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:
影响因子:
--
通讯作者:
Rios RM
中科院分区:
文献类型:
--
作者:
Infante C;Ramos-Morales F;Fedriani C;Bornens M;Rios RM
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.
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影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
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The Journal of cell biology
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发表时间:
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通讯作者:
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