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2z3c

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{{STRUCTURE_2z3c| PDB=2z3c | SCENE= }}
{{STRUCTURE_2z3c| PDB=2z3c | SCENE= }}
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'''A Mechanistic view of Enzyme Inhibition and Peptide Hydrolysis in the Active Site of the SARS-CoV 3C-Like peptidase'''
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===A Mechanistic view of Enzyme Inhibition and Peptide Hydrolysis in the Active Site of the SARS-CoV 3C-Like peptidase===
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==Overview==
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The 3C-like main peptidase 3CL(pro) is a viral polyprotein processing enzyme essential for the viability of the Severe Acute Respiratory Syndrome coronavirus (SARS-CoV). While it is generalized that 3CL(pro) and the structurally related 3C(pro) viral peptidases cleave their substrates via a mechanism similar to that underlying the peptide hydrolysis by chymotrypsin-like serine proteinases (CLSPs), some of the hypothesized key intermediates have not been structurally characterized. Here, we present three crystal structures of SARS 3CL(pro) in complex with each of two members of a new class of peptide-based phthalhydrazide inhibitors. Both inhibitors form an unusual thiiranium ring with the nucleophilic sulfur atom of Cys145, trapping the enzyme's catalytic residues in configurations similar to the intermediate states proposed to exist during the hydrolysis of native substrates. Most significantly, our crystallographic data are consistent with a scenario in which a water molecule, possibly via indirect coordination from the carbonyl oxygen of Thr26, has initiated nucleophilic attack on the enzyme-bound inhibitor. Our data suggest that this structure resembles that of the proposed tetrahedral intermediate during the deacylation step of normal peptidyl cleavage.
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(as it appears on PubMed at http://www.pubmed.gov), where 17599357 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17599357}}
==About this Structure==
==About this Structure==
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[[Category: Beta barrel]]
[[Category: Beta barrel]]
[[Category: Hydrolase]]
[[Category: Hydrolase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed May 7 08:55:55 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 22:51:20 2008''

Revision as of 19:51, 28 July 2008

Image:2z3c.png

Template:STRUCTURE 2z3c

A Mechanistic view of Enzyme Inhibition and Peptide Hydrolysis in the Active Site of the SARS-CoV 3C-Like peptidase

Template:ABSTRACT PUBMED 17599357

About this Structure

2Z3C is a Protein complex structure of sequences from Sars coronavirus. Full crystallographic information is available from OCA.

Reference

A mechanistic view of enzyme inhibition and peptide hydrolysis in the active site of the SARS-CoV 3C-like peptidase., Yin J, Niu C, Cherney MM, Zhang J, Huitema C, Eltis LD, Vederas JC, James MN, J Mol Biol. 2007 Aug 24;371(4):1060-74. Epub 2007 Jun 8. PMID:17599357

Page seeded by OCA on Mon Jul 28 22:51:20 2008

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