Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 29.19 kDa 
• Atom Count: 2081 
• Residue Count: 268 
• Unique protein chains: 1

2H9I

Mycobacterium tuberculosis InhA bound with ETH-NAD adduct

• DOI: 10.2210/pdb2H9I/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Mycobacterium tuberculosis
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2006-06-09 Released: 2007-01-30 
• Deposition Author(s): Wang, F., Sacchettini, J.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.261 
• R-Value Work: 0.233 
• R-Value Observed: 0.237 

Literature

Mechanism of thioamide drug action against tuberculosis and leprosy.

Wang, F., Langley, R., Gulten, G., Dover, L.G., Besra, G.S., Jacobs, W.R., Sacchettini, J.C.

(2007) J Exp Med 204: 73-78

• PubMed: 17227913 
• DOI: 10.1084/jem.20062100
• Primary Citation of Related Structures:  
  2NTJ, 2NTV, 2H9I


• PubMed Abstract: 
  

Thioamide drugs, ethionamide (ETH) and prothionamide (PTH), are clinically effective in the treatment of Mycobacterium tuberculosis, M. leprae, and M. avium complex infections. Although generally considered second-line drugs for tuberculosis, their use has increased considerably as the number of multidrug resistant and extensively drug resistant tuberculosis cases continues to rise. Despite the widespread use of thioamide drugs to treat tuberculosis and leprosy, their precise mechanisms of action remain unknown. Using a cell-based activation method, we now have definitive evidence that both thioamides form covalent adducts with nicotinamide adenine dinucleotide (NAD) and that these adducts are tight-binding inhibitors of M. tuberculosis and M. leprae InhA. The crystal structures of the inhibited M. leprae and M. tuberculosis InhA complexes provide the molecular details of target-drug interactions. The purified ETH-NAD and PTH-NAD adducts both showed nanomolar Kis against M. tuberculosis and M. leprae InhA. Knowledge of the precise structures and mechanisms of action of these drugs provides insights into designing new drugs that can overcome drug resistance.

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Organizational Affiliation: 

Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Enoyl-[acyl-carrier-protein] reductase [NADH]	A	268	Mycobacterium tuberculosis	Mutation(s): 1  Gene Names: inhA EC: 1.3.1.9
Find proteins for P9WGR1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WGR1  Go to UniProtKB:  P9WGR1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EAD	A	{(2R,3S,4R,5R)-5-[(4S)-3-(AMINOCARBONYL)-4-(2-ETHYLISONICOTINOYL)PYRIDIN-1(4H)-YL]-3,4-DIHYDROXYTETRAHYDROFURAN-2-YL}METHYL [(2R,3S,4R,5R)-5-(6-AMINO-9H-PURIN-9-YL)-3,4-DIHYDROXYTETRAHYDROFURAN-2-YL]METHYL DIHYDROGEN DIPHOSPHATE C29 H36 N8 O15 P2 KVEIKWLOSUPDGF-OYBINNFYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.261 
• R-Value Work: 0.233 
• R-Value Observed: 0.237 
• Space Group: P 6₂ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 97.934	α = 90
b = 97.934	β = 90
c = 140.42	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
HKL-2000	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-06-09 
• Released Date: 2007-01-30 
Deposition Author(s): Wang, F., Sacchettini, J.C.

Revision History 

• Version 1.0: 2007-01-30
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance