Interposon mutagenesis of a region upstream of the petABC(fbcFBC) operon, encoding the ubiquinol: cytochrome c2 oxidoreductase (bc1 complex) of the photosynthetic bacterium Rhodobacter capsulatus revealed the presence of two genes, petP and petR. DNA nucleotide sequence determination of this region indicated that petP and petR are transcribed in the same direction as the petABC(fbcFBC) operon, and are translationally coupled. A silent insertion located in the interoperonal region separating petPR and the petABC(fbcFBC) genes indicated that these clusters have separate promoters. The deduced amino acid sequence of the putative petR gene product is homologous to various bacterial response regulators, especially to those of the OmpR subgroup. Moreover, it was found that PetR mutants are unable to grow on rich or minimal media by either photosynthesis or respiration, demonstrating that these gene products are essential for growth of R. capsulatus.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/j.1365-2958.1992.tb00889.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Identification and functional characterization of a fructose-inducible phosphotransferase system in Sp7.
Appl Environ Microbiol
January 2025
School of Biotechnology, Institute of Science, Banaras Hindu University, Varanasi, India.
Plant growth-promoting rhizobacterium Sp7 utilizes fructose efficiently via a fructose phosphotransferase system (Fru-PTS). Its genome encodes two putative Fru-PTS, each consisting of FruB (EIIA), FruK (Pfk), and FruA (EIIBC) proteins. We compared the proteomes of Sp7 grown with malate or fructose as sole carbon source, and noticed upregulation of the constituent proteins of Fru-PTS1 only on fructose.
View Article and Find Full Text PDFLysR-Type Transcriptional Regulator VirR Responds to Temperature and pH and Directly Activates the Transcription of -Containing Operon in .
Int J Microbiol
January 2025
Laboratory of Animal Hygiene, School of Veterinary Medicine, Kitasato University, Higashi 23-35-1, Towada Aomori 034-8628, Japan.
-a facultative intracellular pathogen of macrophages-causes bronchopneumonia in foals and patients who are immunocompromised. Virulent strains of possess a virulence-associated plasmid, which encodes a 15- to 17-kDa surface protein called virulence-associated protein A (VapA). VapA expression is regulated by temperature and pH.
View Article and Find Full Text PDFA leucine responsive small RNA AbcR200 regulates expression of the lactate utilization (lut) operon in Acinetobacter baumannii DS002.
J Biol Chem
January 2025
Dept of Animal Biology, School of Life Sciences, University of Hyderabad, Hyderabad 500 046, India. Electronic address:
Noncoding small RNAs are essential for modulating bacterial gene expression, especially under carbon and nutrient-limited conditions. In this study, by employing both in silico and molecular hybridization tools, we identified a carbon source responsive small RNA in A. baumannii DS002.
View Article and Find Full Text PDFEngineered Mycobacterium tuberculosis triple-kill-switch strain provides controlled tuberculosis infection in animal models.
Nat Microbiol
January 2025
Department of Microbiology and Immunology, Weill Cornell Medical College, New York, NY, USA.
Human challenge experiments could accelerate tuberculosis vaccine development. This requires a safe Mycobacterium tuberculosis (Mtb) strain that can both replicate in the host and be reliably cleared. Here we genetically engineered Mtb strains encoding up to three kill switches: two mycobacteriophage lysin operons negatively regulated by tetracycline and a degron domain-NadE fusion, which induces ClpC1-dependent degradation of the essential enzyme NadE, negatively regulated by trimethoprim.
View Article and Find Full Text PDFA Helicobacter pylori flagellar motor accessory is needed to maintain the barrier function of the outer membrane during flagellar rotation.
PLoS Pathog
January 2025
Department of Microbiology, University of Georgia, Athens, Georgia, United States of America.
The Helicobacter pylori flagellar motor contains several accessory structures that are not found in the archetypal Escherichia coli and Salmonella enterica motors. H. pylori hp0838 encodes a previously uncharacterized lipoprotein and is in an operon with flgP, which encodes a motor accessory protein.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!