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Trs130 Participates in Autophagy Through GTPases Ypt31/32 in Saccharomyces cerevisiae
Author(s) -
Zou Shenshen,
Chen Yong,
Liu Yutao,
Segev Nava,
Yu Sidney,
Liu Yan,
Min Gaoyi,
Ye Min,
Zeng Yan,
Zhu Xiaoping,
Hong Bing,
Björn Lars Olof,
Liang Yongheng,
Li Shaoshan,
Xie Zhiping
Publication year - 2013
Publication title -
traffic
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.677
H-Index - 130
eISSN - 1600-0854
pISSN - 1398-9219
DOI - 10.1111/tra.12024
Subject(s) - autophagy , microbiology and biotechnology , atg8 , rab , gtpase , biology , vacuole , golgi apparatus , guanine nucleotide exchange factor , vesicular transport protein , transport protein , atg5 , mutant , cytoplasm , bag3 , autophagosome , retromer , biochemistry , vesicle , membrane , gene , endoplasmic reticulum , apoptosis
Trs130 is a specific component of the transport protein particle II complex, which functions as a guanine nucleotide exchange factor ( GEF ) for Rab GTPases Ypt31/32. Ypt31/32 is known to be involved in autophagy, although the precise mechanism has not been thoroughly studied. In this study, we investigated the potential involvement of Trs130 in autophagy and found that both the cytoplasm‐to‐vacuole targeting (Cvt) pathway and starvation‐induced autophagy were defective in a trs130ts ( trs130 temperature‐sensitive) mutant. Mutant cells could not transport Atg8 and Atg9 to the pre‐autophagosomal structure/phagophore assembly site ( PAS ) properly, resulting in multiple Atg8 dots and Atg9 dots dispersed in the cytoplasm. Some dots were trapped in the trans‐Golgi. Genetic studies showed that the effect of the Trs130 mutation was downstream of Atg5 and upstream of Atg1, Atg13, Atg9 and Atg14 on the autophagic pathway. Furthermore, overexpression of Ypt31 or Ypt32, but not of Ypt1, rescued autophagy defects in trs130ts and trs65ts ( Trs130‐ HA Trs120‐myc trs65Δ ) mutants. Our data provide mechanistic insight into how Trs130 participates in autophagy and suggest that vesicular trafficking regulated by GTPases / GEFs is important in the transport of autophagy proteins from the trans‐Golgi to the PAS .