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Crystal Structure of the Ancient,Fe-S Scaffold IscA Reveals a Novel Protein Fold

机译:古代Fe-S脚手架ISCA的水晶结构揭示了一种新的蛋白质折叠

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摘要

IscA belongs to an ancient family of proteins responsible form iron-sulfur cluster assembly in essential metabolic pathways preserved throughout evolution.We report here the 2.3 A resolution crystal structure of Escherichia coli IscA,a novel fold in which mixed beta-sheets form a compact alpha-beta sandwich domain.In contrast to the highly mobile secondary structural elements within the bacterial Fe-S scaffold protein IscU,a protein which is thought to have a similar function,the great majority of the amino acids that are conserved in IscA homologues are located in elements that constitute a well-ordered fold.However,the 10-residue C-terminal tail segment that contains two invariant cysteines critical for the Fe-S-binding function of a cyanobacterial (Synechocystis PCC) IscA homologue is not ordered in our structure.In addition,the crystal packing reveals a helical assembly that is constructed from two possible tetrameric oligomers of IscA.
机译:ISCA属于古代蛋白质蛋白质负责,在整个进化中保存的基本代谢途径中的古代蛋白质。在此报告的是2.3大肠杆菌ISCA的分辨率晶体结构,一种新型折叠,其中混合β-片形成紧凑型α- -beta sandwich domain.in与细菌Fe-s支架蛋白ISCU中的高度移动二级结构元素相比,被认为具有类似功能的蛋白质,在ISCA同源物中保守的大多数氨基酸 在构成有序折叠的元件中。然而,在我们的结构中没有排序,含有两种含有两种不变性半胱氨酸的10-残基C末端尾段,其结构 加法,晶体包装揭示了由ISCA的两种可能的四聚体低聚物构成的螺旋组件。

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  • 来源
    《Biochemistry》 |2004年第1期|共7页
  • 作者单位

    Department of Biological Sciences Louisiana State University Baton Rouge Louisiana 70803;

    Department of Biological Sciences Louisiana State University Baton Rouge Louisiana 70803;

    Department of Biological Sciences Louisiana State University Baton Rouge Louisiana 70803;

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

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