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Molecular Architecture of the Inositol Phosphatase Siw14

机译:肌醇磷酸酶SIW14的分子结构

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摘要

Siw14 is a recently discovered inositol phosphatase implicated in suppressing prion propagation in Saccharomyces cerevisiae. In this paper, we used hybrid structural methods to decipher Siw14 molecular architecture. We found the protein exists in solution as an elongated monomer that is similar to 140 angstrom in length, containing an acidic N-terminal domain and a basic C-terminal dual-specificity phosphatase (DSP) domain, structurally similar to the glycogen phosphatase laforin. The two domains are connected by a protease susceptible linker and do not interact in vitro. The crystal structure of Siw14-DSP reveals a highly basic phosphate-binding loop and an similar to 10 angstrom deep substrate-binding crevice that evolved to dephosphorylate pyro-phosphate moieties. A pseudoatomic model of the full-length phosphatase generated from solution, crystallographic, biochemical, and modeling data sheds light on the interesting zwitterionic nature of Siw14, which we hypothesized may play a role in discriminating negatively charged inositol phosphates.
机译:SiW14是最近发现的肌醇磷酸酶,其涉及抑制酿酒酵母中的朊病毒繁殖。在本文中,我们使用了混合结构方法来破译SIW14分子结构。我们发现蛋白质存在于溶液中,作为细长的单体,其长度与140埃,含有酸性N-末端结构域和碱性C末端双特异性磷酸酶(DSP)结构域,其在结构上类似于糖原磷酸酶Laforin。两个结构域通过蛋白酶敏感的接头连接,并且不会在体外相互作用。 SiW14-DSP的晶体结构揭示了高基本的磷酸盐结合环,以及类似于10埃深的深层基板结合缝隙,其演变为可去磷酸化磷酸酯的磷酸盐部分。从溶液,晶体,生物化学和建模数据产生的全长磷酸酶的伪型模型,SIW14的有趣两性离子性质的阐明,我们假设可以在鉴别带负电荷的肌醇磷酸盐中起作用。

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  • 来源
    《Biochemistry》 |2019年第6期|共12页
  • 作者单位

    Thomas Jefferson Univ Dept Biochem &

    Mol Biol 233 South 10th St Philadelphia PA 19107 USA;

    Thomas Jefferson Univ Dept Biochem &

    Mol Biol 233 South 10th St Philadelphia PA 19107 USA;

    Cornell Univ Cornell High Energy Synchrotron Source MacCHESS Macromol Diffract Facil 161 Synchrotron Dr Ithaca NY 14853 USA;

    Thomas Jefferson Univ Dept Biochem &

    Mol Biol 233 South 10th St Philadelphia PA 19107 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学;
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