Management of the endoplasmic reticulum stress by activation of the heat shock response in yeast
Artikel i vetenskaplig tidskrift, 2014

In yeast Saccharomyces cerevisiae, accumulation of misfolded proteins in the endoplasmic reticulum (ER) causes ER stress and activates the unfolded protein response (UPR), which is mediated by Hac1p. The heat shock response (HSR) mediated by Hsf1p, mainly regulates cytosolic processes and protects the cell from stresses. Here, we find that a constitutive activation of the HSR could increase ER stress resistance in both wild-type and UPR-deficient cells. Activation of HSR decreased UPR activation in the WT (as shown by the decreased HAC1 mRNA splicing). We analyzed the genome-wide transcriptional response in order to propose regulatory mechanisms that govern the interplay between UPR and HSR and followed up for the hypotheses by experiments in vivo and in vitro. Interestingly, we found that the regulation of ER stress response via HSR is (1) only partially dependent on over-expression of Kar2p (ER resident chaperone induced by ER stress); (2) does not involve the increase in protein turnover via the proteasome activity; (3) is related to the oxidative stress response. From the transcription data, we also propose that HSR enhances ER stress resistance mainly through facilitation of protein folding and secretion. We also find that HSR coordinates multiple stress-response pathways, including the repression of the overall transcription and translation.

oxidative stress response

IN-VIVO

SACCHAROMYCES-CEREVISIAE

ANALYSIS

proteasome activity

HSF1

heat shock response

ER-ASSOCIATED DEGRADATION

GENOME-WIDE

STRESS

OXIDATIVE

transcriptome analysis

TRANSCRIPTION FACTOR

endoplasmic reticulum stress

EXPRESSION

UNFOLDED PROTEIN RESPONSE

QUALITY-CONTROL

Författare

Jin Hou

Kemi- och bioteknik, Livsvetenskaper, Systembiologi

H. T. Tang

Shandong University

Zihe Liu

Kemi- och bioteknik, Livsvetenskaper, Systembiologi

Tobias Österlund

Kemi- och bioteknik, Livsvetenskaper, Systembiologi

Jens B Nielsen

Kemi- och bioteknik, Livsvetenskaper, Systembiologi

Dina Petranovic Nielsen

Kemi- och bioteknik, Livsvetenskaper, Systembiologi

FEMS Yeast Research

1567-1356 (ISSN) 1567-1364 (eISSN)

Vol. 14 481-494

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Mikrobiologi

Styrkeområden

Livsvetenskaper och teknik

DOI

10.1111/1567-1364.12125