2gyo

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[[Image:2gyo.jpg|left|200px]]
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{{STRUCTURE_2gyo| PDB=2gyo | SCENE= }}
{{STRUCTURE_2gyo| PDB=2gyo | SCENE= }}
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'''Methanethiol-Cys 112 Inhibition Complex of E. Coli Ketoacyl Synthase III (FabH) and Coenzyme A'''
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===Methanethiol-Cys 112 Inhibition Complex of E. Coli Ketoacyl Synthase III (FabH) and Coenzyme A===
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==Overview==
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The first step of the reaction catalyzed by the homodimeric FabH from a dissociated fatty acid synthase is acyl transfer from acyl-CoA to an active site cysteine. We report that C1 to C10 alkyl-CoA disulfides irreversibly inhibit Escherichia coli FabH (ecFabH) and Mycobacterium tuberculosis FabH with relative efficiencies that reflect these enzymes' differential acyl-group specificity. Crystallographic and kinetic studies with MeSSCoA show rapid inhibition of one monomer of ecFabH through formation of a methyl disulfide conjugate with this cysteine. Reaction of the second subunit with either MeSSCoA or acetyl-CoA is much slower. In the presence of malonyl-ACP, the acylation rate of the second subunit is restored to that of the native ecFabH. These observations suggest a catalytic model in which a structurally disordered apo-ecFabH dimer orders on binding either the first substrate, acetyl-CoA, or the inhibitor MeSSCoA, and is restored to a disordered state on binding of malonyl-ACP.
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The line below this paragraph, {{ABSTRACT_PUBMED_17524982}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 17524982 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17524982}}
==About this Structure==
==About this Structure==
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[[Category: Mechanism-based inhibitor]]
[[Category: Mechanism-based inhibitor]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Mycobacterium tuberculosis]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:39:36 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 23:52:20 2008''

Revision as of 20:52, 28 July 2008

Image:2gyo.png

Template:STRUCTURE 2gyo

Methanethiol-Cys 112 Inhibition Complex of E. Coli Ketoacyl Synthase III (FabH) and Coenzyme A

Template:ABSTRACT PUBMED 17524982

About this Structure

2GYO is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Alkyl-CoA disulfides as inhibitors and mechanistic probes for FabH enzymes., Alhamadsheh MM, Musayev F, Komissarov AA, Sachdeva S, Wright HT, Scarsdale N, Florova G, Reynolds KA, Chem Biol. 2007 May;14(5):513-24. PMID:17524982

Page seeded by OCA on Mon Jul 28 23:52:20 2008

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