1.000000
0.000000
0.000000
0.000000
1.000000
0.000000
0.000000
0.000000
1.000000
0.00000
0.00000
0.00000
Guijarro, J.I.
M'Barek, S.
Olamendi-Portugal, T.
Gomez-Lagunas, F.
Garnier, D.
Rochat, H.
Possani, L.D.
Sabatier, J.M.
Delepierre, M.
http://mmcif.pdb.org/dictionaries/ascii/mmcif_pdbx.dic
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 H13 N O2
131.173
y
ISOLEUCINE
L-peptide linking
C6 H15 N2 O2 1
147.195
y
LYSINE
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
C9 H11 N O3
181.189
y
TYROSINE
L-peptide linking
US
Protein Sci.
PRCIEI
0795
0961-8368
12
1844
1854
10.1110/ps.03186703
12930984
Solution structure of Pi4, a short four-disulfide-bridged scorpion toxin specific of potassium channels.
2003
UK
Toxicon
TOXIA6
2043
0041-0101
36
759
770
10.1016/S0041-0101(97)00163-3
Two similar peptides from the venom of the scorpion Pandinus imperator, one highly effective blocker and the other inactive on K+ channels
1998
10.2210/pdb1n8m/pdb
pdb_00001n8m
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
SINGLE WAVELENGTH
M
1
1.0
4195.964
Potassium channel blocking toxin 4
1
syn
polymer
Pi4
no
no
IEAIRCGGSRDCYRPCQKRTGCPNAKCINKTCKCYGCS
IEAIRCGGSRDCYRPCQKRTGCPNAKCINKTCKCYGCS
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
database_2
pdbx_struct_assembly
pdbx_struct_oper_list
repository
Initial release
Version format compliance
Version format compliance
Database references
Derived calculations
1
0
2003-09-02
1
1
2008-04-28
1
2
2011-07-13
1
3
2022-02-23
_database_2.pdbx_DOI
_database_2.pdbx_database_accession
RCSB
Y
RCSB
2002-11-21
REL
REL
This sequence occurs naturally in the venom of Pandinus imperator scorpions, with an amidated C-terminus. It was established by NMR that the structure of the natural toxin extracted from scorpion venom is effectively identical to the structure of the synthetic toxin, which has a carboxylated C-terminus.
sample
Disulfide bridges were determined by NMR and by N-terminal sequencing of proteolysis peptides.
Distance constraints were derived from initial nOe build up rates using 2D NOESY experiments with mixing times of 70, 100, 150, 200 and 250 ms in H2O and D2O.
structures with the lowest energy
20
10
2D NOESY
P-COSY
2D NOESY
5
4.0
ambient
303
K
Structures are based on a total of 705 constraints, 679 are meaningful nOe derived constraints (642 unambiguous, 37 ambiguous), 16 are dihedral (phi) angle constraints and 10 are hydrogen bonds. The four disulfide bridges (CYS 6-27, 12-32, 16-34, 22-37) were included in the topology file used for the calculations.
torsion angle dynamics
1
lowest energy
2.5 mM Pi4, 5 mM CD3COONa, pH 4.0, 10% D2O
90% H2O/10% D2O
3.2 mM Pi4, 5 mM CD3COONa, pD 4.0, 100% D2O
100% D2O
Varian Inc.
collection
VNMR
6.1C
Johnson
data analysis
NMRView
5.03
Nilges
structure solution
ARIA
1.2
Brunger
structure solution
CNS
1.1
Brunger
refinement
CNS
1.1
500
Varian
INOVA
ILE
1
n
1
ILE
1
A
GLU
2
n
2
GLU
2
A
ALA
3
n
3
ALA
3
A
ILE
4
n
4
ILE
4
A
ARG
5
n
5
ARG
5
A
CYS
6
n
6
CYS
6
A
GLY
7
n
7
GLY
7
A
GLY
8
n
8
GLY
8
A
SER
9
n
9
SER
9
A
ARG
10
n
10
ARG
10
A
ASP
11
n
11
ASP
11
A
CYS
12
n
12
CYS
12
A
TYR
13
n
13
TYR
13
A
ARG
14
n
14
ARG
14
A
PRO
15
n
15
PRO
15
A
CYS
16
n
16
CYS
16
A
GLN
17
n
17
GLN
17
A
LYS
18
n
18
LYS
18
A
ARG
19
n
19
ARG
19
A
THR
20
n
20
THR
20
A
GLY
21
n
21
GLY
21
A
CYS
22
n
22
CYS
22
A
PRO
23
n
23
PRO
23
A
ASN
24
n
24
ASN
24
A
ALA
25
n
25
ALA
25
A
LYS
26
n
26
LYS
26
A
CYS
27
n
27
CYS
27
A
ILE
28
n
28
ILE
28
A
ASN
29
n
29
ASN
29
A
LYS
30
n
30
LYS
30
A
THR
31
n
31
THR
31
A
CYS
32
n
32
CYS
32
A
LYS
33
n
33
LYS
33
A
CYS
34
n
34
CYS
34
A
TYR
35
n
35
TYR
35
A
GLY
36
n
36
GLY
36
A
CYS
37
n
37
CYS
37
A
SER
38
n
38
SER
38
A
author_defined_assembly
1
monomeric
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
LYS
26
A
N
LYS
26
A
O
LYS
33
A
O
LYS
33
1
A
ASN
24
-54.74
104.58
1
A
CYS
37
-117.69
69.02
2
A
ALA
3
51.45
77.64
2
A
CYS
34
-69.00
98.19
2
A
CYS
37
-93.45
54.30
3
A
GLU
2
-108.47
48.00
3
A
ALA
3
56.21
76.36
3
A
ASN
24
-66.28
96.25
4
A
ASN
24
-61.66
98.75
5
A
ASN
24
-58.01
100.84
6
A
ASN
24
-62.05
99.37
8
A
ALA
3
52.43
76.18
10
A
ASN
24
-63.63
98.46
Solution structure of Pi4, a four disulfide bridged scorpion toxin active on potassium channels
1
N
N
A
SER
9
A
SER
9
HELX_P
A
GLY
21
A
GLY
21
1
1
13
disulf
2.030
A
CYS
6
A
SG
CYS
6
1_555
A
CYS
27
A
SG
CYS
27
1_555
disulf
2.028
A
CYS
12
A
SG
CYS
12
1_555
A
CYS
32
A
SG
CYS
32
1_555
disulf
2.023
A
CYS
16
A
SG
CYS
16
1_555
A
CYS
34
A
SG
CYS
34
1_555
disulf
2.029
A
CYS
22
A
SG
CYS
22
1_555
A
CYS
37
A
SG
CYS
37
1_555
TOXIN
potassium channel blocker, disulfide bridge stabilized alpha beta motif, TOXIN
SCK4_PANIM
UNP
1
1
P58498
IEAIRCGGSRDCYRPCQKRTGCPNAKCINKTCKCYGCS
1
38
1N8M
1
38
P58498
A
1
1
38
2
anti-parallel
A
ALA
25
A
ALA
25
A
ILE
28
A
ILE
28
A
THR
31
A
THR
31
A
CYS
34
A
CYS
34