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首页> 外文期刊>Biochemistry >Structural Basis for the Recognition of a Bisphosphorylated MAP Kinase Peptide by Human VHR Protein Phosphatase
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Structural Basis for the Recognition of a Bisphosphorylated MAP Kinase Peptide by Human VHR Protein Phosphatase

机译:人VHR蛋白磷酸酶识别双磷酸化MAP激酶肽的结构基础

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摘要

Human VHR (vaccinia H1 related phosphatase) is a member of the dual-specificity phosphatases (DSPs) that often act on bisphosphorylated protein substrates. Unlike most DSPs, VHR displays a strong preference for dephosphorylating phosphotyrosine residues over phosphothereonine residues. Here we describe the 2.75 A crystal structur of the C124S inactive VHR mutant in complex with a bisphosphorylated peptide corresponding to the MAP kinase activation lip. This structure and subsequent biochemical studies revealed the basis for the strong preference for hydrolyzing phosphotyrosine within bisphosphorylated substrates containing -pTXpY-, In the structure, the two phospho residues are oriented into distinct pockets; the phosphotyrosine is bound in the exposed yet deep active site cleft while the phosphothreonine is loosely tethered into a nearby basic pocket containing Arg~(158). As this structure is the first substrate-enzyme complex reported for the DSP family of enzymes, these results provide the first glimpse into how DSPs bind their protein substrates.
机译:人VHR(牛痘H1相关磷酸酶)是双特​​异性磷酸酶(DSPs)的成员,该酶通常作用于双磷酸化的蛋白质底物上。与大多数DSP不同,VHR对磷酸酪氨酸残基的去磷酸化作用优于磷酸苏氨酸残基。在这里,我们描述了C124S失活VHR突变体的2.75 A晶体结构,与对应于MAP激酶激活唇的双磷酸化肽复合。这种结构和随后的生化研究揭示了在含有-pTXpY-的双磷酸化底物中强烈优先水解磷酸酪氨酸的基础。在该结构中,两个磷酸残基被定向到不同的口袋中。磷酸酪氨酸被束缚在暴露但仍较深的活性位点裂缝中,而磷酸苏氨酸则被松散地束缚在附近的一个含Arg〜(158)的基本口袋中。由于这种结构是DSP酶家族中第一个报道的底物-酶复合物,因此这些结果使我们首次了解了DSP如何结合其蛋白质底物。

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