Different ubiquitin signals act at the Golgi and plasma membrane to direct GAP1 trafficking.

Different ubiquitin signals act at the Golgi and plasma membrane to direct GAP1 trafficking.
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不同的泛素信号作用于高尔基体和质膜以指导 GAP1 运输。

DOI:
10.1091/mbc.e07-06-0627
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发表时间:
2008
影响因子:
3.3
通讯作者:
Kaiser,ChrisA
Kaiser,ChrisA
中科院分区:
生物学3区
文献类型:
--
作者:
Risinger,AprilL;Kaiser,ChrisA

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The high capacity general amino acid permease, Gap1p, inSaccharomyces cerevisiaeis distributed between the plasma membrane and internal compartments according to availability of amino acids. When internal amino acid levels are low, Gap1p is localized to the plasma membrane where it imports available amino acids from the medium. When sufficient amino acids are imported, Gap1p at the plasma membrane is endocytosed and newly synthesized Gap1p is delivered to the vacuole; both sorting steps require Gap1p ubiquitination. Although it has been suggested that identicaltrans-acting factors and Gap1p ubiquitin acceptor sites are involved in both processes, we define unique requirements for each of the ubiquitin-mediated sorting steps involved in delivery of Gap1p to the vacuole upon amino acid addition. Our finding that distinct ubiquitin-mediated sorting steps employ uniquetrans-acting factors, ubiquitination sites on Gap1p, and types of ubiquitination demonstrates a previously unrecognized level of specificity in ubiquitin-mediated protein sorting.
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