Crystal structure of the tyrosine phosphatase Cps4B from Steptococcus pneumoniae TIGR4.

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.141 

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Crystal Structures of Wzb of Escherichia Coli and Cpsb of Streptococcus Pneumoniae, Representatives of Two Families of Tyrosine Phosphatases that Regulate Capsule Assembly.

Hagelueken, G.Huang, H.Mainprize, I.L.Whitfield, C.Naismith, J.H.

(2009) J Mol Biol 392: 678

  • DOI: https://doi.org/10.1016/j.jmb.2009.07.026
  • Primary Citation of Related Structures:  
    2WJA, 2WJD, 2WJE, 2WJF

  • PubMed Abstract: 

    Many Gram-positive and Gram-negative bacteria utilize polysaccharide surface layers called capsules to evade the immune system; consequently, the synthesis and export of the capsule are a potential therapeutic target. In Escherichia coli K-30, the integral membrane tyrosine autokinase Wzc and the cognate phosphatase Wzb have been shown to be key for both synthesis and assembly of capsular polysaccharides. In the Gram-positive bacterium Streptococcus pneumoniae, the CpsCD complex is analogous to Wzc and the phosphatase CpsB is the corresponding cognate phosphatase. The phosphatases are known to dephosphorylate their corresponding autokinases, yet despite their functional equivalence, they share no sequence homology. We present the structure of Wzb in complex with phosphate and high-resolution structures of apo-CpsB and a phosphate-complexed CpsB. We show that both proteins are active toward Wzc and thereby demonstrate that CpsB is not specific for CpsCD. CpsB is a novel enzyme and represents the first solved structure of a tyrosine phosphatase from a Gram-positive bacterium. Wzb and CpsB have completely different structures, suggesting that they must operate by very different mechanisms. Although the mechanism of Wzb can be inferred from previous studies, CpsB appears to have a tyrosine phosphatase mechanism not observed before. We propose a chemical mechanism for CpsB based on site-directed mutagenesis and structural data.

  • Organizational Affiliation

    Centre for Biomolecular Sciences, The University of St. Andrews, Fife, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TYROSINE-PROTEIN PHOSPHATASE CPSB247Streptococcus pneumoniaeMutation(s): 0 
Find proteins for Q9AHD4 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore Q9AHD4 
Go to UniProtKB:  Q9AHD4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9AHD4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.141 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.98α = 90
b = 58.54β = 90
c = 114.84γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-07-14
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description