Crystal structure of the Mycobacterium tuberculosis enoyl-ACP reductase, InhA, in complex with NAD+ and a C16 fatty acyl substrate

Denise A. Rozwarski, Catherine Vilchèze, Michele Sugantino, Robert Bittman, James C. Sacchettini

Research output: Contribution to journalArticle

208 Citations (Scopus)

Abstract

Enoyl-ACP reductases participate in fatty acid biosynthesis by utilizing NADH to reduce the trans double bond between positions C2 and C3 of a fatty acyl chain linked to the acyl carrier protein. The enoyl-ACP reductase from Mycobacterium tuberculosis, known as InhA, is a member of an unusual FAS-II system that prefers longer chain fatty acyl substrates for the purpose of synthesizing mycolic acids, a major component of mycobacterial cell walls. The crystal structure of InhA in complex with NAD+ and a C16 fatty acyl substrate, trans-2-hexadecenoyl-(N-acetylcysteamine)-thioester, reveals that the substrate binds in a general 'U-shaped' conformation, with the trans double bond positioned directly adjacent to the nicotinamide ring of NAD+. The side chain of Tyr158 directly interacts with the thioester carbonyl oxygen of the C16 fatty acyl substrate and therefore could help stabilize the enolate intermediate, proposed to form during substrate catalysis. Hydrophobic residues, primarily from the substrate binding loop (residues 196219), engulf the fatty acyl chain portion of the substrate. The substrate binding loop of InhA is longer than that of other enoyl-ACP reductases and creates a deeper substrate binding crevice, consistent with the ability of InhA to recognize longer chain fatty acyl substrates.

Original languageEnglish (US)
Pages (from-to)15582-15589
Number of pages8
JournalJournal of Biological Chemistry
Volume274
Issue number22
DOIs
StatePublished - May 28 1999
Externally publishedYes

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Mycobacterium tuberculosis
NAD
Oxidoreductases
Crystal structure
Substrates
Mycolic Acids
Acyl Carrier Protein
Niacinamide
Catalysis
Cell Wall
Fatty Acids
Oxygen
Biosynthesis
Conformations
Cells

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Crystal structure of the Mycobacterium tuberculosis enoyl-ACP reductase, InhA, in complex with NAD+ and a C16 fatty acyl substrate. / Rozwarski, Denise A.; Vilchèze, Catherine; Sugantino, Michele; Bittman, Robert; Sacchettini, James C.

In: Journal of Biological Chemistry, Vol. 274, No. 22, 28.05.1999, p. 15582-15589.

Research output: Contribution to journalArticle

Rozwarski, Denise A. ; Vilchèze, Catherine ; Sugantino, Michele ; Bittman, Robert ; Sacchettini, James C. / Crystal structure of the Mycobacterium tuberculosis enoyl-ACP reductase, InhA, in complex with NAD+ and a C16 fatty acyl substrate. In: Journal of Biological Chemistry. 1999 ; Vol. 274, No. 22. pp. 15582-15589.
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