Differential role of cytosolic Hsp70s in longevity assurance and protein quality control.

Abstract:

:70 kDa heat shock proteins (Hsp70) are essential chaperones of the protein quality control network; vital for cellular fitness and longevity. The four cytosolic Hsp70's in yeast, Ssa1-4, are thought to be functionally redundant but the absence of Ssa1 and Ssa2 causes a severe reduction in cellular reproduction and accelerates replicative aging. In our efforts to identify which Hsp70 activities are most important for longevity assurance, we systematically investigated the capacity of Ssa4 to carry out the different activities performed by Ssa1/2 by overproducing Ssa4 in cells lacking these Hsp70 chaperones. We found that Ssa4, when overproduced in cells lacking Ssa1/2, rescued growth, mitigated aggregate formation, restored spatial deposition of aggregates into protein inclusions, and promoted protein degradation. In contrast, Ssa4 overproduction in the Hsp70 deficient cells failed to restore the recruitment of the disaggregase Hsp104 to misfolded/aggregated proteins, to fully restore clearance of protein aggregates, and to bring back the formation of the nucleolus-associated aggregation compartment. Exchanging the nucleotide-binding domain of Ssa4 with that of Ssa1 suppressed this 'defect' of Ssa4. Interestingly, Ssa4 overproduction extended the short lifespan of ssa1Δ ssa2Δ mutant cells to a lifespan comparable to, or even longer than, wild type cells, demonstrating that Hsp104-dependent aggregate clearance is not a prerequisite for longevity assurance in yeast.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Andersson R,Eisele-Bürger AM,Hanzén S,Vielfort K,Öling D,Eisele F,Johansson G,Gustafsson T,Kvint K,Nyström T

doi

10.1371/journal.pgen.1008951

subject

Has Abstract

pub_date

2021-01-11 00:00:00

pages

e1008951

issue

1

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-20-00972

journal_volume

17

pub_type

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