Specificity profiling of protein phosphatases toward phosphoseryl and phosphothreonyl peptides.

Specificity profiling of protein phosphatases toward phosphoseryl and phosphothreonyl peptides.
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DOI:
10.1021/ja401692t
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发表时间:
2013-07-03
影响因子:
15
通讯作者:
Pei, Dehua
Pei, Dehua
中科院分区:
化学1区
文献类型:
--
作者:
Xiao, Qing;Luechapanichkul, Rinrada;Zhai, Yujing;Pei, Dehua

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开发了一种组合文库方法来系统地分析蛋白磷酸酶对磷酸丝氨酸 (pS) 和磷酸苏氨酰 (pT) 肽的底物特异性。应用该方法和先前报道的磷酸酪氨酰(pY)文库筛选技术对痘苗病毒的双特异性磷酸酶(DUSP)VH1进行筛选,结果表明VH1对pS/pT和pY肽均具有高度活性。 VH1 对 pS/pT 表现出与 pY 底物不同且更严格的序列特异性。与之前表征的蛋白酪氨酸磷酸酶 (PTP) 不同,VH1 的活性和特异性主要由 pS、pT 或 pY 残基 C 端的氨基酸残基决定。相比之下,哺乳动物 VH1 相关 (VHR) DUSP 对 pS 和 pT 底物本质上具有较低的催化活性,表明其主要生理功能是使底物蛋白中的 pY 残基去磷酸化。该方法适用于其他 DUSP 和蛋白丝氨酸/苏氨酸磷酸酶,底物特异性数据将有助于识别这些酶的生理底物。
A combinatorial library method was developed to systematically profile the substrate specificity of protein phosphatases toward phosphoseryl (pS) and phosphothreonyl (pT) peptides. Application of this method and a previously reported phosphotyrosyl (pY) library screening technique to dual-specificity phosphatase (DUSP) VH1 of vaccinia virus revealed that VH1 is highly active toward both pS/pT and pY peptides. VH1 exhibits different and more stringent sequence specificity toward pS/pT than pY substrates. Unlike previously characterized protein tyrosine phosphatases (PTPs), the activity and specificity of VH1 is primarily determined by the amino acid residues C-terminal to the pS, pT, or pY residue. In contrast, the mammalian VH1-related (VHR) DUSP has intrinsically low catalytic activity toward pS and pT substrates, suggesting that its primary physiological function is to dephosphorylate pY residues in substrate proteins. This method is applicable to other DUSPs and protein-serine/threonine phosphatases and the substrate specificity data will be useful for identifying the physiological substrates of these enzymes.
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