Ent3p is a PtdIns(3,5)P2 effector required for protein sorting to the multivesicular body

Ent3p is a PtdIns(3,5)P2 effector required for protein sorting to the multivesicular body
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DOI:
10.1016/s1534-5807(03)00238-7
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发表时间:
2003-09-01
期刊:
影响因子:
11.8
通讯作者:
Letourneur, F
Letourneur, F
中科院分区:
生物学1区
文献类型:
--
作者:
Friant, S;Pécheur, EI;Letourneur, F

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Ptdins(3,5)P-2是通过多泡体(MVB)对液泡腔进行货物选择性分选所必需的。在这里,我们表明,Ent 3 p,酵母epsin N-末端同源性(ENTH)结构域的蛋白质,是一个特定的PtdIns(3,5)P-2效应器定位于内涵体。Ent 3 p的ENTH结构域对于其Ptdins(3,5)P-2结合活性及其在体外和体内的膜相互作用是必需的。Ent 3 p是蛋白分选进入MVB所必需的,但不是内吞作用的内化步骤所必需的。Ent 3 p与网格蛋白相关,是正常肌动蛋白细胞骨架组织所必需的。我们的研究结果表明,Ent 3 p是通过PtdIns(3,5)P-2结合通过其ENTH结构域的MVB的管腔内囊泡的蛋白分选所需的。
Ptdins(3,5)P-2 is required for cargo-selective sorting to the vacuolar lumen via the multivesicular body (MVB). Here we show that Ent3p, a yeast epsin N-terminal homology (ENTH) domain-containing protein, is a specific PtdIns(3,5)P-2 effector localized to endosomes. The ENTH domain of Ent3p is essential for its Ptdins(3,5)P-2 binding activity and for its membrane interaction in vitro and in vivo. Ent3p is required for protein sorting into the MVB but not for the internalization step of endocytosis. Ent3p is associated with clathrin and is necessary for normal actin cytoskeleton organization. Our results show that Ent3p is required for protein sorting into intralumenal vesicles of the MVB through PtdIns(3,5)P-2 binding via its ENTH domain.