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Title 

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

Authors 

Seung Jun KimDae Gwin JeongTae-Sung YoonJ H SonS K ChoSeong Eon RyuJ H Kim

Publisher 

Wiley-Blackwell

Issue Date 

2007

Citation 

Proteines, vol. 66, no. 1, pp. 239-245

Keywords 

crystal structuredual-specificity phosphataseTMDPamino acidmitogen activated protein kinaseprotein tyrosine phosphatasetestis and skeletal muscle specific dual specificity phosphatasevaccinia h1 related phosphatasealpha helixamino acid sequence

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.

ISSN 

0887-3585

Link 

http://dx.doi.org/10.1002/prot.21197

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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