PDBsum entry: 2wje

Hydrolase

PDB-id: 2wje

Contents

Description

Header details

Header records

References

PROCHECK

Protein chain

244 a.a. *

Metal ions

_MN ×3

Waters ×382

* Residue conservation analysis

Tools

Clefts Calculation

PDB id:

2wje

Name:

Hydrolase

Title:

Crystal structure of the tyrosine phosphatase cps4b from steptococcus pneumoniae tigr4.

Structure:

Tyrosine-protein phosphatase cpsb. Chain: a. Synonym: cps4b. Engineered: yes

Source:

Streptococcus pneumoniae. Organism_taxid: 1313. Strain: tigr 4. Expressed in: escherichia coli. Expression_system_taxid: 562.

UniProt:

Q9AHD4 (CPSB1_STRPN)

Seq:

243 a.a.

Struc:

244 a.a.

Key:

PfamA domain

Secondary structure

Enzyme class:

E.C.3.1.3.48   [IntEnz]   [ExPASy]   [KEGG]   [BRENDA]

Reaction:

Protein tyrosine phosphate + H₂O = protein tyrosine + phosphate (see diagram below)

Resolution:

1.90Å

R-factor:

0.141

R-free:

0.190

Authors:

G.Hagelueken,H.Huang,J.H.Naismith

Key ref:

G.Hagelueken et al. (2009). Crystal structures of Wzb of Escherichia coli and CpsB of Streptococcus pneumoniae, representatives of two families of tyrosine phosphatases that regulate capsule assembly.. J Mol Biol, 392, 678-688. [PubMed id: 19616007] [DOI: 10.1016/j.jmb.2009.07.026]

Date:

25-May-09

Release date:

14-Jul-09

Related entries:

2wjd crystal structure of the tyrosine phosphatase cps4b from steptococcus pneumoniae tigr4.
2wjf crystal structure of the tyrosine phosphatase cps4b from steptococcus pneumoniae tigr4 in complex with phosphate.

Quick_links

Procheck

Clefts

Surface

Key reference

DOI no: 10.1016/j.jmb.2009.07.026

J Mol Biol 392:678-688 (2009)

PubMed id: 19616007

Crystal structures of Wzb of Escherichia coli and CpsB of Streptococcus pneumoniae, representatives of two families of tyrosine phosphatases that regulate capsule assembly.

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

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.