Abstracts - faqs.org

Abstracts

Biological sciences

Search abstracts:
Abstracts » Biological sciences

Aspartate transport by the Dct system in Rhizobium leguminosarum negatively affects nitrogen-regulated operons

Article Abstract:

Amino acid uptake by the general amino acid permease (Aap) of Rhizobium leguminosarum strain 3841 was greatly reduced by the presence of aspartate in the growth medium when glucose was the carbon source. This was due to the prevention of uptake and not by transcriptional repression. However, the Ntr-regulated gene glnII was repressed by aspartate. The negative regulatory effect on both the Aap and glnII was prevented by mutation of any component of the dicarboxylate transport system or by the inclusion of a C4-dicarboxylate in the growth medium, including the non-metabolizable analogue 2-methylsuccinate.

Author: Reid, Colm J., Walshaw, David L., Poole, Philip S.
Publisher: Society for General Microbiology
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1996
Amino acids, Aspartate

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Metabolism is required for chemotaxis to sugars in Rhodobacter sphaeroides

Article Abstract:

A comparative analysis was made between the MCP-independent systems in enteric bacteria and the chemotactic systems in Rhodobacter sphaeroides. In this study, chemotaxis was mediated through transport and phosphorylation via phosphoenolpyruvate-dependent phosphotransferase system or through chemotaxis pathway. Results show that chemotactic signal in R. sphaeroides will most likely be created through activities of the electron-transport chain or metabolic intermediates.

Author: Armitage, Judith P., Poole, Philip S., Jeziore-Sassoon, Yehudit, Hamblin, Paul A., Bootle-Wilbraham, Carolyn A.
Publisher: Society for General Microbiology
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1998
Genetic aspects, Bacterial genetics, Chemotaxis, Bacteria, Photosynthetic, Photosynthetic bacteria

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Regulation of the TCA cycle and the general amino acid permease by overflow metabolism in Rhizobium leguminosarum

Article Abstract:

The regulation of the uptake activity of the amino acid permease (Aap) in Rhizobium leguminosarum by the TCA cycle via the synthesis of the amino acids was demonstrated. The 2-oxoglutarate dehydrogenase was found to be the main enzyme. Results reveal that the TCA cycle in R. leguminosorum is regulated by the amino acid excretion and polyhydroxybutyrate biosynthesis which act as overflow pathways for excess carbon and reductant.

Author: Wilkinson, Adam, Smith, Mary, Walshaw, David L., Poole, Philip S., Mundy, Mathius
Publisher: Society for General Microbiology
Publication Name: Microbiology
Subject: Biological sciences
ISSN: 1350-0872
Year: 1997
Rhizobium, Dehydrogenases, Oxidoreductases

User Contributions:

Comment about this article or add new information about this topic:

CAPTCHA


Subjects list: Research
Similar abstracts:
  • Abstracts: A phosphatase controls the fate of receptor-regulated Smads. Phy tunes: Phosphorylation status and phytochrome-mediated signaling
  • Abstracts: Signal transduction via the multi-step phosphorelay: not necessarily a road less traveled. His-Asp phosphorelay: two components or more?
  • Abstracts: The O polysaccharide chain of the lipopolysaccharide from Vibrio cholerae 076 is a homopolymer of N-[(S)-(+)-2-hydroxypropionyl]-alpha-L-perosamine
  • Abstracts: Strain typing with IS200 fingerprints in Salmonella abortusovis. Cost-effective application of pulsed-field gel electrophoresis to typing of Salmonella enterica serovar Typhimurium
  • Abstracts: Akt phosphorylation of BAD couples survival signals to the cell-intrinsic death machinery. The product of par-4, a gene induced during apoptosis, interacts selectively with the atypical isoforms of protein kinase C
This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.
Some parts © 2025 Advameg, Inc.