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
中科院分区:
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
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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影响因子:
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作者:
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影响因子:
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DOI:
10.1083/jcb.200108088
发表时间:
2002-01-07
期刊:
The Journal of cell biology
影响因子:
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