mVps24p functions in EGF receptor sorting/trafficking from the early endosome.

mVps24p functions in EGF receptor sorting/trafficking from the early endosome.
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mVps24p 在早期内体的 EGF 受体分选/运输中发挥作用。

DOI:
10.1016/j.yexcr.2004.11.003
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发表时间:
2005
影响因子:
3.7
通讯作者:
Bean,AndrewJ
Bean,AndrewJ
中科院分区:
医学3区
文献类型:
--
作者:
Yan,Qing;Hunt,PiperReid;Frelin,Laurence;Vida,ThomasA;Pevsner,Jonathan;Bean,AndrewJ

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酵母Vps24p(空泡蛋白分选)是蛋白复合物的一部分,被认为在胞吞作用期间在分选/运输中起作用。我们已经表征了酵母蛋白的哺乳动物同源物mVps24 p,并研究了其在表皮生长因子受体转运中的作用。内源性mVps24 p分布在细胞质和斑点和部分共定位与标记的trans-Golgi网络。hr或ATP酶活性缺陷的mVps4p突变体的外源表达引起mVps24p和M6PR重新分布到所得的成簇/扩大的早期内体。mVps24p N-末端片段的表达,与磷脂酰肌醇3,5-二磷酸相互作用,但不与mVps4p,产生扩大的早期内涵体。更重要的是,mVps24p的N-末端片段不仅增强了再循环,而且减少了EGF受体的降解。这些发现与mVps24 p在早期内体运输中起作用的模型一致。
Yeast Vps24p (vacuolar protein sorting) is part of a protein complex suggested to function in sorting/trafficking during endocytosis. We have characterized a mammalian homolog of the yeast protein, mVps24p, and examined its role in epidermal growth factor receptor trafficking. Endogenous mVps24p was distributed in both cytosol and in puncta and partially colocalized with markers for the trans-Golgi network. Adventitious expression of hrs or a mVps4p mutant deficient in ATPase activity caused a redistribution of both mVps24p and the M6PR to the resultant clustered/enlarged early endosomes. Expression of an mVps24p N-terminal fragment, that interacts with phosphatidylinositol 3,5-bisphosphate but not with mVps4p, produces enlarged early endosomes. More importantly, the mVps24p N-terminal fragment resulted in not only enhanced recycling, but also decreased degradation of the EGF receptor. These findings are consistent with a model in which mVps24p has a role in trafficking from the early endosome.
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