Trypsin Revisited
Trypsin Revisited
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重温胰蛋白酶
DOI:
--
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发表时间:
2003
影响因子:
4.8
通讯作者:
V. Lamzin
中科院分区:
文献类型:
--
作者:
A. Schmidt;C. Jelsch;P. Østergaard;W. Rypniewski;V. Lamzin
A series of crystal structures of trypsin, containing either an autoproteolytic cleaved peptide fragment or a covalently bound inhibitor, were determined at atomic and ultra-high resolution and subjected to ab initio quantum chemical calculations and multipole refinement. Quantum chemical calculations reproduced the observed active site crystal structure with severe deviations from standard stereochemistry and indicated the protonation state of the catalytic residues. Multipole refinement directly revealed the charge distribution in the active site and proved the validity of the ab initio calculations. The combined results confirmed the catalytic function of the active site residues and the two water molecules acting as the nucleophile and the proton donor. The crystal structures represent snapshots from the reaction pathway, close to a tetrahedral intermediate. The de-acylation of trypsin then occurs in true SN2 fashion.
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影响因子:
56.9
作者:
FREY, PA;WHITT, SA;TOBIN, JB
通讯作者:
TOBIN, JB
DOI:
10.1073/pnas.95.22.12799
发表时间:
1998-10
影响因子:
11.1
作者:
B. Schiøtt;B. Iversen;G. Madsen;F. Larsen;T. C. Bruice
通讯作者:
B. Schiøtt;B. Iversen;G. Madsen;F. Larsen;T. C. Bruice
影响因子:
2.9
作者:
Lin, J;Cassidy, CS;Frey, PA
通讯作者:
Frey, PA
影响因子:
56.9
作者:
PERONA, JJ;CRAIK, CS;FLETTERICK, RJ
通讯作者:
FLETTERICK, RJ
DOI:
10.1006/meth.1997.0484
发表时间:
1997-08-01
期刊:
METHODS-A COMPANION TO METHODS IN ENZYMOLOGY
影响因子:
--
作者:
Chow, SA
通讯作者:
Chow, SA