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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Priori disease susceptibility is affected by β-structure folding propensity and local side-chain interactions in PrP
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Priori disease susceptibility is affected by β-structure folding propensity and local side-chain interactions in PrP

机译:先天性疾病易感性受PrP中β结构折叠倾向和局部侧链相互作用的影响

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摘要

Priori diseases occur when the normally α-helical prion protein (PrP) converts to a pathological p-structured state with prion infectivjty (PrP~(Sc)). Exposure to PrP~(Sc) from other mammals can catalyze this conversion. Evidence from experimental and accidental transmission of prions suggests that mammals vary in their prion disease susceptibility: Hamsters and mice show relatively high susceptibility, whereas rabbits, horses, and dogs show low susceptibility. Using a novel approach to quantify conformational states of PrP by circular dichroism (CD), we find that prion susceptibility tracks with the intrinsic propensity of mammalian PrP to convert from the native, a-helical state to a cytotoxic p-structured state, which exists in a monomer-octamer equilibrium. It has been controversial whether p-structured monomers exist at acidic pH; sedimentation equilibrium and dual-wavelength CD evidence is presented for an equilibrium between a p-structured monomer and octamer in some acidic pH conditions. Our X-ray crystallographic structure of rabbit PrP has identified a key helix-capping motif implicated in the low ' prion disease susceptibility of rabbits. Removal of this capping motif increases the p-structure folding propensity of rabbit PrP to match that of PrP from mouse, a species more susceptible to prion disease.
机译:当正常的α-螺旋病毒蛋白(PrP)转变为具有病毒感染性(PrP〜(Sc))的病理性p结构状态时,就会发生先天性疾病。暴露于其他哺乳动物的PrP〜(Sc)可以催化这种转化。实验和偶然传播的transmission病毒的证据表明,哺乳动物的病毒疾病易感性各不相同:仓鼠和小鼠的易感性相对较高,而兔子,马和狗的易感性较低。使用一种新颖的方法通过圆二色性(CD)定量PrP的构象状态,我们发现病毒的敏感性以哺乳动物PrP从天然的a螺旋状态转变为细胞毒性p结构状态的固有倾向进行追踪在单体八聚物平衡中。在酸性pH条件下是否存在p-结构单体存在争议。沉降平衡和双波长CD证据表明在某些酸性pH条件下p结构单体和八聚物之间存在平衡。我们的兔PrP的X射线晶体学结构已确定了与兔的低'ion病毒病易感性有关的关键螺旋帽基序。去除该加盖基序会增加兔子PrP的p结构折叠倾向,使其与小鼠更容易感染病毒的物种的PrP相匹配。

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  • 作者单位

    Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Biochemistry, University of Toronto, Toronto Medical Discovery Tower 4-307, 101 College Street, Toronto, ON, Canada M5G 1L7;

    Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Medical Biophysics, University of Toronto, Toronto Medical Discovery Tower 4-305, 101 College Street, Toronto, ON, Canada M5G 1L7;

    Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Biochemistry, University of Toronto, Toronto Medical Discovery Tower 4-307, 101 College Street, Toronto, ON, Canada M5G 1L7;

    Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Medical Biophysics, University of Toronto, Toronto Medical Discovery Tower 4-305, 101 College Street, Toronto, ON, Canada M5G 1L7;

    Brain Research Centre, Division of Neurology, Department of Medicine, University of British Columbia and Vancouver Coastal Health, University of British Columbia Hospital, 2211 Wesbrook Mall, Vancouver, BC, Canada V6T 2B5;

    Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Biochemistry, University of Toronto, Toronto Medical Discovery Tower 4-307, 101 College Street, Toronto, ON, Canada M5G 1L7,Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Medical Biophysics, University of Toronto, Toronto Medical Discovery Tower 4-305, 101 College Street, Toronto, ON, Canada M5G 1L7,Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Molecular Genetics, University of Toronto, Toronto Medical Discovery Tower 5-358, 101 College Street, Toronto, ON, Canada M5G 1L7;

    Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Biochemistry, University of Toronto, Toronto Medical Discovery Tower 4-307, 101 College Street, Toronto, ON, Canada M5G 1L7,Campbell Family Institute for Cancer Research, Ontario Cancer Institute/University Health Network, Department of Medical Biophysics, University of Toronto, Toronto Medical Discovery Tower 4-305, 101 College Street, Toronto, ON, Canada M5G 1L7;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    protein misfolding; x-ray crystallography; creutzfeldt-jakob disease; bovine spongiform encephalopathy; folding intermediates;

    机译:蛋白质错折叠;X射线晶体学克雅氏病牛海绵状脑病;折叠中间体;

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