Premium
RNF 167 targets Arl8B for degradation to regulate lysosome positioning and endocytic trafficking
Author(s) -
Deshar Rakesh,
Moon Song,
Yoo Wonjin,
Cho EunBee,
Yoon Sungjoo K.,
Yoon JongBok
Publication year - 2016
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/febs.13947
Subject(s) - endocytic cycle , lysosome , microbiology and biotechnology , degradation (telecommunications) , chemistry , biology , computer science , endocytosis , biochemistry , telecommunications , cell , enzyme
The protease‐associated ( PA ) domain‐containing E3 ubiquitin ligases are transmembrane proteins located in intracellular organelles such as the endoplasmic reticulum, endosomes, or lysosomes. The functional roles of these ubiquitin ligases are not well defined. To understand the function of E3 ubiquitin ligases, identification of their substrates is of critical importance. In this study, we describe a newly devised method based on proximity‐dependent biotin labeling to identify substrates of ubiquitin ligases. Application of this method to RING finger protein 167 ( RNF 167), a member of the PA domain‐containing E3 family, led to identification of Arl8B as its substrate. We demonstrated that RNF 167 ubiquitinates Arl8B at the lysine residue K141 and reduces the level of the Arl8B protein. Overexpression and knockdown of RNF 167 revealed its regulatory role in Arl8B‐dependent lysosome positioning and endocytic trafficking to lysosomes. Furthermore, we found that the ubiquitination‐defective Arl8B K141R mutant counteracts RNF 167 in these cellular events. These results indicate that RNF 167 plays a crucial role as an E3 ubiquitin ligase targeting Arl8B to regulate lysosome positioning and endocytic trafficking.