Download MendeleyStructural basis for the catalytic activity of human serine/threonine protein phosphatase-5.
Swingle, M.R., Honkanen, R.E., Ciszak, E.M.(2004) J Biol Chem 279: 33992-33999
- PubMed: 15155720
- DOI: https://doi.org/10.1074/jbc.M402855200
- Primary Citation of Related Structures:
1S95 - PubMed Abstract:
Serine/threonine protein phosphatase-5 (PP5) affects many signaling networks that regulate cell growth and cellular responses to stress. Here we report the crystal structure of the PP5 catalytic domain (PP5c) at a resolution of 1.6 A. From this structure we propose a mechanism for PP5-mediated hydrolysis of phosphoprotein substrates, which requires the precise positioning of two metal ions within a conserved Asp271-M1:M2-W1-His427-His304-Asp274 catalytic motif (where M1 and M2 are metals and W1 is a water molecule). The structure of PP5c provides a structural basis for explaining the exceptional catalytic proficiency of protein phosphatases, which are among the most powerful known catalysts. Resolution of the entire C terminus revealed a novel subdomain, and the structure of the PP5c should also aid development of type-specific inhibitors.
Organizational Affiliation:
Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama, Mobile, Alabama 36688, USA.
