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Biochemistry. 2012 Oct 16;51(41):8047-9. doi: 10.1021/bi3012725. Epub 2012 Oct 5.

Docking interactions of hematopoietic tyrosine phosphatase with MAP kinases ERK2 and p38α.

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1
Department of Chemistry, The City College of New York, New York, NY 10031, USA.

Abstract

Hematopoietic tyrosine phosphatase (HePTP) regulates orthogonal MAP kinase signaling cascades by dephosphorylating both extracellular signal-regulated kinase (ERK) and p38. HePTP recognizes a docking site (D-recruitment site, DRS) on its targets using a conserved N-terminal sequence motif (D-motif). Using solution nuclear magnetic resonance spectroscopy and isothermal titration calorimetry, we compare, for the first time, the docking interactions of HePTP with ERK2 and p38α. Our results demonstrate that ERK2-HePTP interactions primarily involve the D-motif, while a contiguous region called the kinase specificity motif also plays a key role in p38α-HePTP interactions. D-Motif-DRS interactions for the two kinases, while similar overall, do show some specific differences.

PMID:
23030599
PMCID:
PMC3548032
DOI:
10.1021/bi3012725
[Indexed for MEDLINE]
Free PMC Article
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