Structural analysis of the G-box domain of the microcephaly protein CPAP suggests a role in centriole architecture.

Structural analysis of the G-box domain of the microcephaly protein CPAP suggests a role in centriole architecture.
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DOI:
10.1016/j.str.2013.08.019
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发表时间:
2013-11-05
期刊:
影响因子:
5.7
通讯作者:
Vakonakis, Ioannis
Vakonakis, Ioannis
中科院分区:
生物学2区
文献类型:
--
作者:
Hatzopoulos, Georgios N.;Erat, Michele C.;Cutts, Erin;Rogala, Kacper B.;Slater, Leanne M.;Stansfeld, Philip J.;Vakonakis, Ioannis

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中心粒是进化上保守的真核细胞器,由蛋白质支架组成,周围环绕着一组具有9重径向对称的微管。CPAP是一种微管募集所必需的中心粒蛋白,具有一个结构未知的C末端结构域,即G-box。G-box中的一个错义突变降低了与中心粒穿梭蛋白STIL的亲和力,并导致了原发性小头畸形。在这里,我们表征了CPAP的分子结构,并确定了单独的G-box结构和与STIL片段形成的复合体。G-盒包括能够形成超分子组件的单个细长β片层。结构和生物物理研究强调了CPAP-STIL复合体的保守性。我们认为CPAP作为一个水平的“支柱”连接中心粒支架和微管,而G-box结构域则形成垂直连接。CpAp具有一个长的二聚体平行螺旋和一个C-末端结构域(G-box)G-box采用了一种细长的结构与单个β片状G-box结构域形成具有相当于中心粒间距的周期性的长纤维STIL具有一个保守的富含脯氨酸的基序对于CPAP与Hatzopoulos等人的结合是重要的。描述必需中心粒蛋白CPAP的分子结构及其G-box结构域的结构。G-box由单个β片层组成,可形成可溶性淀粉样原纤维。淀粉样纤维的模型表明CPAP的中心粒组装中具有结构性作用。
Centrioles are evolutionarily conserved eukaryotic organelles composed of a protein scaffold surrounded by sets of microtubules organized with a 9-fold radial symmetry. CPAP, a centriolar protein essential for microtubule recruitment, features a C-terminal domain of unknown structure, the G-box. A missense mutation in the G-box reduces affinity for the centriolar shuttling protein STIL and causes primary microcephaly. Here, we characterize the molecular architecture of CPAP and determine the G-box structure alone and in complex with a STIL fragment. The G-box comprises a single elongated β sheet capable of forming supramolecular assemblies. Structural and biophysical studies highlight the conserved nature of the CPAP-STIL complex. We propose that CPAP acts as a horizontal “strut” that joins the centriolar scaffold with microtubules, whereas G-box domains form perpendicular connections. CPAP features a long dimeric parallel coiled coil and a C-terminal domain (G-box) The G-box adopts an elongated structure with a single β sheet G-box domains form long fibrils with periodicity equivalent to centriolar spacing STIL features a conserved proline-rich motif that is important for CPAP binding Hatzopoulos et al. describe the molecular architecture of the essential centriolar protein CPAP and the structure of its G-box domain. G-box comprises a single β sheet and can form soluble amyloid-like fibrils. The model of amyloid-like fibrils suggests a structural role in centriole assembly for CPAP.
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