Authors: Holaday SK, Martin BM, Fletcher PL, Krishna NR
The NMR structure of a new toxin, butantoxin (BuTX), which is present in the venoms of the three Brazilian scorpions Tityus serrulatus, Tityus bahiensis, and Tityus stigmurus, has been investigated. This toxin was shown to reversibly block the Shaker B potassium channels (K(d) approximately 660 nM) and inhibit the proliferation of T-cells and the interleukin-2 production of antigen-stimulated T-helper cells. BuTX is a 40 amino acid basic protein stabilized by the four disulfide bridges: Cys2-Cys5, Cys10-Cys31, Cys16-Cys36, and Cys20-Cys38. The latter three are conserved among all members of the short-chain scorpion toxin family, while the first is unique to BuTX. The three-dimensional structure of BuTX was determined using (1)H-NMR spectroscopy. NOESY, phase sensitive COSY (PH-COSY), and amide hydrogen exchange data were used to generate constraints for molecular modeling calculations. Distance geometry and simulated annealing calculations were performed to generate a family of 49 structures free of constraint violations. The secondary structure of BuTX consists of a short 2(1/2) turn alpha-helix (Glu15-Phe23) and a beta-sheet. The beta-sheet is composed of two well-defined antiparallel strands (Gly29-Met32 and Lys35-Cys38) connected by a type-I' beta-turn (Asn33-Asn34). Residues Cys5-Ala9 form a quasi-third strand of the beta-sheet. The N-terminal C2-C5 disulfide bridge unique to this toxin does not appear to confer stability to the protein.
Solution NMR structure of Dsy0195 homodimer from Desulfitobacterium hafniense: first structure representative of the YabP domain family of proteins involved in spore coat assembly.
Solution NMR structure of Dsy0195 homodimer from Desulfitobacterium hafniense: first structure representative of the YabP domain family of proteins involved in spore coat assembly.
Solution NMR structure of Dsy0195 homodimer from Desulfitobacterium hafniense: first structure representative of the YabP domain family of proteins involved in spore coat assembly.
J Struct Funct Genomics. 2011 Sep 9;
Authors: Yang Y, Ramelot TA, Cort JR, Wang H, Ciccosanti C, Jiang M, Janjua H, Acton TB, Xiao R, Everett JK, Montelione GT, Kennedy MA
Abstract
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Authors: Gao G, Dai J, Ding M, Hellekant G, Wang J, Wang D
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Authors: Chen J, Li Q, Liu CC, Zhou B, Bu G, Wang J
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Biochemistry. 1995 Apr 11;34(14):4546-61
Authors: Aumelas A, Chiche L, Kubo S, Chino N, Tamaoki H, Kobayashi Y
Addition of the Lys(-2)-Arg(-1) dipeptide, present in...
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NMR structure note: solution structure of the core domain of MESD that is essential f
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Content Type Journal Article
DOI 10.1007/s10858-010-9426-8
Authors
Jianglei Chen, Wayne State University Department of Biochemistry and Molecular Biology, School of Medicine Detroit MI 48201 USA
Qianqian Li, Wayne State University Department of Biochemistry and Molecular Biology, School of Medicine Detroit MI 48201 USA
Chia-Chen Liu, Washington University Departments of Pediatrics, and Cell Biology and Physiology, School of Medicine St. Louis MO 63110 USA
NMR solution structure of butantoxin.
Linear Mode
