PDBsum entry 1v73

Hydrolase

PDB id: 1v73

Contents

Protein chain

331 a.a. *

Ligands

ACY

Metals

_CA ×2

Waters ×447

* Residue conservation analysis

PDB id:

1v73

Name:

Hydrolase

Title:

Crystal structure of cold-active protein-tyrosine phosphatase of a psychrophile shewanella sp.

Structure:

Psychrophilic phosphatase i. Chain: a. Synonym: protein-tyrosine-phosphatase. Engineered: yes

Source:

Shewanella sp.. Organism_taxid: 50422. Expressed in: escherichia coli. Expression_system_taxid: 562.

Resolution:

1.82Å R-factor: 0.177 R-free: 0.226

Authors:

H.Tsuruta,B.Mikami,Y.Aizono

Key ref:

H.Tsuruta et al. (2005). Crystal structure of cold-active protein-tyrosine phosphatase from a psychrophile, Shewanella sp. J Biochem (tokyo), 137, 69-77. PubMed id: 15713885

Date:

09-Dec-03 Release date: 01-Mar-05

Protein chain

Q9S427  (Q9S427_9GAMM) -  Protein-tyrosine-phosphatase from Shewanella sp

Seq: 361 a.a.

Struc: 331 a.a.

Enzyme reactions

• Enzyme class: E.C.3.1.3.48 - protein-tyrosine-phosphatase.
• Reaction: O-phospho-L-tyrosyl-[protein] + H2O = L-tyrosyl-[protein] + phosphate

Molecule diagrams generated from .mol files obtained from the KEGG ftp site

Key reference

J Biochem (tokyo) 137:69-77 (2005)

PubMed id: 15713885

Crystal structure of cold-active protein-tyrosine phosphatase from a psychrophile, Shewanella sp.

H.Tsuruta, B.Mikami, Y.Aizono.

ABSTRACT

The cold-active protein-tyrosine phosphatase (CAPTPase) of a psychrophile, Shewanella sp., shows high catalytic activity below 20 degrees C. The catalytic residue of CAPTPase is histidine, as opposed to the cysteine of known protein-tyrosine phosphatases (PTPases), and the enzyme protein has three amino acid sequences, Asp-Xaa-His, Gly-Asp-Xaa-Xaa-Asp-Arg and Gly-Asn-His-Glu, that are observed in many protein-serine/threonine phosphatases (PS/TPases). We have determined the crystal structures of CAPTPase at 1.82 angstroms and the enzyme bound with a phosphate ion at 1.90 angstroms resolution using X-ray crystallography and the multiple isomorphous replacement method. The final refined models are comprised of 331 amino acid residues, two metal ions, 447 water molecules, and an acetate or phosphate ion in an asymmetric unit. The enzyme protein consists of three beta-sheets, termed Sheet I, Sheet I', and Sheet II, and 14 alpha-helices. The CAPTPase has a different overall structure from known protein-tyrosine phosphatases. The arrangement of two metal ions, a phosphate ion and the adjacent amino acid residues in the catalytic site of CAPTPase is identical to that of PS/TPases. Thus, it was confirmed that the CAPTPase was a novel PTPase with a conformation similar to the catalytic site of PS/TPase. We speculate that the hydrophobic moiety around the catalytic residue of CAPTPase might play an important role in eliciting high activity at low temperature.