微管
生物
微管形核
微管蛋白
细胞生物学
中心体
微管相关蛋白
微管组织中心
生物化学
细胞周期
细胞
作者
Yuk-Kwan Choi,Pengfei Liu,Siu Kwan Sze,Chao Dai,Robert Z. Qi
标识
DOI:10.1083/jcb.201007030
摘要
CDK5RAP2 is a human microcephaly protein that contains a γ-tubulin complex (γ-TuC)–binding domain conserved in Drosophila melanogaster centrosomin and Schizosaccharomyces pombe Mto1p and Pcp1p, which are γ-TuC–tethering proteins. In this study, we show that this domain within CDK5RAP2 associates with the γ-tubulin ring complex (γ-TuRC) to stimulate its microtubule-nucleating activity and is therefore referred to as the γ-TuRC–mediated nucleation activator (γ-TuNA). γ-TuNA but not its γ-TuC–binding-deficient mutant stimulates microtubule nucleation by purified γ-TuRC in vitro and induces extensive, γ-TuRC-dependent nucleation of microtubules in a microtubule regrowth assay. γ-TuRC bound to γ-TuNA contains NME7, FAM128A/B, and actin in addition to γ-tubulin and GCP2–6. RNA interference–mediated depletion of CDK5RAP2 impairs both centrosomal and acentrosomal microtubule nucleation, although γ-TuRC assembly is unaffected. Collectively, these results suggest that the γ-TuNA found in CDK5RAP2 has regulatory functions in γ-TuRC–mediated microtubule nucleation.
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