7
E
LEU
8
n
8
LEU
8
E
CYS
9
n
9
CYS
9
E
SER
10
n
10
SER
10
E
GLU
11
n
11
GLU
11
E
TYR
12
n
12
TYR
12
E
ARG
13
n
13
ARG
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
TYR
18
n
18
TYR
18
E
THR
19
n
19
THR
19
E
ILE
20
n
20
ILE
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
LEU
25
n
25
LEU
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
MET
31
n
31
MET
31
E
ALA
32
n
32
ALA
32
E
GLY
33
n
33
GLY
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
VAL
38
n
38
VAL
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
SER
44
n
44
SER
44
E
GLY
45
n
45
GLY
45
E
GLU
46
n
46
GLU
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
THR
75
n
75
THR
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
THR
80
n
80
THR
80
E
LYS
81
n
81
LYS
81
E
ILE
82
n
82
ILE
82
E
ASP
83
n
83
ASP
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
ASN
94
n
94
ASN
94
E
SER
95
n
95
SER
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
LYS
102
n
102
LYS
102
E
ASN
103
n
103
ASN
103
E
ALA
1
n
1
ALA
1
F
PRO
2
n
2
PRO
2
F
GLN
3
n
3
GLN
3
F
THR
4
n
4
THR
4
F
ILE
5
n
5
ILE
5
F
THR
6
n
6
THR
6
F
GLU
7
n
7
GLU
7
F
LEU
8
n
8
LEU
8
F
CYS
9
n
9
CYS
9
F
SER
10
n
10
SER
10
F
GLU
11
n
11
GLU
11
F
TYR
12
n
12
TYR
12
F
ARG
13
n
13
ARG
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
TYR
18
n
18
TYR
18
F
THR
19
n
19
THR
19
F
ILE
20
n
20
ILE
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
LEU
25
n
25
LEU
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
MET
31
n
31
MET
31
F
ALA
32
n
32
ALA
32
F
GLY
33
n
33
GLY
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
VAL
38
n
38
VAL
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
SER
44
n
44
SER
44
F
GLY
45
n
45
GLY
45
F
GLU
46
n
46
GLU
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
THR
75
n
75
THR
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
THR
80
n
80
THR
80
F
LYS
81
n
81
LYS
81
F
ILE
82
n
82
ILE
82
F
ASP
83
n
83
ASP
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
ASN
94
n
94
ASN
94
F
SER
95
n
95
SER
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
LYS
102
n
102
LYS
102
F
ASN
103
n
103
ASN
103
F
ALA
1
n
1
ALA
1
G
PRO
2
n
2
PRO
2
G
GLN
3
n
3
GLN
3
G
THR
4
n
4
THR
4
G
ILE
5
n
5
ILE
5
G
THR
6
n
6
THR
6
G
GLU
7
n
7
GLU
7
G
LEU
8
n
8
LEU
8
G
CYS
9
n
9
CYS
9
G
SER
10
n
10
SER
10
G
GLU
11
n
11
GLU
11
G
TYR
12
n
12
TYR
12
G
ARG
13
n
13
ARG
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
TYR
18
n
18
TYR
18
G
THR
19
n
19
THR
19
G
ILE
20
n
20
ILE
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
LEU
25
n
25
LEU
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
MET
31
n
31
MET
31
G
ALA
32
n
32
ALA
32
G
GLY
33
n
33
GLY
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
VAL
38
n
38
VAL
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
SER
44
n
44
SER
44
G
GLY
45
n
45
GLY
45
G
GLU
46
n
46
GLU
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
THR
75
n
75
THR
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
THR
80
n
80
THR
80
G
LYS
81
n
81
LYS
81
G
ILE
82
n
82
ILE
82
G
ASP
83
n
83
ASP
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
ASN
94
n
94
ASN
94
G
SER
95
n
95
SER
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
LYS
102
n
102
LYS
102
G
ASN
103
n
103
ASN
103
G
ALA
1
n
1
ALA
1
H
PRO
2
n
2
PRO
2
H
GLN
3
n
3
GLN
3
H
THR
4
n
4
THR
4
H
ILE
5
n
5
ILE
5
H
THR
6
n
6
THR
6
H
GLU
7
n
7
GLU
7
H
LEU
8
n
8
LEU
8
H
CYS
9
n
9
CYS
9
H
SER
10
n
10
SER
10
H
GLU
11
n
11
GLU
11
H
TYR
12
n
12
TYR
12
H
ARG
13
n
13
ARG
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
TYR
18
n
18
TYR
18
H
THR
19
n
19
THR
19
H
ILE
20
n
20
ILE
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
LEU
25
n
25
LEU
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
MET
31
n
31
MET
31
H
ALA
32
n
32
ALA
32
H
GLY
33
n
33
GLY
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
VAL
38
n
38
VAL
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
SER
44
n
44
SER
44
H
GLY
45
n
45
GLY
45
H
GLU
46
n
46
GLU
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
THR
75
n
75
THR
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
THR
80
n
80
THR
80
H
LYS
81
n
81
LYS
81
H
ILE
82
n
82
ILE
82
H
ASP
83
n
83
ASP
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
ASN
94
n
94
ASN
94
H
SER
95
n
95
SER
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
LYS
102
n
102
LYS
102
H
ASN
103
n
103
ASN
103
H
n
1
1
A
n
2
2
A
n
3
3
A
ARG
4
n
4
ARG
4
A
LEU
5
n
5
LEU
5
A
TYR
6
n
6
TYR
6
A
ARG
7
n
7
ARG
7
A
ALA
8
n
8
ALA
8
A
ASP
9
n
9
ASP
9
A
SER
10
n
10
SER
10
A
ARG
11
n
11
ARG
11
A
PRO
12
n
12
PRO
12
A
PRO
13
n
13
PRO
13
A
ASP
14
n
14
ASP
14
A
GLU
15
n
15
GLU
15
A
ILE
16
n
16
ILE
16
A
LYS
17
n
17
LYS
17
A
ARG
18
n
18
ARG
18
A
SER
19
n
19
SER
19
A
GLY
20
n
20
GLY
20
A
GLY
21
n
21
GLY
21
A
LEU
22
n
22
LEU
22
A
MET
23
n
23
MET
23
A
PRO
24
n
24
PRO
24
A
ARG
25
n
25
ARG
25
A
GLY
26
n
26
GLY
26
A
HIS
27
n
27
HIS
27
A
ASN
28
n
28
ASN
28
A
GLU
29
n
29
GLU
29
A
TYR
30
n
30
TYR
30
A
PHE
31
n
31
PHE
31
A
ASP
32
n
32
ASP
32
A
ARG
33
n
33
ARG
33
A
GLY
34
n
34
GLY
34
A
THR
35
n
35
THR
35
A
GLN
36
n
36
GLN
36
A
MET
37
n
37
MET
37
A
ASN
38
n
38
ASN
38
A
ILE
39
n
39
ILE
39
A
CYS
40
n
40
CYS
40
A
LEU
41
n
41
LEU
41
A
TYR
42
n
42
TYR
42
A
ASP
43
n
43
ASP
43
A
HIS
44
n
44
HIS
44
A
ALA
45
n
45
ALA
45
A
ARG
46
n
46
ARG
46
A
GLY
47
n
47
GLY
47
A
THR
48
n
48
THR
48
A
GLN
49
n
49
GLN
49
A
THR
50
n
50
THR
50
A
GLY
51
n
51
GLY
51
A
PHE
52
n
52
PHE
52
A
VAL
53
n
53
VAL
53
A
ARG
54
n
54
ARG
54
A
TYR
55
n
55
TYR
55
A
ASP
56
n
56
ASP
56
A
ASP
57
n
57
ASP
57
A
GLY
58
n
58
GLY
58
A
TYR
59
n
59
TYR
59
A
VAL
60
n
60
VAL
60
A
SER
61
n
61
SER
61
A
THR
62
n
62
THR
62
A
SER
63
n
63
SER
63
A
LEU
64
n
64
LEU
64
A
SER
65
n
65
SER
65
A
LEU
66
n
66
LEU
66
A
ARG
67
n
67
ARG
67
A
SER
68
n
68
SER
68
A
ALA
69
n
69
ALA
69
A
HIS
70
n
70
HIS
70
A
LEU
71
n
71
LEU
71
A
ALA
72
n
72
ALA
72
A
GLY
73
n
73
GLY
73
A
GLN
74
n
74
GLN
74
A
SER
75
n
75
SER
75
A
ILE
76
n
76
ILE
76
A
LEU
77
n
77
LEU
77
A
SER
78
n
78
SER
78
A
GLY
79
n
79
GLY
79
A
TYR
80
n
80
TYR
80
A
SER
81
n
81
SER
81
A
THR
82
n
82
THR
82
A
TYR
83
n
83
TYR
83
A
TYR
84
n
84
TYR
84
A
ILE
85
n
85
ILE
85
A
TYR
86
n
86
TYR
86
A
VAL
87
n
87
VAL
87
A
ILE
88
n
88
ILE
88
A
ALA
89
n
89
ALA
89
A
THR
90
n
90
THR
90
A
ALA
91
n
91
ALA
91
A
PRO
92
n
92
PRO
92
A
ASN
93
n
93
ASN
93
A
MET
94
n
94
MET
94
A
PHE
95
n
95
PHE
95
A
ASN
96
n
96
ASN
96
A
VAL
97
n
97
VAL
97
A
ASN
98
n
98
ASN
98
A
ASP
99
n
99
ASP
99
A
VAL
100
n
100
VAL
100
A
LEU
101
n
101
LEU
101
A
GLY
102
n
102
GLY
102
A
VAL
103
n
103
VAL
103
A
TYR
104
n
104
TYR
104
A
SER
105
n
105
SER
105
A
PRO
106
n
106
PRO
106
A
HIS
107
n
107
HIS
107
A
PRO
108
n
108
PRO
108
A
TYR
109
n
109
TYR
109
A
GLU
110
n
110
GLU
110
A
GLN
111
n
111
GLN
111
A
GLU
112
n
112
GLU
112
A
VAL
113
n
113
VAL
113
A
SER
114
n
114
SER
114
A
ALA
115
n
115
ALA
115
A
LEU
116
n
116
LEU
116
A
GLY
117
n
117
GLY
117
A
GLY
118
n
118
GLY
118
A
ILE
119
n
119
ILE
119
A
PRO
120
n
120
PRO
120
A
TYR
121
n
121
TYR
121
A
SER
122
n
122
SER
122
A
GLN
123
n
123
GLN
123
A
ILE
124
n
124
ILE
124
A
TYR
125
n
125
TYR
125
A
GLY
126
n
126
GLY
126
A
TRP
127
n
127
TRP
127
A
TYR
128
n
128
TYR
128
A
ARG
129
n
129
ARG
129
A
VAL
130
n
130
VAL
130
A
ASN
131
n
131
ASN
131
A
PHE
132
n
132
PHE
132
A
GLY
133
n
133
GLY
133
A
VAL
134
n
134
VAL
134
A
ILE
135
n
135
ILE
135
A
ASP
136
n
136
ASP
136
A
GLU
137
n
137
GLU
137
A
ARG
138
n
138
ARG
138
A
LEU
139
n
139
LEU
139
A
HIS
140
n
140
HIS
140
A
ARG
141
n
141
ARG
141
A
ASN
142
n
142
ASN
142
A
ARG
143
n
143
ARG
143
A
GLU
144
n
144
GLU
144
A
TYR
145
n
145
TYR
145
A
ARG
146
n
146
ARG
146
A
ASP
147
n
147
ASP
147
A
ARG
148
n
148
ARG
148
A
TYR
149
n
149
TYR
149
A
TYR
150
n
150
TYR
150
A
ARG
151
n
151
ARG
151
A
ASN
152
n
152
ASN
152
A
LEU
153
n
153
LEU
153
A
ASN
154
n
154
ASN
154
A
ILE
155
n
155
ILE
155
A
ALA
156
n
156
ALA
156
A
PRO
157
n
157
PRO
157
A
ALA
158
n
158
ALA
158
A
GLU
159
n
159
GLU
159
A
ASP
160
n
160
ASP
160
A
GLY
161
n
161
GLY
161
A
TYR
162
n
162
TYR
162
A
ARG
163
n
163
ARG
163
A
LEU
164
n
164
LEU
164
A
ALA
165
n
165
ALA
165
A
CYS
166
n
166
CYS
166
A
PHE
167
n
167
PHE
167
A
PRO
168
n
168
PRO
168
A
PRO
169
n
169
PRO
169
A
ASP
170
n
170
ASP
170
A
HIS
171
n
171
HIS
171
A
GLN
172
n
172
GLN
172
A
ALA
173
n
173
ALA
173
A
TRP
174
n
174
TRP
174
A
ARG
175
n
175
ARG
175
A
GLU
176
n
176
GLU
176
A
GLU
177
n
177
GLU
177
A
PRO
178
n
178
PRO
178
A
TRP
179
n
179
TRP
179
A
ILE
180
n
180
ILE
180
A
HIS
181
n
181
HIS
181
A
HIS
182
n
182
HIS
182
A
ALA
183
n
183
ALA
183
A
PRO
184
n
184
PRO
184
A
GLN
185
n
185
GLN
185
A
GLY
186
n
186
GLY
186
A
CYS
187
n
187
CYS
187
A
GLY
188
n
188
GLY
188
A
n
189
189
A
n
190
190
A
n
191
191
A
n
192
192
A
n
193
193
A
n
194
194
A
n
195
195
A
GLY
196
n
196
GLY
196
A
ASP
197
n
197
ASP
197
A
THR
198
n
198
THR
198
A
CYS
199
n
199
CYS
199
A
ASN
200
n
200
ASN
200
A
GLU
201
n
201
GLU
201
A
GLU
202
n
202
GLU
202
A
THR
203
n
203
THR
203
A
GLN
204
n
204
GLN
204
A
ASN
205
n
205
ASN
205
A
LEU
206
n
206
LEU
206
A
SER
207
n
207
SER
207
A
THR
208
n
208
THR
208
A
ILE
209
n
209
ILE
209
A
TYR
210
n
210
TYR
210
A
LEU
211
n
211
LEU
211
A
ARG
212
n
212
ARG
212
A
GLU
213
n
213
GLU
213
A
TYR
214
n
214
TYR
214
A
GLN
215
n
215
GLN
215
A
SER
216
n
216
SER
216
A
LYS
217
n
217
LYS
217
A
VAL
218
n
218
VAL
218
A
LYS
219
n
219
LYS
219
A
ARG
220
n
220
ARG
220
A
GLN
221
n
221
GLN
221
A
ILE
222
n
222
ILE
222
A
PHE
223
n
223
PHE
223
A
SER
224
n
224
SER
224
A
ASP
225
n
225
ASP
225
A
TYR
226
n
226
TYR
226
A
GLN
227
n
227
GLN
227
A
SER
228
n
228
SER
228
A
GLU
229
n
229
GLU
229
A
VAL
230
n
230
VAL
230
A
ASP
231
n
231
ASP
231
A
ILE
232
n
232
ILE
232
A
TYR
233
n
233
TYR
233
A
ASN
234
n
234
ASN
234
A
ARG
235
n
235
ARG
235
A
ILE
236
n
236
ILE
236
A
n
237
237
A
n
238
238
A
n
239
239
A
n
240
240
A
author_and_software_defined_assembly
PISA
6
hexameric
20590
-28
28040
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
D
O
GLN
16
A
O
GLN
16
D
N
VAL
87
A
N
VAL
87
D
O
LYS
84
A
O
LYS
84
D
N
SER
100
A
N
SER
100
D
O
ILE
99
A
O
ILE
99
E
N
GLU
29
B
N
GLU
29
E
O
SER
26
B
O
SER
26
E
N
THR
41
B
N
THR
41
E
O
VAL
38
B
O
VAL
38
E
N
VAL
50
B
N
VAL
50
H
O
GLN
16
E
O
GLN
16
H
N
VAL
87
E
N
VAL
87
H
O
LYS
84
E
O
LYS
84
H
N
SER
100
E
N
SER
100
H
O
ILE
99
E
O
ILE
99
D
N
GLU
29
A
N
GLU
29
D
O
SER
26
A
O
SER
26
D
N
THR
41
A
N
THR
41
D
O
VAL
38
A
O
VAL
38
D
N
VAL
50
A
N
VAL
50
E
O
GLN
16
B
O
GLN
16
E
N
VAL
87
B
N
VAL
87
E
O
LYS
84
B
O
LYS
84
E
N
SER
100
B
N
SER
100
E
O
ILE
99
B
O
ILE
99
F
N
GLU
29
C
N
GLU
29
F
O
SER
26
C
O
SER
26
F
N
THR
41
C
N
THR
41
F
O
VAL
38
C
O
VAL
38
F
N
VAL
50
C
N
VAL
50
F
O
GLN
16
C
O
GLN
16
F
N
VAL
87
C
N
VAL
87
F
O
LYS
84
C
O
LYS
84
F
N
SER
100
C
N
SER
100
F
O
ILE
99
C
O
ILE
99
G
N
GLU
29
D
N
GLU
29
G
O
SER
26
D
O
SER
26
G
N
THR
41
D
N
THR
41
G
O
VAL
38
D
O
VAL
38
G
N
VAL
50
D
N
VAL
50
G
O
GLN
16
D
O
GLN
16
G
N
VAL
87
D
N
VAL
87
G
O
LYS
84
D
O
LYS
84
G
N
SER
100
D
N
SER
100
G
O
ILE
99
D
O
ILE
99
H
N
GLU
29
E
N
GLU
29
H
O
SER
26
E
O
SER
26
H
N
THR
41
E
N
THR
41
H
O
VAL
38
E
O
VAL
38
H
N
VAL
50
E
N
VAL
50
A
O
LEU
5
F
O
LEU
5
A
N
ILE
88
F
N
ILE
88
A
O
TYR
83
F
O
TYR
83
A
N
VAL
130
F
N
VAL
130
A
O
ARG
129
F
O
ARG
129
A
N
ASP
136
F
N
ASP
136
A
O
VAL
60
F
O
VAL
60
A
N
ALA
115
F
N
ALA
115
A
O
SER
114
F
O
SER
114
A
N
PHE
95
F
N
PHE
95
1
A
ASN
1
F
ASN
1
1
Y
1
A
GLY
2
F
GLY
2
1
Y
1
A
ASP
3
F
ASP
3
1
Y
1
A
ASN
189
F
ASN
189
1
Y
1
A
SER
190
F
SER
190
1
Y
1
A
SER
191
F
SER
191
1
Y
1
A
ARG
192
F
ARG
192
1
Y
1
A
THR
193
F
THR
193
1
Y
1
A
ILE
194
F
ILE
194
1
Y
1
A
THR
195
F
THR
195
1
Y
1
A
ARG
237
F
ARG
237
1
Y
1
A
ASP
238
F
ASP
238
1
Y
1
A
GLU
239
F
GLU
239
1
Y
1
A
LEU
240
F
LEU
240
1
Y
1
-17.34
2.70
111.00
93.66
E
E
E
N
CA
C
VAL
VAL
VAL
50
50
50
N
1
-18.57
2.70
111.00
92.43
F
F
F
N
CA
C
VAL
VAL
VAL
50
50
50
N
1
-17.31
2.70
111.00
93.69
G
G
G
N
CA
C
VAL
VAL
VAL
50
50
50
N
1
F
ASP
83
-80.09
-70.71
1
H
ASN
14
74.90
36.36
1
H
ILE
20
-98.12
-60.56
1
H
LYS
34
76.67
-4.41
1
A
ARG
54
-25.12
115.78
1
A
TYR
55
-153.08
22.06
1
A
ASP
57
72.00
45.22
1
A
LEU
77
-99.36
30.07
1
A
PRO
92
-54.18
-7.02
1
A
PRO
108
-48.50
-83.81
1
A
TYR
109
-31.50
-36.89
1
A
GLN
111
65.47
66.50
1
A
GLU
137
-52.55
4.04
1
A
ARG
175
-98.91
30.83
1
A
GLN
185
-59.76
108.22
PARAHCSDX.PRO
TOPHCSDX.PRO
PARAM19.SOL
25.9
RESIDUES 1 - 3, 189 - 195 AND 237 - 240 OF THE A SUBUNIT ARE OMITTED FROM THE
STRUCTURE BECAUSE OF POOR ELECTRON DENSITY
GLY A 188 IS THE LAST RESIDUE BEFORE GAP (RESIDUES A 189 -
A 195 ARE DISORDERED). LEU A 240 IS THE LAST RESIDUE BUT
RESIDUES A 237 - A 240 ARE DISORDERED.
0.261
0.188
0.188
2.0
10.0
2424
48350
4.5
90.6
RANDOM
1
THROUGHOUT
2.0
ISOMORPHOUS MOLECULAR REPLACEMENT
PDB ENTRY 1LTT
2.0
10.0
0
6093
115
0
5978
0.011
1.9
23.1
1.5
0.271
0.256
2.07
183
3584
10
3.5
75.5
2.0
100.0
1LT3
48385
1.
0.053
1
17.
2.9
90.5
2.0
2.07
4.5
0.175
72.
data reduction
DENZO
data scaling
SCALEPACK
model building
X-PLOR
refinement
X-PLOR
phasing
X-PLOR
HEAT-LABILE ENTEROTOXIN DOUBLE MUTANT N40C/G166C
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
ASYMMETRIC UNIT CONTAINS ONE AB5 TOXIN HEXAMER. THE A
SUBUNIT CONTAINS TWO FRAGMENTS LINKED BY A DISORDERED
LOOP. THESE 2 FRAGMENTS ARE CONVENTIONALLY REFERRED TO AS
A1 AND A2. FRAGMENTS A1 AND A2 ARE COVALENTLY LINKED IN
THE LATENT TOXIN AND ARE PROTEOLYTICALLY CLEAVED UPON
ACTIVATION.
D
ILE
5
A
ILE
5
HELX_P
D
GLU
11
A
GLU
11
1
1
7
D
ASP
59
A
ASP
59
HELX_P
D
THR
78
A
THR
78
1
2
20
E
ILE
5
B
ILE
5
HELX_P
E
GLU
11
B
GLU
11
1
3
7
E
ASP
59
B
ASP
59
HELX_P
E
THR
78
B
THR
78
1
4
20
F
ILE
5
C
ILE
5
HELX_P
F
GLU
11
C
GLU
11
1
5
7
F
ASP
59
C
ASP
59
HELX_P
F
THR
78
C
THR
78
5
6
20
G
ILE
5
D
ILE
5
HELX_P
G
GLU
11
D
GLU
11
1
7
7
G
ASP
59
D
ASP
59
HELX_P
G
LEU
77
D
LEU
77
1
8
19
H
ILE
5
E
ILE
5
HELX_P
H
GLU
11
E
GLU
11
1
9
7
H
ASP
59
E
ASP
59
HELX_P
H
THR
78
E
THR
78
1
10
20
A
PRO
13
F
PRO
13
HELX_P
A
SER
19
F
SER
19
1
11
7
A
LEU
41
F
LEU
41
HELX_P
A
ARG
46
F
ARG
46
1
12
6
A
LEU
66
F
LEU
66
HELX_P
A
ILE
76
F
ILE
76
1
13
11
A
VAL
97
F
VAL
97
HELX_P
A
TYR
104
F
TYR
104
1
14
8
A
TYR
121
F
TYR
121
HELX_P
A
GLN
123
F
GLN
123
5
15
3
A
ASP
147
F
ASP
147
HELX_P
A
TYR
150
F
TYR
150
1
16
4
A
ALA
158
F
ALA
158
HELX_P
A
ASP
160
F
ASP
160
5
17
3
A
TYR
162
F
TYR
162
HELX_P
A
LEU
164
F
LEU
164
5
18
3
A
GLN
172
F
GLN
172
HELX_P
A
ARG
175
F
ARG
175
5
19
4
A
TRP
179
F
TRP
179
HELX_P
A
HIS
182
F
HIS
182
5
20
4
A
ASP
197
F
ASP
197
HELX_P
A
TYR
226
F
TYR
226
1
21
30
disulf
2.028
D
CYS
9
A
SG
CYS
9
1_555
D
CYS
86
A
SG
CYS
86
1_555
disulf
2.040
E
CYS
9
B
SG
CYS
9
1_555
E
CYS
86
B
SG
CYS
86
1_555
disulf
2.028
F
CYS
9
C
SG
CYS
9
1_555
F
CYS
86
C
SG
CYS
86
1_555
disulf
2.034
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
disulf
2.019
A
CYS
40
F
SG
CYS
40
1_555
A
CYS
166
F
SG
CYS
166
1_555
disulf
2.025
A
CYS
187
F
SG
CYS
187
1_555
A
CYS
199
F
SG
CYS
199
1_555
covale
1.415
both
B
BGC
1
G
O4
BGC
1_555
B
GAL
2
G
C1
GAL
1_555
covale
1.397
both
C
BGC
1
H
O4
BGC
1_555
C
GAL
2
H
C1
GAL
1_555
covale
1.433
both
I
BGC
1
I
O4
BGC
1_555
I
GAL
2
I
C1
GAL
1_555
covale
1.422
both
J
BGC
1
J
O4
BGC
1_555
J
GAL
2
J
C1
GAL
1_555
covale
1.475
both
K
BGC
1
K
O4
BGC
1_555
K
GAL
2
K
C1
GAL
1_555
ENTEROTOXIN
ENTEROTOXIN
D
THR
92
A
THR
92
1
D
PRO
93
A
PRO
93
-0.23
E
THR
92
B
THR
92
1
E
PRO
93
B
PRO
93
-0.13
F
THR
92
C
THR
92
1
F
PRO
93
C
PRO
93
-0.35
G
THR
92
D
THR
92
1
G
PRO
93
D
PRO
93
0.01
H
THR
92
E
THR
92
1
H
PRO
93
E
PRO
93
-0.27
A
GLU
177
F
GLU
177
1
A
PRO
178
F
PRO
178
-0.16
ELBP_ECOLI
UNP
1
1
P32890
MNKVKCYVLFTALLSSLYAHGAPQTITELCSEYRNTQIYTINDKILSYTESMAGKREMVIITFKSGETFQVEVPGSQHID
SQKKAIERMKDTLRITYLTETKIDKLCVWNNKTPNSIAAISMKN
ELAP_ECOLI
UNP
2
1
P06717
MKNITFIFFILLASPLYANGDRLYRADSRPPDEIKRSGGLMPRGHNEYFDRGTQMNINLYDHARGTQTGFVRYDDGYVST
SLSLRSAHLAGQSILSGYSTYYIYVIATAPNMFNVNDVLGVYSPHPYEQEVSALGGIPYSQIYGWYRVNFGVIDERLHRN
REYRDRYYRNLNIAPAEDGYRLAGFPPDHQAWREEPWIHHAPQGCGNSSRTITGDTCNEETQNLSTIYLREYQSKVKRQI
FSDYQSEVDIYNRIRDEL
22
124
1LT3
1
103
P32890
D
1
1
103
22
124
1LT3
1
103
P32890
E
1
1
103
22
124
1LT3
1
103
P32890
F
1
1
103
22
124
1LT3
1
103
P32890
G
1
1
103
22
124
1LT3
1
103
P32890
H
1
1
103
19
258
1LT3
1
240
P06717
A
2
1
240
6
ASN
engineered mutation
CYS
40
1LT3
A
P06717
UNP
58
40
6
GLY
engineered mutation
CYS
166
1LT3
A
P06717
UNP
184
166
6
6
6
6
6
4
3
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
anti-parallel
anti-parallel
anti-parallel
anti-parallel
anti-parallel
D
THR
15
A
THR
15
D
THR
19
A
THR
19
D
LYS
84
A
LYS
84
D
TRP
88
A
TRP
88
D
SER
95
A
SER
95
D
LYS
102
A
LYS
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
H
THR
15
E
THR
15
H
THR
19
E
THR
19
H
LYS
84
E
LYS
84
H
TRP
88
E
TRP
88
H
SER
95
E
SER
95
H
LYS
102
E
LYS
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
E
THR
15
B
THR
15
E
THR
19
B
THR
19
E
LYS
84
B
LYS
84
E
TRP
88
B
TRP
88
E
SER
95
B
SER
95
E
LYS
102
B
LYS
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
THR
19
C
THR
19
F
LYS
84
C
LYS
84
F
TRP
88
C
TRP
88
F
SER
95
C
SER
95
F
LYS
102
C
LYS
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
THR
19
D
THR
19
G
LYS
84
D
LYS
84
G
TRP
88
D
TRP
88
G
SER
95
D
SER
95
G
LYS
102
D
LYS
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
A
LEU
5
F
LEU
5
A
ASP
9
F
ASP
9
A
THR
82
F
THR
82
A
ILE
88
F
ILE
88
A
ILE
124
F
ILE
124
A
ASN
131
F
ASN
131
A
VAL
134
F
VAL
134
A
ASP
136
F
ASP
136
A
TYR
59
F
TYR
59
A
THR
62
F
THR
62
A
VAL
113
F
VAL
113
A
LEU
116
F
LEU
116
A
MET
94
F
MET
94
A
ASN
96
F
ASN
96
19
P 21 21 21