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1t8l

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{{STRUCTURE_1t8l| PDB=1t8l | SCENE= }}
{{STRUCTURE_1t8l| PDB=1t8l | SCENE= }}
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'''CRYSTAL STRUCTURE OF THE P1 MET BPTI MUTANT- BOVINE CHYMOTRYPSIN COMPLEX'''
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===CRYSTAL STRUCTURE OF THE P1 MET BPTI MUTANT- BOVINE CHYMOTRYPSIN COMPLEX===
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==Overview==
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The bovine chymotrypsin-bovine pancreatic trypsin inhibitor (BPTI) interaction belongs to extensively studied models of protein-protein recognition. The accommodation of the inhibitor P1 residue in the S1 binding site of the enzyme forms the hot spot of this interaction. Mutations introduced at the P1 position of BPTI result in a more than five orders of magnitude difference of the association constant values with the protease. To elucidate the structural aspects of the discrimination between different P1 residues, crystal structures of five bovine chymotrypsin-P1 BPTI variant complexes have been determined at pH 7.8 to a resolution below 2 A. The set includes polar (Thr), ionizable (Glu, His), medium-sized aliphatic (Met) and large aromatic (Trp) P1 residues and complements our earlier studies of the interaction of different P1 side-chains with the S1 pocket of chymotrypsin. The structures have been compared to the complexes of proteases with similar and dissimilar P1 preferences, including Streptomyces griseus proteases B and E, human neutrophil elastase, crab collagenase, bovine trypsin and human thrombin. The S1 sites of these enzymes share a common general shape of significant rigidity. Large and branched P1 residues adapt in their complexes similar conformations regardless of the polarity and size differences between their S1 pockets. Conversely, long and flexible residues such as P1 Met are present in the disordered form and display a conformational diversity despite similar inhibitory properties with respect to most enzymes studied. Thus, the S1 specificity profiles of the serine proteases appear to result from the precise complementarity of the P1-S1 interface and minor conformational adjustments occurring upon the inhibitor binding.
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{{ABSTRACT_PUBMED_15544809}}
==About this Structure==
==About this Structure==
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[[Category: S1 pocket]]
[[Category: S1 pocket]]
[[Category: Serine proteinase]]
[[Category: Serine proteinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 01:18:02 2008''

Revision as of 22:18, 27 July 2008

Image:1t8l.png

Template:STRUCTURE 1t8l

CRYSTAL STRUCTURE OF THE P1 MET BPTI MUTANT- BOVINE CHYMOTRYPSIN COMPLEX

Template:ABSTRACT PUBMED 15544809

About this Structure

1T8L is a Protein complex structure of sequences from Bos taurus. Full crystallographic information is available from OCA.

Reference

Crystal structures of five bovine chymotrypsin complexes with P1 BPTI variants., Czapinska H, Helland R, Smalas AO, Otlewski J, J Mol Biol. 2004 Dec 3;344(4):1005-20. PMID:15544809

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