Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 350, Issue 2, Pages 413-423Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2006.09.064
Keywords
RILP; Rab7; VPS22; VPS25; VPS36; ESCRT-II; endosome; MVB
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RILP is emerging as a key regulator of late endocytic pathway by functioning as a downstream effector of activated Rab7 and Rab34, while ESCRT-I -> ESCRT-II -> ESCRT-III machinery acts in sorting proteins to the multivesicular body (MVB) initiated at the early/ sorting endosome. We show here that the early machinery is integrated with the late machinery through a novel regulatory loop in which RILP interacts with VPS22 and VPS36 of ESCRT-II to mediate their membrane recruitment. The N-terminal and C-terminal half of RILP mediate interaction with VPS22 and VPS36, respectively. Overexpression of RILP leads to enlarged and clustered MVBs marked by lysobisphosphatidic acid (LBPA). In addition, RILP or its C-terminal fragment causes a retardation of sorting internalized EGF to the degradation route at the level of sorting endosomes marked by EEA1. We propose that RILP -> ESCRT-II serves as a regulatory/ feedback loop to govern the coordination of early and late parts of the endocytic pathway. (c) 2006 Elsevier Inc. All rights reserved.
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