Crystal structure of the Mycobacterium tuberculosis serine/threonine phosphatase PstP/Ppp at 1.95 A.

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

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An Alternate Conformation and a Third Metal in PstP/Ppp, the M. tuberculosis PP2C-Family Ser/Thr Protein Phosphatase.

Pullen, K.E.Ng, H.L.Sung, P.Y.Good, M.C.Smith, S.M.Alber, T.

(2004) Structure 12: 1947-1954

  • DOI: https://doi.org/10.1016/j.str.2004.09.008
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Serine/threonine protein phosphatases are central mediators of phosphorylation-dependent signals in eukaryotes and a variety of pathogenic bacteria. Here, we report the crystal structure of the intracellular catalytic domain of Mycobacterium tuberculosis PstPpp, a membrane-anchored phosphatase in the PP2C family. Despite sharing the fold and two-metal center of human PP2Calpha, the PstPpp catalytic domain binds a third Mn(2+) in a site created by a large shift in a previously unrecognized flap subdomain adjacent to the active site. Mutations in this site selectively increased the Michaelis constant for Mn(2+) in the reaction of a noncognate, small-molecule substrate, p-nitrophenyl phosphate. The PstP/Ppp structure reveals core functional motifs that advance the framework for understanding the mechanisms of substrate recognition, catalysis, and regulation of PP2C phosphatases.

  • Organizational Affiliation

    Department of Molecular and Cell Biology, 339 Hildebrand Hall #3206, University of California, Berkeley, Berkeley, CA 94720, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative Bacterial Enzyme
A, B
237Mycobacterium tuberculosisMutation(s): 6 
Find proteins for P9WHW5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WHW5 
Go to UniProtKB:  P9WHW5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WHW5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.638α = 90
b = 58.757β = 102.15
c = 73.815γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
ELVESdata reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-23
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2014-09-10
    Changes: Database references
  • Version 1.4: 2016-09-21
    Changes: Other
  • Version 1.5: 2017-10-11
    Changes: Refinement description