1Y6X

The 1.25 A resolution structure of phosphoribosyl-ATP pyrophosphohydrolase from Mycobacterium tuberculosis

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.183 

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This is version 1.2 of the entry. See complete history. 


Literature

The 1.25 A resolution structure of phosphoribosyl-ATP pyrophosphohydrolase from Mycobacterium tuberculosis.

Javid-Majd, F., Yang, D., Ioerger, T.R., Sacchettini, J.C.

(2008) Acta Crystallogr D Biol Crystallogr 64: 627-635

  • DOI: 10.1107/S0907444908007105
  • Primary Citation of Related Structures:  
    3C90, 1Y6X

  • PubMed Abstract: 

    • Phosphoribosyl-ATP pyrophosphohydrolase is the second enzyme in the histidine-biosynthetic pathway, irreversibly hydrolyzing phosphoribosyl-ATP to phosphoribosyl-AMP and pyrophosphate. It is encoded by the hisE gene, which is present as a separate gene in many bacteria and archaea but is fused to hisI in other bacteria, fungi and plants ...

    Phosphoribosyl-ATP pyrophosphohydrolase is the second enzyme in the histidine-biosynthetic pathway, irreversibly hydrolyzing phosphoribosyl-ATP to phosphoribosyl-AMP and pyrophosphate. It is encoded by the hisE gene, which is present as a separate gene in many bacteria and archaea but is fused to hisI in other bacteria, fungi and plants. Because of its essentiality for growth in vitro, HisE is a potential drug target for tuberculosis. The crystal structures of two native (uncomplexed) forms of HisE from Mycobacterium tuberculosis have been determined to resolutions of 1.25 and 1.79 A. The structure of the apoenzyme reveals that the protein is composed of five alpha-helices with connecting loops and is a member of the alpha-helical nucleoside-triphosphate pyrophosphatase superfamily. The biological unit of the protein is a homodimer, with an active site on each subunit composed of residues exclusively from that subunit. A comparison with the Campylobacter jejuni dUTPase active site allowed the identification of putative metal- and substrate-binding sites in HisE, including four conserved glutamate and glutamine residues in the sequence that are consistent with a motif for pyrophosphohydrolase activity. However, significant differences between family members are observed in the loop region between alpha-helices H1 and H3. The crystal structure of M. tuberculosis HisE provides insights into possible mechanisms of substrate binding and the diversity of the nucleoside-triphosphate pyrophosphatase superfamily.

    Organizational Affiliation: 

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



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphoribosyl-ATP pyrophosphataseA93Mycobacterium tuberculosisMutation(s): 1 
Gene Names: hisE
EC: 3.6.1.31
Find proteins for P9WMM9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WMM9 
Go to UniProtKB:  P9WMM9
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.183 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.925α = 90
b = 62.597β = 90
c = 67.051γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
SHELXDphasing
SHELXEmodel building

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-03-01
    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