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Old 11-24-2010, 09:01 PM
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Default NMR investigation of the catalytic mechanism of arylamine N-acetyltransferase from Sa

NMR investigation of the catalytic mechanism of arylamine N-acetyltransferase from Salmonella typhimurium.

Related Articles NMR investigation of the catalytic mechanism of arylamine N-acetyltransferase from Salmonella typhimurium.

Biochim Biophys Acta. 2003 Mar 17;1620(1-3):8-14

Authors: Delgoda R, Lian LY, Sandy J, Sim E

Arylamine N-acetyltransferases (NAT) are a family of enzymes found in both eucaryotes and procaryotes, which catalyse the N-acetylation of a range of arylamine and hydrazine drugs and carcinogenic arylamines, using acetyl Coenzyme A as a cofactor. Here we describe a nuclear magnetic resonance (NMR) investigation of the interaction of substrates with Salmonella typhimurium NAT. For solution NMR investigations, pure recombinant NAT from S. typhimurium was used at up to 0.1 mM. We demonstrate that a hydrazine substrate, isoniazid (INH), binds to the protein in the absence of the cofactor, acetyl CoA, and thereby suggest that even though the catalysis may follow a ping-pong pathway, ligand-enzyme interactions can occur in the absence of acetyl CoA.

PMID: 12595067 [PubMed - indexed for MEDLINE]



Source: PubMed
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