Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Global Symmetry: Dihedral - D3  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 2 generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 33.19 kDa 
• Atom Count: 2272 
• Modelled Residue Count: 274 
• Deposited Residue Count: 304 
• Unique protein chains: 1

1NH7

ATP PHOSPHORIBOSYLTRANSFERASE (ATP-PRTASE) FROM MYCOBACTERIUM TUBERCULOSIS

• DOI: 10.2210/pdb1NH7/pdb

• Classification: TRANSFERASE
• Organism(s): Mycobacterium tuberculosis H37Rv
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2002-12-18 Released: 2003-02-11 
• Deposition Author(s): Cho, Y., Sharma, V., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.261 
• R-Value Work: 0.192 
• R-Value Observed: 0.196 

Literature

Crystal Structure of ATP Phosphoribosyltransferase from Mycobacterium Tuberculosis

Cho, Y., Sharma, V., Sacchettini, J.C.

(2003) J Biol Chem 278: 8333

• PubMed: 12511575 
• DOI: 10.1074/jbc.M212124200
• Primary Citation of Related Structures:  
  1NH8, 1NH7


• PubMed Abstract: 
  

The N-1-(5'-phosphoribosyl)-ATP transferase catalyzes the first step of the histidine biosynthetic pathway and is regulated by a feedback mechanism by the product histidine. The crystal structures of the N-1-(5'-phosphoribosyl)-ATP transferase from Mycobacterium tuberculosis in complex with inhibitor histidine and AMP has been determined to 1.8 A resolution and without ligands to 2.7 A resolution. The active enzyme exists primarily as a dimer, and the histidine-inhibited form is a hexamer. The structure represents a new fold for a phosphoribosyltransferase, consisting of three continuous domains. The inhibitor AMP binds in the active site cavity formed between the two catalytic domains. A model for the mechanism of allosteric inhibition has been derived from conformational differences between the AMP:His-bound and apo structures.

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Organizational Affiliation: 

Department of Biochemistry and Biophysics, Texas A & M University, College Station 77843-2128, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ATP Phosphoribosyltransferase	A	304	Mycobacterium tuberculosis H37Rv	Mutation(s): 0  Gene Names: hisG, Rv2121c, MTCY261.17c EC: 2.4.2.17
UniProt
Find proteins for P9WMN1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WMN1  Go to UniProtKB:  P9WMN1

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
MG	G [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.261 
• R-Value Work: 0.192 
• R-Value Observed: 0.196 
• Space Group: H 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 132.54	α = 90
b = 132.54	β = 90
c = 110.5	γ = 120

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
SHARP	phasing
REFMAC	refinement
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-12-18 
• Released Date: 2003-02-11 
Deposition Author(s): Cho, Y., Sharma, V., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

Revision History  

• Version 1.0: 2003-02-11
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance