The dynamin-like GTPase Sey1p mediates homotypic ER fusion in S. cerevisiae.
The dynamin-like GTPase Sey1p mediates homotypic ER fusion in S. cerevisiae.
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DOI:
10.1083/jcb.201111115
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发表时间:
2012-04-16
期刊:
影响因子:
--
通讯作者:
Prinz WA
中科院分区:
文献类型:
--
作者:
Anwar K;Klemm RW;Condon A;Severin KN;Zhang M;Ghirlando R;Hu J;Rapoport TA;Prinz WA
Budding yeast Sey1p functions analogously to mammalian atlastins in mediating ER fusion through a mechanism that is redundant with a second, ER SNARE-mediated fusion mechanism. The endoplasmic reticulum (ER) forms a network of tubules and sheets that requires homotypic membrane fusion to be maintained. In metazoans, this process is mediated by dynamin-like guanosine triphosphatases (GTPases) called atlastins (ATLs), which are also required to maintain ER morphology. Previous work suggested that the dynamin-like GTPase Sey1p was needed to maintain ER morphology in Saccharomyces cerevisiae. In this paper, we demonstrate that Sey1p, like ATLs, mediates homotypic ER fusion. The absence of Sey1p resulted in the ER undergoing delayed fusion in vivo and proteoliposomes containing purified Sey1p fused in a GTP-dependent manner in vitro. Sey1p could be partially replaced by ATL1 in vivo. Like ATL1, Sey1p underwent GTP-dependent dimerization. We found that the residual ER–ER fusion that occurred in cells lacking Sey1p required the ER SNARE Ufe1p. Collectively, our results show that Sey1p and its homologues function analogously to ATLs in mediating ER fusion. They also indicate that S. cerevisiae has an alternative fusion mechanism that requires ER SNAREs.
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DOI:
10.1083/jcb.201105006
发表时间:
2011-11-14
期刊:
The Journal of cell biology
影响因子:
--
作者:
Morin-Leisk J;Saini SG;Meng X;Makhov AM;Zhang P;Lee TH
通讯作者:
Lee TH
DOI:
10.1073/pnas.1106421108
发表时间:
2011-09-27
影响因子:
11.1
作者:
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通讯作者:
Daga, Andrea
影响因子:
4.6
作者:
Zhao, Huaying;Brown, Patrick H.;Schuck, Peter
通讯作者:
Schuck, Peter
影响因子:
7.2
作者:
Zheng, HQ;Kunst, L;Moore, I
通讯作者:
Moore, I
影响因子:
3.3
作者:
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通讯作者:
Walter, P