Crystal structure of human TMDP, a testis-specific dual specificity protein phosphatase: Implications for substrate specificity

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Title
Crystal structure of human TMDP, a testis-specific dual specificity protein phosphatase: Implications for substrate specificity
Author(s)
Seung Jun KimDae Gwin JeongTae-Sung Yoon; J H Son; S K Cho; Seong Eon Ryu; J H Kim
Bibliographic Citation
Proteins-Structure Function and Bioinformatics, vol. 66, no. 1, pp. 239-245
Publication Year
2007
Abstract
The testis- and skeletal-muscle-specific dual-specificity phosphatase (TMDP) is a member of the dual-specificity phosphatase (DSP) subgroup of protein tyrosine phosphatases. TMDP has similar activities toward both tyrosine and threonine phosphorylated substrates, and is supposed to be involved in spermatogenesis. Here, we report the crystal structure of human TMDP at a resolution of 2.4 ?. In spite of high sequence similarity with other DSPs, the crystal structure of TMDP shows distinct structural motifs and surface properties. In TMDP, the α1-β1 loop, a substrate recognition motif is located further away from the active site loop in comparison to prototype DSP Vaccinia H1 related phophatase (VHR), which preferentially dephosphorylates tyrosine phosphorylated substrates and down-regulates MAP kinase signaling. Residues in the active site residues of TMDP are smaller in size and more hydrophobic than those of VHR. In addition, TMDP cannot be aligned with VHR in loop β3-α4. These differences in the active site of TMDP result in a flat and wide pocket structure, allowing equal binding of phosphotyrosine and phosphothreonine substrates.
Keyword
Crystal structureDual-specificity phosphataseTMDP
ISSN
0887-3585
Publisher
Wiley
DOI
http://dx.doi.org/10.1002/prot.21197
Type
Article
Appears in Collections:
Critical Diseases Diagnostics Convergence Research Center > 1. Journal Articles
Division of Research on National Challenges > Bionanotechnology Research Center > 1. Journal Articles
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