Structural basis of protein phosphatase 2A stable latency.

Structural basis of protein phosphatase 2A stable latency.
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DOI:
10.1038/ncomms2663
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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蛋白磷酸酶2A(PP 2Ac)的催化亚基通过α4以潜伏形式稳定,α 4是细胞存活和所有PP 2A复合物生物合成所必需的调节蛋白。在这里,我们报告的结构α4结合的N-末端片段的PP 2Ac。这种结构表明,α4与全长PP 2Ac的结合需要在活性位点附近局部解折叠,这通过变构中继干扰了相对表面的支架亚基结合位点。这些变化稳定了PP 2Ac的非活性构象,并在活性位点扰动后将寡聚PP 2A复合物转化为α4复合物。PP 2Ac-α4界面对于细胞存活是必需的,并且在空间上阻碍了PP 2A泛素化位点,这对于细胞PP 2Ac的稳定性是重要的。我们的研究结果表明,α4是一种清道夫伴侣,结合并稳定部分折叠的PP 2Ac稳定的潜伏期,并揭示了α4调节细胞存活,生物合成和监视PP 2A全酶的机制。 α4蛋白对蛋白磷酸酶2A(PP 2A)复合物的形成、稳定性和活性至关重要。在这里,作者解决了与α4结合的截短PP 2A的晶体结构,并表明α4与蛋白质的部分折叠形式结合,使酶稳定在失活状态。
The catalytic subunit of protein phosphatase 2A (PP2Ac) is stabilized in a latent form by α4, a regulatory protein essential for cell survival and biogenesis of all PP2A complexes. Here we report the structure of α4 bound to the N-terminal fragment of PP2Ac. This structure suggests that α4 binding to the full-length PP2Ac requires local unfolding near the active site, which perturbs the scaffold subunit binding site at the opposite surface via allosteric relay. These changes stabilize an inactive conformation of PP2Ac and convert oligomeric PP2A complexes to the α4 complex upon perturbation of the active site. The PP2Ac–α4 interface is essential for cell survival and sterically hinders a PP2A ubiquitination site, important for the stability of cellular PP2Ac. Our results show that α4 is a scavenger chaperone that binds to and stabilizes partially folded PP2Ac for stable latency, and reveal a mechanism by which α4 regulates cell survival, and biogenesis and surveillance of PP2A holoenzymes. The protein α4 is essential for the formation, stability and activity of protein phosphatase 2A (PP2A) complexes. Here the authors solve the crystal structure of a truncated PP2A bound to α4 and show that α4 binds to a partially folded form of the protein, stabilizing the enzyme in an inactive state.
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发表时间: 2004-12-01
影响因子: 2.2
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发表时间: 2001-12-01
期刊: ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
影响因子: --
作者:
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DOI: 10.1038/onc.2011.20
发表时间: 2011-06-01
期刊: ONCOGENE
影响因子: 8
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