The CEP19-RABL2 GTPase Complex Binds IFT-B to Initiate Intraflagellar Transport at the Ciliary Base.
The CEP19-RABL2 GTPase Complex Binds IFT-B to Initiate Intraflagellar Transport at the Ciliary Base.
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DOI:
10.1016/j.devcel.2017.05.016
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发表时间:
2017-07-10
影响因子:
11.8
通讯作者:
Jackson PK
中科院分区:
文献类型:
--
作者:
Kanie T;Abbott KL;Mooney NA;Plowey ED;Demeter J;Jackson PK
Highly conserved intraflagellar transport (IFT) protein complexes direct both the assembly of primary cilia and the trafficking of signaling molecules. IFT complexes initially accumulate at the base of the cilium, and periodically enter the cilium suggesting a yet identified mechanism that triggers ciliary entry of IFT complexes. Using AP-MS purification of interactors of the centrosomal and ciliopathy protein, CEP19, we identify CEP350, FOP and the RABL2 GTPase as proteins organizing the first known mechanism directing ciliary entry of IFT complexes. We discover that CEP19 is recruited to the ciliary base by the centriolar CEP350/FOP complex, and then specifically captures GTP-bound RABL2B, which is activated via its intrinsic nucleotide exchange. Activated RABL2B then captures and releases its single effector, the intraflagellar transport B holocomplex, from the large pool of pre-docked IFT-B complexes and thus initiates ciliary entry of IFT. Intraflagellar transport protein (IFT) complexes accumulate at the ciliary base and periodically enter the cilium via an unknown mechanism. Kanie et al. show that CEP19 recruits the RABL2B GTPase complex to the ciliary base where it mediates release of IFT-B from pre-docked complexes to initiate IFT ciliary entry.
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