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首页> 外文期刊>Acta crystallographica. Section F, Structural biology communications >2.4 angstrom resolution crystal structure of human TRAP1(NM), the Hsp90 paralog in the mitochondrial matrix
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2.4 angstrom resolution crystal structure of human TRAP1(NM), the Hsp90 paralog in the mitochondrial matrix

机译:2.4人类陷阱1(NM)的Angstrom分辨率晶体结构,线粒体基质中的HSP90旁系同源物

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摘要

TRAP1 is an organelle-specific Hsp90 paralog that is essential for neoplastic growth. As a member of the Hsp90 family, TRAP1 is presumed to be a general chaperone facilitating the late-stage folding of Hsp90 client proteins in the mitochondrial matrix. Interestingly, TRAP1 cannot replace cytosolic Hsp90 in protein folding, and none of the known Hsp90 co-chaperones are found in mitochondria. Thus, the three-dimensional structure of TRAP1 must feature regulatory elements that are essential to the ATPase activity and chaperone function of TRAP1. Here, the crystal structure of a human TRAP1(NM) dimer is presented, featuring an intact N-domain and M-domain structure, bound to adenosine 5'-beta,gamma-imidotriphosphate (ADPNP). The crystal structure together with epitope-mapping results shows that the TRAP1 M-domain loop 1 contacts the neighboring subunit and forms a previously unobserved third dimer interface that mediates the specific interaction with mitochondrial Hsp70.
机译:TRAP1是一种细胞器特异性的HSP90旁系同源物,对肿瘤生长至关重要。 作为HSP90家族的成员,TRAP1被认为是一般伴侣,可促进线粒体基质中HSP90客户蛋白的晚期折叠。 有趣的是,TRAP1无法替代蛋白质折叠中的胞质HSP90,并且在线粒体中未发现已知的HSP90副酮。 因此,TRAP1的三维结构必须具有对TRAP1的ATPase活性和伴侣功能至关重要的调节元件。 在这里,提出了人类TRAP1(NM)二聚体的晶体结构,具有完整的N域和M型域结构,与腺苷5'-Beta结合,γ-毫米磷酸盐(ADPNP)。 晶体结构与表位映射结果一起表明,陷阱1 M域环1接触相邻的亚基并形成先前未观察到的第三二聚体界面,从而介导了与线粒体HSP70的特定相互作用。

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