Cited by 108Bacterial Genetics and BiotechnologyGene Regulatory Network AnalysisEscherichia coli research studies

Asymmetric cross‐regulation between the nitrate‐responsive NarX–NarL and NarQ–NarP two‐component regulatory systems from Escherichia coli K‐12

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Noriega, Chris E., Lin, Hsia‐Yin, Chen, Li‐Ling, Williams, Stanly B., Stewart, Valley·2010·Molecular Microbiology

Abstract

The NarX-NarL and NarQ-NarP sensor-response regulator pairs control Escherichia coli gene expression in response to nitrate and nitrite. Previous analysis suggests that the Nar two-component systems form a cross-regulation network in vivo. Here we report on the kinetics of phosphoryl transfer between different sensor-regulator combinations in vitro. NarX exhibited a noticeable kinetic preference for NarL over NarP, whereas NarQ exhibited a relatively slight kinetic preference for NarL. These findings were substantiated in reactions containing one sensor and both response regulators, or with two sensors and a single response regulator. We isolated 21 NarX mutants with missense substitutions in the cytoplasmic central and transmitter modules. These confer phenotypes that reflect defects in phospho-NarL dephosphorylation. Five of these mutants, all with substitutions in the transmitter DHp domain, also exhibited NarP-blind phenotypes. Phosphoryl transfer assays in vitro confirmed that these NarX mutants have defects in catalysing NarP phosphorylation. By contrast, the corresponding NarQ mutants conferred phenotypes indicating comparable interactions with both NarP and NarL. Our overall results reveal asymmetry in the Nar cross-regulation network, such that NarQ interacts similarly with both response regulators, whereas NarX interacts preferentially with NarL.

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Crossref · 10.1111/j.1365-2958.2009.06987.x

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  1. Maloy SR Stewart VJ Taylor RK 1996 Genetic analysis of pathogeneic bacteria. A laboratory manual Cold Spring Harbor, N. Y Cold Spring Harbor Laboratory Press
  2. Pratt LA Silhavy TJ Hoch JA Silhavy TJ 1995 Porin regulon of Escherichia coli Two-component signal transduction Washington D. C ASM Press 105 127

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Authors
Noriega, C. E., Lin, H., Chen, L., Williams, S. B., & Stewart, V.
Affiliations
  • University of California, Davis (US)
  • University of Utah (US)
Corresponding author
Stewart, Valley
Venue
Molecular Microbiology
Publisher
Wiley
Published
2010-01
Volume
75
Issue
2
Pages
394-412
ISSN
  • 0950-382X (ISSN-L)
  • 1365-2958
OpenAlex
W2171374540
Cited by
108
References
72
Citations by year
2026: 4 · 2025: 9 · 2024: 7 · 2023: 13 · 2022: 10 · 2021: 14 · 2020: 5 · 2019: 6 · 2018: 2 · 2017: 2 · 2016: 7 · 2015: 4 · 2014: 4 · 2013: 4 · 2012: 10
FWCI
3.29
Type
journal article
Language
en
Open access
Locations
  • Molecular Microbiology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • U.S. Public Health Service
  • National Institute of General Medical Sciences (GM036877, R01GM036877)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
Keywords
two-component systems, cross-regulation, dephosphorylation, missense mutants, nitrate signaling, Escherichia coli K-12
MeSH terms
DNA-Binding Proteins, Homeostasis, Kinetics, Membrane Proteins, Phenotype, Phosphoproteins, Phosphorylation, Phosphotransferases, Protein Kinases, Gene Expression Regulation, Bacterial, Amino Acid Substitution, Escherichia coli Proteins, Escherichia coli K12

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