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1vgc

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{{STRUCTURE_1vgc| PDB=1vgc | SCENE= }}
{{STRUCTURE_1vgc| PDB=1vgc | SCENE= }}
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'''GAMMA-CHYMOTRYPSIN L-PARA-CHLORO-1-ACETAMIDO BORONIC ACID INHIBITOR COMPLEX'''
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===GAMMA-CHYMOTRYPSIN L-PARA-CHLORO-1-ACETAMIDO BORONIC ACID INHIBITOR COMPLEX===
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==Overview==
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In order to probe the structural basis of stereoselectivity in the serine protease family, a series of enantiomeric boronic acids RCH2CH(NHCOCH3)B(OH)2 has been synthesized and kinetically characterized as transition-state analog inhibitors using alpha-chymotrypsin and subtilisin Carlsberg as model systems. When the R-substituent in this series was changed from a p-chlorophenyl to a 1-naphthyl group, alpha-chymotrypsin, but not subtilisin, reversed its usual preference for l-enantiomers and bound more tightly to the D-enantiomer [Martichonok, V., &amp; Jones, J. B. (1996) J. Am. Chem. Soc. 118, 950-958]. The structural factors responsible for the differences in stereoselectivity between the two enzymes have been explored by X-ray crystallographic examination of subtilisin Carlsberg and gamma-chymotrypsin complexes of the L- and D-enantiomers of p-chlorophenyl and 1-naphthyl boronic acid derivatives. In both enzymes, the L-isomers of the inhibitors, which are more closely related to the natural L-amino acid substrates, form tetrahedral adducts, covalently linking the central boron atom and Ogamma of the catalytic serine. The d-isomers, however, differ in the way they interact with subtilisin or gamma-chymotrypsin. With subtilisin, both the D-p-chlorophenyl and D-1-naphthyl inhibitor complexes form covalent Ser Ogamma-to-boron bonds, but with gamma-chymotrypsin, the same inhibitors lead to novel tetrahedral adducts covalently linking both Ser195 Ogamma and His57 Nepsilon2 covalently via the boron atom.
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{{ABSTRACT_PUBMED_9425066}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Serine protease]]
[[Category: Serine protease]]
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Revision as of 23:26, 27 July 2008

Image:1vgc.png

Template:STRUCTURE 1vgc

GAMMA-CHYMOTRYPSIN L-PARA-CHLORO-1-ACETAMIDO BORONIC ACID INHIBITOR COMPLEX

Template:ABSTRACT PUBMED 9425066

About this Structure

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

Reference

Differences in binding modes of enantiomers of 1-acetamido boronic acid based protease inhibitors: crystal structures of gamma-chymotrypsin and subtilisin Carlsberg complexes., Stoll VS, Eger BT, Hynes RC, Martichonok V, Jones JB, Pai EF, Biochemistry. 1998 Jan 13;37(2):451-62. PMID:9425066

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