title: Modification of the NADH of the isoniazid target (InhA) from Mycobacterium tuberculosis.
abstract: The preferred antitubercular drug isoniazid specifically targets a long-chain enoyl-acyl carrier protein reductase (InhA), an enzyme essential for mycolic acid biosynthesis in Mycobacterium tuberculosis. Despite the widespread use of this drug for more than 40 years, its precise mode of action has remained obscure. Data from x-ray crystallography and mass spectrometry reveal that the mechanism of isoniazid action against InhA is covalent attachment of the activated form of the drug to the nicotinamide ring of nicotinamide adenine dinucleotide bound within the active site of InhA.
authors.affiliation: Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Rozwarski
authors.forename: G A
authors.initials: GA
authors.lastname: Grant
authors.forename: D H
authors.initials: DH
authors.lastname: Barton
authors.forename: W R
authors.initials: WR
authors.lastname: Jacobs
authors.forename: J C
authors.initials: JC
authors.lastname: Sacchettini
mesh_terms: D000995:Antitubercular Agents / Q000378:metabolism / Q000494:pharmacology*; D001426:Bacterial Proteins; D001665:Binding Sites; D001711:Biotransformation; D018360:Crystallography, X-Ray; D004352:Drug Resistance, Microbial; D050753:Enoyl-(Acyl-Carrier-Protein) Reductase (NADH); D064429:Fatty Acid Synthases / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D007538:Isoniazid / Q000378:metabolism / Q000494:pharmacology*; D013058:Mass Spectrometry; D008958:Models, Molecular; D009154:Mutation; D009169:Mycobacterium tuberculosis / Q000187:drug effects* / Q000201:enzymology; D009171:Mycolic Acids / Q000378:metabolism; D009243:NAD / Q000737:chemistry / Q000378:metabolism*; D010088:Oxidoreductases / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D000995:Antitubercular Agents; D001426:Bacterial Proteins; D009171:Mycolic Acids; D009243:NAD; D010088:Oxidoreductases; D050753:Enoyl-(Acyl-Carrier-Protein) Reductase (NADH); C085257:InhA protein, Mycobacterium; D064429:Fatty Acid Synthases; D007538:Isoniazid