Genomewide analysis reveals novel pathways affecting endoplasmic reticulum homeostasis, protein modification and quality control.

Abstract:

:To gain new mechanistic insight into ER homeostasis and the biogenesis of secretory proteins, we screened a genomewide collection of yeast mutants for defective intracellular retention of the ER chaperone, Kar2p. We identified 87 Kar2p-secreting strains, including a number of known components in secretory protein modification and sorting. Further characterization of the 73 nonessential Kar2p retention mutants revealed roles for a number of novel gene products in protein glycosylation, GPI-anchor attachment, ER quality control, and retrieval of escaped ER residents. A subset of these mutants, required for ER retrieval, included the GET complex and two novel proteins that likely function similarly in membrane insertion of tail-anchored proteins. Finally, the variant histone, Htz1p, and its acetylation state seem to play an important role in maintaining ER retrieval pathways, suggesting a surprising link between chromatin remodeling and ER homeostasis.

journal_name

Genetics

journal_title

Genetics

authors

Copic A,Dorrington M,Pagant S,Barry J,Lee MC,Singh I,Hartman JL 4th,Miller EA

doi

10.1534/genetics.109.101105

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

757-69

issue

3

eissn

0016-6731

issn

1943-2631

pii

genetics.109.101105

journal_volume

182

pub_type

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