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1jc6

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{{STRUCTURE_1jc6| PDB=1jc6 | SCENE= }}
{{STRUCTURE_1jc6| PDB=1jc6 | SCENE= }}
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'''SOLUTION STRUCTURE OF BUNGARUS FACIATUS IX, A KUNITZ-TYPE CHYMOTRYPSIN INHIBITOR'''
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===SOLUTION STRUCTURE OF BUNGARUS FACIATUS IX, A KUNITZ-TYPE CHYMOTRYPSIN INHIBITOR===
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==Overview==
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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.
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{{ABSTRACT_PUBMED_11562364}}
==About this Structure==
==About this Structure==
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1JC6 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bungarus_fasciatus Bungarus fasciatus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JC6 OCA].
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1JC6 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bungarus_fasciatus Bungarus fasciatus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JC6 OCA].
==Reference==
==Reference==
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[[Category: Snake venom]]
[[Category: Snake venom]]
[[Category: Solution structure]]
[[Category: Solution structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 21:02:35 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:00:34 2008''

Revision as of 17:00, 1 July 2008

Image:1jc6.png

Template:STRUCTURE 1jc6

SOLUTION STRUCTURE OF BUNGARUS FACIATUS IX, A KUNITZ-TYPE CHYMOTRYPSIN INHIBITOR

Template:ABSTRACT PUBMED 11562364

About this Structure

1JC6 is a Single protein structure of sequence from Bungarus fasciatus. Full experimental 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

Page seeded by OCA on Tue Jul 1 20:00:34 2008

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