1jc6
From Proteopedia
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| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1jc6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jc6 OCA], [http://www.ebi.ac.uk/pdbsum/1jc6 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1jc6 RCSB]</span> | ||
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[[Category: solution structure]] | [[Category: solution structure]] | ||
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Revision as of 18:31, 30 March 2008
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
SOLUTION STRUCTURE OF BUNGARUS FACIATUS IX, A KUNITZ-TYPE CHYMOTRYPSIN INHIBITOR
Overview
Bungarus fasciatus fraction IX (BF9), a chymotrypsin inhibitor, consists of 65 amino acid residues with three disulfide bridges. It was isolated from the snake venom of B. fasciatus by ion-exchange chromatography and belongs to the bovine pancreatic trypsin inhibitor (BPTI)-like superfamily. It showed a dissociation constant of 5.8 x 10(-8) m with alpha-chymotrypsin as measured by a BIAcore binding assay system. The isothermal titration calorimetry revealed a 1:1 binding stoichiometry between this inhibitor and chymotrypsin and apparently no binding with trypsin. We further used CD and NMR to determine the solution structure of this venom-derived chymotrypsin inhibitor. The three-dimensional NMR solution structures of BF9 were determined on the basis of 582 restraints by simulated annealing and energy minimization calculations. The final set of 10 NMR structures was well defined, with average root mean square deviations of 0.47 A for the backbone atoms in the secondary structure regions and 0.86 A for residues The side chains of Phe(23), Tyr(24), Tyr(25), Phe(35), and Phe(47) exhibited many long-range nuclear Overhauser effects and were the principal components of the hydrophobic core in BF9. To gain insight into the structure-function relationships among proteins in the BPTI-like superfamily, we compared the three-dimensional structure of BF9 with three BPTI-like proteins that possess distinct biological functions. These proteins possessed similar secondary structure elements, but the loop regions and beta-turn were different from one another. Based on residues at the functional site of each protein, we suggest that the flexibility, rigidity, and variations of the amino acid residues in both the loop and beta-turn regions are related to their biological functions.
About this Structure
1JC6 is a Single protein structure of sequence from Bungarus fasciatus. Full crystallographic information is available from OCA.
Reference
Solution structure of a Kunitz-type chymotrypsin inhibitor isolated from the elapid snake Bungarus fasciatus., Chen C, Hsu CH, Su NY, Lin YC, Chiou SH, Wu SH, J Biol Chem. 2001 Nov 30;276(48):45079-87. Epub 2001 Sep 18. PMID:11562364
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