Ltc1 is an ER-localized sterol transporter and a component of ER-mitochondria and ER-vacuole contacts.
Ltc1 is an ER-localized sterol transporter and a component of ER-mitochondria and ER-vacuole contacts.
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DOI:
10.1083/jcb.201502033
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发表时间:
2015-05-25
期刊:
影响因子:
--
通讯作者:
Nunnari J
中科院分区:
文献类型:
--
作者:
Murley A;Sarsam RD;Toulmay A;Yamada J;Prinz WA;Nunnari J
Cytological and biochemical analyses show that Ylr072w, here renamed Lipid transfer at contact site 1 (Ltc1), is a sterol transport protein localized to both ER–mitochondria and ER–vacuole contact sites in partnership with the organelle-specific components Tom70/81 and Vac8, respectively. Organelle contact sites perform fundamental functions in cells, including lipid and ion homeostasis, membrane dynamics, and signaling. Using a forward proteomics approach in yeast, we identified new ER–mitochondria and ER–vacuole contacts specified by an uncharacterized protein, Ylr072w. Ylr072w is a conserved protein with GRAM and VASt domains that selectively transports sterols and is thus termed Ltc1, for Lipid transfer at contact site 1. Ltc1 localized to ER–mitochondria and ER–vacuole contacts via the mitochondrial import receptors Tom70/71 and the vacuolar protein Vac8, respectively. At mitochondria, Ltc1 was required for cell viability in the absence of Mdm34, a subunit of the ER–mitochondria encounter structure. At vacuoles, Ltc1 was required for sterol-enriched membrane domain formation in response to stress. Increasing the proportion of Ltc1 at vacuoles was sufficient to induce sterol-enriched vacuolar domains without stress. Thus, our data support a model in which Ltc1 is a sterol-dependent regulator of organelle and cellular homeostasis via its dual localization to ER–mitochondria and ER–vacuole contact sites.
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影响因子:
16
作者:
Dubouloz, F;Deloche, O;De Virgillo, C
通讯作者:
De Virgillo, C
DOI:
10.1111/j.1600-0854.2008.00789.x
发表时间:
2008-09
期刊:
Traffic (Copenhagen, Denmark)
影响因子:
--
作者:
Millen JI;Pierson J;Kvam E;Olsen LJ;Goldfarb DS
通讯作者:
Goldfarb DS
影响因子:
3.7
作者:
McDowell EN;Kisielewski AE;Pike JW;Franco HL;Yao HH;Johnson KJ
通讯作者:
Johnson KJ
影响因子:
6.8
作者:
Grove, Tijana Z.;Cortajarena, Aitziber L.;Regan, Lynne
通讯作者:
Regan, Lynne
影响因子:
7.7
作者:
Kondo-Okamoto, Noriko;Shaw, Janet M.;Okamoto, Koji
通讯作者:
Okamoto, Koji