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Bacterial Phylum Proteobacteria01:26

Bacterial Phylum Proteobacteria

Proteobacteria, one of the largest and most diverse bacterial phyla, encompasses a wide range of Gram-negative bacteria distinguished by their outer membrane composed of lipopolysaccharides. These microorganisms exhibit various metabolic capabilities, including phototrophy, chemolithotrophy, and heterotrophy, and thrive in diverse environments from soil to aquatic systems and host-associated niches. The phylum is divided into six classes: Alphaproteobacteria, Betaproteobacteria,...
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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These structures enable bacteria to thrive under fluctuating environmental conditions by storing essential resources and optimizing their metabolic efficiency.Carbon Storage: Poly-β-Hydroxybutyric Acid and Glycogen GranulesBacteria frequently store excess carbon in specialized granules. Poly-β-hydroxybutyric acid (PHB) granules are lipid polymers that...
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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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Assaying for Inorganic Polyphosphate in Bacteria
07:20

Assaying for Inorganic Polyphosphate in Bacteria

Published on: January 21, 2019

New structural and functional defects in polyphosphate deficient bacteria: a cellular and proteomic study.

Cristian Varela1, Cecilia Mauriaca, Alberto Paradela

  • 1Department of Biology, Faculty of Sciences, Laboratory of Molecular Microbiology and Biotechnology & Millennium Institute of Cell Dynamics and Biotechnology, University of Chile, Las Palmeras 3425, Nuñoa, Santiago, Chile.

BMC Microbiology
|January 14, 2010
PubMed
Summary

Bacterial polyphosphate (polyP) deficiency impacts cell structure and function, affecting energy metabolism and triggering stress responses. Understanding these changes reveals how cells adapt to polyP loss.

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Area of Science:

  • Microbiology
  • Biochemistry

Background:

  • Inorganic polyphosphate (polyP) is vital for bacterial cell functions, including motility and virulence.
  • PolyP is synthesized by polyphosphate kinases (PPK1, PPK2) and degraded by exopolyphosphatase (PPX).
  • PolyP deficiency due to ppk1 gene knockout causes pleiotropic effects, not fully understood.

Purpose of the Study:

  • Investigate the pleiotropic effects of polyP deficiency in Pseudomonas sp. B4.
  • Elucidate cellular adjustments during polyP deficiency using comparative proteomics.

Main Methods:

  • Overexpression of exopolyphosphatase (PPX) to mimic polyP deficiency.
  • Comparative proteomics to analyze cellular changes.

Main Results:

  • PPX overexpression induced defects similar to ppk1 mutants, including altered colony morphology, lipopolysaccharide (LPS) structure, and cell division.
  • Proteomic analysis revealed metabolic shifts in response to polyP deficiency.

Conclusions:

  • PolyP deficiency affects energy metabolism, particularly nucleoside triphosphate (NTP) formation.
  • Bacterial cells compensate by enhancing energy-generating pathways (TCA cycle, beta-oxidation, oxidative phosphorylation) and reducing energy consumption.
  • A general stress response is activated during polyP deficiency.