ISDA

Entry Detail

PDB ID:

1ENY

Keywords:

OXIDOREDUCTASE

Title:

CRYSTAL STRUCTURE AND FUNCTION OF THE ISONIAZID TARGET OF MYCOBACTERIUM TUBERCULOSIS

Biological Source:

Source Organism:

Mycobacterium tuberculosis

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

1995-01-27

Release Date:

1996-01-29

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.20 Å

R-Value Work:

0.19

R-Value Observed:

0.19

Space Group:

P 62 2 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:ENOYL-ACYL CARRIER PROTEIN (ACP) REDUCTASE
Chain IDs:A
Chain Length:268
Number of Molecules:1
Biological Source:Mycobacterium tuberculosis

UniProt ID:P9WGR1 Pfam ID:PF13561 EC:1.3.1.118

Ligand Molecules

NAD

Primary Citation

Crystal structure and function of the isoniazid target of Mycobacterium tuberculosis.

Dessen, A, Quemard, A, Blanchard, J.S, Jacobs Jr, W.R, Sacchettini, J.C.Show

Science 267 1638 1641 (1995)

PMID: 7886450

Abstact

Resistance to isoniazid in Mycobacterium tuberculosis can be mediated by substitution of alanine for serine 94 in the InhA protein, the drug's primary target. InhA was shown to catalyze the beta-nicotinamide adenine dinucleotide (NADH)-specific reduction of 2-trans-enoyl-acyl carrier protein, an essential step in fatty acid elongation. Kinetic analyses suggested that isoniazid resistance is due to a decreased affinity of the mutant protein for NADH. The three-dimensional structures of wild-type and mutant InhA, refined to 2.2 and 2.7 angstroms, respectively, revealed that drug resistance is directly related to a perturbation in the hydrogen-bonding network that stabilizes NADH binding.

Legend

Protein

Chemical

Disease

Primary Citation of related structures