A network of nuclear envelope membrane proteins linking centromeres to microtubules.

A network of nuclear envelope membrane proteins linking centromeres to microtubules.
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DOI:
10.1016/j.cell.2008.06.022
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发表时间:
2008-08-08
期刊:
影响因子:
64.5
通讯作者:
Blobel, Guenter
Blobel, Guenter
中科院分区:
生物学1区
文献类型:
--
作者:
King, Megan C.;Drivas, Theodore G.;Blobel, Guenter

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In the fission yeast S. pombe, nuclei are actively positioned at the cell center by microtubules. Here we show that cytoplasmic microtubules are mechanically coupled to the nuclear heterochromatin through proteins embedded in the nuclear envelope. This includes an integral outer nuclear membrane protein of the KASH family (Kms2) and two integral inner nuclear membrane proteins: the SUN-domain protein Sad1 and the novel, conserved protein Ima1. Ima1 specifically binds to heterochromatic regions and promotes the tethering of centromeric DNA to the SUN-KASH complex. In the absence of Ima1, or in cells harboring mutations in the centromeric Ndc80 complex, inefficient coupling of centromeric heterochromatin to Sad1 leads to striking defects in the ability of the nucleus to tolerate microtubule-dependent forces, leading to changes in nuclear shape, loss of spindle pole body components from the nuclear envelope, and partial dissociation of SUN-KASH complexes. This work highlights a novel means of communication between cytoplasmic microtubules and chromatin.
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