Shedding light on a Group IV (ECF11) alternative σ factor

Journal Article · 19 May 2019 · Molecular Microbiology

DOI: https://doi.org/10.1111/mmi.14280 · OSTI ID:1546720

Donohue, Timothy J.  ^[1]

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1. Univ. of Wisconsin, Madison, WI (United States). Bacteriology Dept., Great Lakes Bioenergy Research Center Wisconsin Energy Inst.; University of Wisconsin-Madison Department of Bacteriology

This year marks the 50^th anniversary of the discovery of σ⁷⁰ as a protein factor that was needed for bacterial RNA polymerase to accurately transcribe a promoter in vitro. It was 25 years later that the Group IV alternative σs were described as a distinct family of proteins related to σ⁷⁰. In the intervening time, there has been an ever-growing list of Group IV σs, numbers of genes they transcribe, insight into the diverse suite of processes they control, and appreciation for their impact on bacterial lifestyles. This work summarizes knowledge of the Rhodobacter sphaeroides σ^E-ChrR pair, a member of the ECF11 subfamily of Group IV alternative σs, in protecting cells from the reactive oxygen species, singlet oxygen. It describes lessons learned from analyzing ChrR, a zinc-dependent anti-σ factor, that are generally applicable to Group IV σs and relevant to the response to single oxygen. This MicroReview also illustrates insights into stress responses in this and other bacteria that have been acquired by analyzing or modeling the activity of the σ^E-ChrR across the bacterial phylogeny.

• Research Organization: Univ. of Wisconsin, Madison, WI (United States). Great Lakes Bioenergy Research Center
• Sponsoring Organization: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
• Grant/Contract Number: SC0018409
• OSTI ID: 1546720
• Journal Information: Molecular Microbiology, Journal Name: Molecular Microbiology Journal Issue: 2 Vol. 112; ISSN 0950-382X
• Publisher: WileyCopyright Statement
• Country of Publication: United States
• Language: English