Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Protein Workshop | Ligand Explorer

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 2 generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 29040.99 
• Atom Count: 2037 
• Residue Count: 268 
• Unique protein chains: 1

1ENZ

CRYSTAL STRUCTURE AND FUNCTION OF THE ISONIAZID TARGET OF MYCOBACTERIUM TUBERCULOSIS

• DOI: 10.2210/pdb1ENZ/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)
• Expression System: Escherichia coli


• Deposited: 1995-01-27 Released: 1996-01-29 
• Deposition Author(s): Dessen, A., Quemard, A., Blanchard, J.S., Jacobs Jr., W.R., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.7 Å
• R-Value Work: 0.193 

Literature

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.

(1995) Science 267: 1638-1641

• PubMed: 7886450 
• Primary Citation of Related Structures:  
  1ENY


• PubMed Abstract: 
  

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.

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Organizational Affiliation: 

Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ENOYL-ACYL CARRIER PROTEIN (ACP) REDUCTASE	A	268	Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)	Mutation(s): 0  Gene Names: inhA EC: 1.3.1.9
Find proteins for P9WGR1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Go to UniProtKB:  P9WGR1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NAD	A	NICOTINAMIDE-ADENINE-DINUCLEOTIDE C21 H27 N7 O14 P2 BAWFJGJZGIEFAR-NNYOXOHSSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.7 Å
• R-Value Work: 0.193 
• Space Group: P 6₂ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 100.140	α = 90.00
b = 100.140	β = 90.00
c = 139.950	γ = 120.00

Software Package:

Software Name	Purpose
TNT	refinement
X-PLOR	phasing
X-PLOR	refinement
X-PLOR	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-01-27 
• Released Date: 1996-01-29 
• Deposition Author(s): Dessen, A., Quemard, A., Blanchard, J.S., Jacobs Jr., W.R., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

Revision History 

• Version 1.0: 1996-01-29
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance
• Version 1.3: 2019-07-17
  Type: Data collection, Other, Refinement description
• Version 1.4: 2019-08-14
  Type: Data collection, Refinement description