Large-scale structural analysis of the classical human protein tyrosine phosphatome

Barr, A.J., Ugochukwu, E., Lee, W.H., King, O.N.F., Filippakopoulos, P., Alfano, I., Savitsky, P., Burgess-Brown, N.A., Muller, S. and Knapp, S. 2009. Large-scale structural analysis of the classical human protein tyrosine phosphatome. Cell. 136 (2), pp. 352-363.

TitleLarge-scale structural analysis of the classical human protein tyrosine phosphatome
AuthorsBarr, A.J., Ugochukwu, E., Lee, W.H., King, O.N.F., Filippakopoulos, P., Alfano, I., Savitsky, P., Burgess-Brown, N.A., Muller, S. and Knapp, S.
Abstract

Protein tyrosine phosphatases (PTPs) play a critical role in regulating cellular functions by selectively dephosphorylating their substrates. Here we present 22 human PTP crystal structures that, together with prior structural knowledge, enable a comprehensive analysis of the classical PTP family. Despite their largely conserved fold, surface properties of PTPs are strikingly diverse. A potential secondary substrate-binding pocket is frequently found in phosphatases, and this has implications for both substrate recognition and development of selective inhibitors. Structural comparison identified four diverse catalytic loop (WPD) conformations and suggested a mechanism for loop closure. Enzymatic assays revealed vast differences in PTP catalytic activity and identified PTPD1, PTPD2, and HDPTP as catalytically inert protein phosphatases. We propose a “head-to-toe” dimerization model for RPTPγ/ζ that is distinct from the “inhibitory wedge” model and that provides a molecular basis for inhibitory regulation. This phosphatome resource gives an expanded insight into intrafamily PTP diversity, catalytic activity, substrate recognition, and autoregulatory self-association.

JournalCell
Journal citation136 (2), pp. 352-363
ISSN0092-8674
Year23 Jan 2009
PublisherCell Press
Digital Object Identifier (DOI)doi:10.1016/j.cell.2008.11.038
Publication dates
Published23 Jan 2009

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