The Evolution of SlyA/RovA Transcription Factors from Repressors to Countersilencers in Enterobacteriaceae
Abstract
Gene duplication and subsequent evolutionary divergence have allowed conserved proteins to develop unique roles. The MarR family of transcription factors (TFs) has undergone extensive duplication and diversification in bacteria, where they act as environmentally responsive repressors of genes encoding efflux pumps that confer resistance to xenobiotics, including many antimicrobial agents. We have performed structural, functional, and genetic analyses of representative members of the SlyA/RovA lineage of MarR TFs, which retain some ancestral functions, including repression of their own expression and that of divergently transcribed multidrug efflux pumps, as well as allosteric inhibition by aromatic carboxylate compounds. However, SlyA and RovA have acquired the ability to countersilence horizontally acquired genes, which has greatly facilitated the evolution of Enterobacteriaceaeby horizontal gene transfer. SlyA/RovA TFs in different species have independently evolved novel regulatory circuits to provide the enhanced levels of expression required for their new role. Moreover, in contrast to MarR, SlyA is not responsive to copper. These observations demonstrate the ability of TFs to acquire new functions as a result of evolutionary divergence of bothcis-regulatory sequences and intransinteractions with modulatory ligands. IMPORTANCEBacteria primarily evolve via horizontal gene transfer, acquiring new traits such as virulence and antibiotic resistance in single transfer events. However,more »
- Authors:
-
- Univ. of Washington, Seattle, WA (United States). Dept. of Laboratory Medicine
- Univ. of Washington, Seattle, WA (United States). Dept. of Biochemistry
- Univ. of Washington, Seattle, WA (United States). Dept. of Biological Structure
- Univ. of Washington, Seattle, WA (United States). Dept. of Biochemistry Univ. of Washington, Seattle, WA (United States). Dept. of Biological Structure
- Univ. of Louisville School of Medicine, Louisville, KY (United States). Dept. of Microbiology and Immunology and the Center for Predictive Medicine for Biodefense and Emerging Infectious Diseases
- Univ. of Washington, Seattle, WA (United States). Dept. of Microbiology
- Univ. of North Carolina School of Medicine, Chapel Hill, NC (United States). Dept.of Microbiology and Immunology; Univ. of North Carolina School of Medicine, Chapel Hill, NC (United States). Dept.of Genetics
- Univ. of Washington, Seattle, WA (United States). Dept. of Medicine
- Univ. of Washington, Seattle, WA (United States). Dept. of Laboratory Medicine; Univ. of Washington, Seattle, WA (United States). Dept. of Microbiology
- Univ. of Illinois, Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Cancer Institute (NCI); National Institute of General Medical Sciences
- OSTI Identifier:
- 1626076
- Grant/Contract Number:
- AC02-06CH11357; ACB-12002; AGM-12006
- Resource Type:
- Accepted Manuscript
- Journal Name:
- mBio (Online)
- Additional Journal Information:
- Journal Name: mBio (Online); Journal Volume: 10; Journal Issue: 2; Journal ID: ISSN 2150-7511
- Publisher:
- American Society for Microbiology
- Country of Publication:
- United States
- Language:
- English
- Subject:
- Microbiology; SlyA, countersilencing; evolution; gene regulation; transcription factors
Citation Formats
Will, W. Ryan, Brzovic, Peter, Le Trong, Isolde, Stenkamp, Ronald E., Lawrenz, Matthew B., Karlinsey, Joyce E., Navarre, William W., Main-Hester, Kara, Miller, Virginia L., Libby, Stephen J., Fang, Ferric C., and Freitag, Nancy E. The Evolution of SlyA/RovA Transcription Factors from Repressors to Countersilencers in Enterobacteriaceae. United States: N. p., 2019.
Web. doi:10.1128/mbio.00009-19.
Will, W. Ryan, Brzovic, Peter, Le Trong, Isolde, Stenkamp, Ronald E., Lawrenz, Matthew B., Karlinsey, Joyce E., Navarre, William W., Main-Hester, Kara, Miller, Virginia L., Libby, Stephen J., Fang, Ferric C., & Freitag, Nancy E. The Evolution of SlyA/RovA Transcription Factors from Repressors to Countersilencers in Enterobacteriaceae. United States. https://doi.org/10.1128/mbio.00009-19
Will, W. Ryan, Brzovic, Peter, Le Trong, Isolde, Stenkamp, Ronald E., Lawrenz, Matthew B., Karlinsey, Joyce E., Navarre, William W., Main-Hester, Kara, Miller, Virginia L., Libby, Stephen J., Fang, Ferric C., and Freitag, Nancy E. Tue .
"The Evolution of SlyA/RovA Transcription Factors from Repressors to Countersilencers in Enterobacteriaceae". United States. https://doi.org/10.1128/mbio.00009-19. https://www.osti.gov/servlets/purl/1626076.
@article{osti_1626076,
title = {The Evolution of SlyA/RovA Transcription Factors from Repressors to Countersilencers in Enterobacteriaceae},
author = {Will, W. Ryan and Brzovic, Peter and Le Trong, Isolde and Stenkamp, Ronald E. and Lawrenz, Matthew B. and Karlinsey, Joyce E. and Navarre, William W. and Main-Hester, Kara and Miller, Virginia L. and Libby, Stephen J. and Fang, Ferric C. and Freitag, Nancy E.},
abstractNote = {Gene duplication and subsequent evolutionary divergence have allowed conserved proteins to develop unique roles. The MarR family of transcription factors (TFs) has undergone extensive duplication and diversification in bacteria, where they act as environmentally responsive repressors of genes encoding efflux pumps that confer resistance to xenobiotics, including many antimicrobial agents. We have performed structural, functional, and genetic analyses of representative members of the SlyA/RovA lineage of MarR TFs, which retain some ancestral functions, including repression of their own expression and that of divergently transcribed multidrug efflux pumps, as well as allosteric inhibition by aromatic carboxylate compounds. However, SlyA and RovA have acquired the ability to countersilence horizontally acquired genes, which has greatly facilitated the evolution of Enterobacteriaceaeby horizontal gene transfer. SlyA/RovA TFs in different species have independently evolved novel regulatory circuits to provide the enhanced levels of expression required for their new role. Moreover, in contrast to MarR, SlyA is not responsive to copper. These observations demonstrate the ability of TFs to acquire new functions as a result of evolutionary divergence of bothcis-regulatory sequences and intransinteractions with modulatory ligands. IMPORTANCEBacteria primarily evolve via horizontal gene transfer, acquiring new traits such as virulence and antibiotic resistance in single transfer events. However, newly acquired genes must be integrated into existing regulatory networks to allow appropriate expression in new hosts. This is accommodated in part by the opposing mechanisms of xenogeneic silencing and countersilencing. An understanding of these mechanisms is necessary to understand the relationship between gene regulation and bacterial evolution. Here we examine the functional evolution of an important lineage of countersilencers belonging to the ancient MarR family of classical transcriptional repressors. We show that although members of the SlyA lineage retain some ancestral features associated with the MarR family, theircis-regulatory sequences have evolved significantly to support their new function. Understanding the mechanistic requirements for countersilencing is critical to understanding the pathoadaptation of emerging pathogens and also has practical applications in synthetic biology.},
doi = {10.1128/mbio.00009-19},
journal = {mBio (Online)},
number = 2,
volume = 10,
place = {United States},
year = {Tue Mar 05 00:00:00 EST 2019},
month = {Tue Mar 05 00:00:00 EST 2019}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
MarR Family Transcription Factors from Burkholderia Species: Hidden Clues to Control of Virulence-Associated Genes
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The MarR-Type Regulator MalR Is Involved in Stress-Responsive Cell Envelope Remodeling in Corynebacterium glutamicum
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SlyA Transcriptional Regulator Is Not Directly Affected by ppGpp Levels
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