1q2q: Difference between revisions

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[[Image:1q2q.gif|left|200px]]
{{Seed}}
[[Image:1q2q.png|left|200px]]


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{{STRUCTURE_1q2q|  PDB=1q2q  |  SCENE=  }}  
{{STRUCTURE_1q2q|  PDB=1q2q  |  SCENE=  }}  


'''Enterobacter cloacae GC1 class C beta-lactamase complexed with penem WAY185229'''
===Enterobacter cloacae GC1 class C beta-lactamase complexed with penem WAY185229===




==Overview==
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The design and synthesis of a series of seven tricyclic 6-methylidene penems as novel class A and C serine beta-lactamase inhibitors is described. These compounds proved to be very potent inhibitors of the TEM-1 and AmpC beta-lactamases and less so against the class B metallo-beta-lactamase CcrA. In combination with piperacillin, their in vitro activities enhanced susceptibility of all class C resistant strains from various bacteria. Crystallographic structures of a serine-bound reaction intermediate of 17 with the class A SHV-1 and class C GC1 enzymes have been established to resolutions of 2.0 and 1.4 A, respectively, and refined to R-factors equal 0.163 and 0.145. In both beta-lactamases, a seven-membered 1,4-thiazepine ring has formed. The stereogenic C7 atom in the ring has the R configuration in the SHV-1 intermediate and has both R and S configurations in the GC1 intermediate. Hydrophobic stacking interactions between the tricyclic C7 substituent and a tyrosine side chain, rather than electrostatic or hydrogen bonding by the C3 carboxylic acid group, dominate in both complexes. The formation of the 1,4- thiazepine ring structures is proposed based on a 7-endo-trig cyclization.
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{{ABSTRACT_PUBMED_15588091}}


==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Inhibition]]
[[Category: Inhibition]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 05:47:29 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:26:13 2008''

Revision as of 04:26, 29 July 2008

File:1q2q.png

Template:STRUCTURE 1q2q

Enterobacter cloacae GC1 class C beta-lactamase complexed with penem WAY185229

Template:ABSTRACT PUBMED 15588091

About this Structure

1Q2Q is a Single protein structure of sequence from Enterobacter cloacae. Full crystallographic information is available from OCA.

Reference

Structure-activity relationship of 6-methylidene penems bearing tricyclic heterocycles as broad-spectrum beta-lactamase inhibitors: crystallographic structures show unexpected binding of 1,4-thiazepine intermediates., Venkatesan AM, Gu Y, Dos Santos O, Abe T, Agarwal A, Yang Y, Petersen PJ, Weiss WJ, Mansour TS, Nukaga M, Hujer AM, Bonomo RA, Knox JR, J Med Chem. 2004 Dec 16;47(26):6556-68. PMID:15588091

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