1qk6
From Proteopedia
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SOLUTION STRUCTURE OF HUWENTOXIN-I BY NMR
Overview
The three-dimensional structure in aqueous solution of native, huwentoxin-I, a neurotoxin from the venom of the spider Selenocosmia, huwena, has been determined from two-dimensional H NMR data recorded at, 500 and 600 MHz. Structural constraints consisting of interproton, distances inferred from NOEs and dihedral angles from spin-spin coupling, constants were used as input for distance geometry calculation with the, program XPLOR 3.1. The best 10 structures have NOE violations < 0.3 A, dihedral violations < 2 degrees, and pairwise root-mean-square differences, of 1.08 (+/- 0.20) A over backbone atoms (N, C alpha, C). The molecule, adopts a compact structure consisting of a small triple-stranded, antiparallel beta-sheet and five beta-turns. A small hydrophobic patch, consisting of Phe 6, Trp 28, and Trp 31 is located on one side of the, molecule. All six lysine residues are distributed on the molecular, surface. The three disulfide bridges are buried within the molecule. The, structure contains an "inhibitor cystine knot motif" which is adopted by, several other small proteins, such as omega-conotoxin, agatoxin IVA, and, gurmarin.
About this Structure
1QK6 is a Single protein structure of sequence from Ornithoctonus huwena. Full crystallographic information is available from OCA.
Reference
Proton nuclear magnetic resonance studies on huwentoxin-I from the venom of the spider Selenocosmia huwena: 2. Three-dimensional structure in solution., Qu Y, Liang S, Ding J, Liu X, Zhang R, Gu X, J Protein Chem. 1997 Aug;16(6):565-74. PMID:9263120
Page seeded by OCA on Wed Nov 21 00:45:56 2007
Categories: Ornithoctonus huwena | Single protein | Ding, J. | Gu, X. | Liang, S. | Liu, X. | Qu, Y. | Zhang, R. | Cystine knot | Huwentoxin-i | Spider | Toxin
