Journal
BIOCHEMISTRY
Volume 51, Issue 41, Pages 8047-8049Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bi3012725
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Funding
- National Institutes of Health [GM084278, GM059802, CA167505, 8G12MD007603]
- American Cancer Society [RSG-08-067-01-LIB]
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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 p38 alpha. 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 p38 alpha-HePTP interactions. D-Motif-DRS interactions for the two kinases, while similar overall, do show some specific differences.
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