Interaction of NUB1 with the proteasome subunit S5a.

Interaction of NUB1 with the proteasome subunit S5a.
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NUB1 与蛋白酶体亚基 S5a 的相互作用。

DOI:
10.1016/j.bbrc.2005.09.014
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发表时间:
2005
期刊:
Biochemical and biophysical research communications.
影响因子:
--
通讯作者:
Kamitani,Tetsu
Kamitani,Tetsu
中科院分区:
--
文献类型:
--
作者:
Tanji,Kunikazu;Tanaka,Tomoaki;Kamitani,Tetsu

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NUB 1与泛素样蛋白NEDD 8相互作用,将NEDD 8单体和neddylated蛋白靶向蛋白酶体进行降解。因此,NUB 1被认为是NEDD 8缀合系统的有效下调因子。由于NUB 1具有UBL结构域,这是以前被证明是一个S5 a相互作用的基序在RAD 23/HHR 23,我们最初假设,NUB 1通过其UBL结构域与S5 a亚基的蛋白酶体相互作用。为了验证这一点,我们进行了体外GST下拉试验和酵母双杂交试验。出乎意料的是,我们的研究表明,NUB 1直接与S5 a亚基通过其氨基酸残基536和584之间的C-末端区域,而不是通过其UBL结构域相互作用。虽然UBL结构域不是NUB 1中的S5 a相互作用基序,但我们的进一步研究表明,UBL结构域是NUB 1功能所必需的。
NUB1 interacts with a ubiquitin-like protein NEDD8 to target the NEDD8 monomer and neddylated proteins to the proteasome for degradation. Therefore, NUB1 is thought to be a potent downregulator of NEDD8 conjugation system. Since NUB1 possesses a UBL domain, which was previously shown to be an S5a-interacting motif in RAD23/HHR23, we initially hypothesized that NUB1 interacts with the S5a subunit of the proteasome through its UBL domain. To examine this, we performed an in vitro GST pull-down assay and a yeast two-hybrid assay. Unexpectedly, our studies revealed that NUB1 directly interacts with the S5a subunit through its C-terminal region between amino acid residues 536 and 584, not through its UBL domain. Although the UBL domain was not an S5a-interacting motif in NUB1, our further studies revealed that the UBL domain is required for the function of NUB1.
DOI: 10.1074/jbc.273.18.11349
发表时间: 1998-05-01
影响因子: 4.8
作者:
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