Open AccessThe yeast stress inducible Ssa Hsp70 reduces α-synuclein toxicity by promoting its degradation through autophagy
Author(s) -
A. P. Gupta,
Anuradhika Puri,
Prashant Singh,
Surabhi Sonam,
Richa Pandey,
Deepak Sharma
Publication year - 2018
Publication title -
plos genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.587
H-Index - 233
eISSN - 1553-7404
pISSN - 1553-7390
DOI - 10.1371/journal.pgen.1007751
Subject(s) - hsp70 , autophagy , biology , gene isoform , toxicity , yeast , microbiology and biotechnology , intracellular , cytosol , protein aggregation , heat shock protein , saccharomyces cerevisiae , biochemistry , enzyme , chemistry , gene , apoptosis , organic chemistry
The mechanism underlying the role of Hsp70s in toxicity associated with intracellular accumulation of toxic protein inclusions is under intense investigation. In current study, we examined the roles of all different isoforms of yeast cytosolic Ssa Hsp70 on α-synuclein mediated cellular toxicity. The study showed that yeast cells expressing stress-inducible Ssa3 or Ssa4 as sole Ssa Hsp70 isoforms, reduced α-synuclein toxicity better than those expressing a constitutive counterpart. The protective effect of stress-inducible Ssa Hsp70s was not α-syn specific, but more general to other inclusion forming proteins such as polyQ. We show that the protective effect is not by induction of a general stress response in Ssa3 cells rather by promoting α-synuclein degradation through autophagy. The present study revealed that effect of Hsp70s was isoform dependent, and that autophagy protects Ssa3 cells from the deleterious effects of toxic protein inclusions.