GMAP-210, A cis-Golgi network-associated protein, is a minus end microtubule-binding protein.

GMAP-210, A cis-Golgi network-associated protein, is a minus end microtubule-binding protein.
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DOI:
10.1083/jcb.145.1.83
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发表时间:
1999-04-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rios RM
Rios RM
中科院分区:
其他
文献类型:
--
作者:
Infante C;Ramos-Morales F;Fedriani C;Bornens M;Rios RM

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我们报道了一个分子质量为210kD的外周高尔基蛋白定位于顺式高尔基网络(Rios,R.M.,A.M.Tassin,C.Celati,C.Antony,M.C.Boissier,J.C.Homberg和M.Bornens)。1994年。J.细胞生物学。125:997-1013)是一种微管结合蛋白,与稳定的微管亚群原位结合。这种蛋白质,现在被称为GMAP-210,高尔基微管相关蛋白210,在体外与微管的相互作用是直接的、紧密的和核苷酸无关的。生化分析进一步表明,GMAP-210与微管末端特异结合。编码GMAP-210的全长cDNA预测了一个由1,979个氨基酸组成的蛋白质,其中有一个很长的中心螺旋结构域。体外缺失分析表明,GMAP-210的COOH末端与微管结合,而NH2末端与高尔基膜结合。GMAP-210编码基因的过表达导致高尔基体显著增大和微管网络的扰动。当缺乏COOH末端结构域的突变体被表达时,这些效应不会发生。当与绿色荧光蛋白融合后,NH2末端结构域与顺式高尔基网络结合,而COOH末端微管结合域定位于中心体。总之,这些数据支持这样的观点,即GMAP-210用于将顺式高尔基网络连接到中心体有核微管的负端。此外,这种相互作用似乎对确保高尔基体的适当形态和大小至关重要。
We report that a peripheral Golgi protein with a molecular mass of 210 kD localized at the cis-Golgi network (Rios, R.M., A.M. Tassin, C. Celati, C. Antony, M.C. Boissier, J.C. Homberg, and M. Bornens. 1994. J. Cell Biol. 125:997–1013) is a microtubule-binding protein that associates in situ with a subpopulation of stable microtubules. Interaction of this protein, now called GMAP-210, for Golgi microtubule-associated protein 210, with microtubules in vitro is direct, tight and nucleotide-independent. Biochemical analysis further suggests that GMAP-210 specifically binds to microtubule ends. The full-length cDNA encoding GMAP-210 predicts a protein of 1,979 amino acids with a very long central coiled-coil domain. Deletion analyses in vitro show that the COOH terminus of GMAP-210 binds to microtubules whereas the NH2 terminus binds to Golgi membranes. Overexpression of GMAP-210–encoding cDNA induced a dramatic enlargement of the Golgi apparatus and perturbations in the microtubule network. These effects did not occur when a mutant lacking the COOH-terminal domain was expressed. When transfected in fusion with the green fluorescent protein, the NH2-terminal domain associated with the cis-Golgi network whereas the COOH-terminal microtubule-binding domain localized at the centrosome. Altogether these data support the view that GMAP-210 serves to link the cis-Golgi network to the minus ends of centrosome-nucleated microtubules. In addition, this interaction appears essential for ensuring the proper morphology and size of the Golgi apparatus.
gp74顺式 - 高尔基网络的膜糖蛋白,该网络循环通过内质网和中间室。
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