Augmin-dependent microtubule nucleation at microtubule walls in the spindle.
Augmin-dependent microtubule nucleation at microtubule walls in the spindle.
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DOI:
10.1083/jcb.201304031
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发表时间:
2013-07-08
期刊:
影响因子:
--
通讯作者:
Goshima G
中科院分区:
文献类型:
--
作者:
Kamasaki T;O'Toole E;Kita S;Osumi M;Usukura J;McIntosh JR;Goshima G
Electron tomography and 3D modeling identifies augmin-dependent connections between the wall of one microtubule and the minus end of a neighboring one in the spindle. The formation of a functional spindle requires microtubule (MT) nucleation from within the spindle, which depends on augmin. How augmin contributes to MT formation and organization is not known because augmin-dependent MTs have never been specifically visualized. In this paper, we identify augmin-dependent MTs and their connections to other MTs by electron tomography and 3D modeling. In metaphase spindles of human cells, the minus ends of MTs were located both around the centriole and in the body of the spindle. When augmin was knocked down, the latter population of MTs was significantly reduced. In control cells, we identified connections between the wall of one MT and the minus end of a neighboring MT. Interestingly, the connected MTs were nearly parallel, unlike other examples of end–wall connections between cytoskeletal polymers. Our observations support the concept of augmin-dependent MT nucleation at the walls of existing spindle MTs. Furthermore, they suggest a mechanism for maintaining polarized MT organization, even when noncentrosomal MT initiation is widespread.
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影响因子:
3.7
作者:
O'Toole E;Greenan G;Lange KI;Srayko M;Müller-Reichert T
通讯作者:
Müller-Reichert T
DOI:
10.1083/jcb.201202135
发表时间:
2012-08-06
期刊:
The Journal of cell biology
影响因子:
--
作者:
Courtois A;Schuh M;Ellenberg J;Hiiragi T
通讯作者:
Hiiragi T
影响因子:
3
作者:
Kremer, JR;Mastronarde, DN;McIntosh, JR
通讯作者:
McIntosh, JR
影响因子:
64.8
作者:
Heald, R;Tournebize, R;Karsenti, E
通讯作者:
Karsenti, E
DOI:
10.1073/pnas.1106223108
发表时间:
2011-07-12
影响因子:
11.1
作者:
Johmura, Yoshikazu;Soung, Nak-Kyun;Lee, Kyung S.
通讯作者:
Lee, Kyung S.