Ubiquitination of the peroxisomal import receptor Pex5p is required for its recycling.

Ubiquitination of the peroxisomal import receptor Pex5p is required for its recycling.
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DOI:
10.1083/jcb.200611012
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发表时间:
2007-04-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Erdmann R
Erdmann R
中科院分区:
其他
文献类型:
--
作者:
Platta HW;El Magraoui F;Schlee D;Grunau S;Girzalsky W;Erdmann R

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Pex5p 是含有 I 型信号序列 (PTS1) 的过氧化物酶体基质蛋白的重要受体,在酿酒酵母中被单泛素化和多泛素化。我们将 Pex5p 确定为 Pex4p 依赖性单泛素化的分子靶标,并证明作为受体循环的一部分,受体的多泛素化或单泛素化对于蛋白质从过氧化物酶体膜到细胞质的 ATP 依赖性释放是必需的。因此,过氧化物酶体输入途径的能量需求必须通过第二个 ATP 依赖性步骤来延长,即受体单泛素化。
Pex5p, which is the import receptor for peroxisomal matrix proteins harboring a type I signal sequence (PTS1), is mono- and polyubiquitinated in Saccharomyces cerevisiae. We identified Pex5p as a molecular target for Pex4p-dependent monoubiquitination and demonstrated that either poly- or monoubiquitination of the receptor is required for the ATP-dependent release of the protein from the peroxisomal membrane to the cytosol as part of the receptor cycle. Therefore, the energy requirement of the peroxisomal import pathway has to be extended by a second ATP-dependent step, namely receptor monoubiquitination.
DOI: 10.1083/jcb.144.6.1151
发表时间: 1999-03-22
期刊: The Journal of cell biology
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