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Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
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Related Experiment Video

Updated: Jul 9, 2025

Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
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Small proteins in Gram-positive bacteria.

Sabine Brantl1, Inam Ul Haq1

  • 1AG Bakteriengenetik, Matthias-Schleiden-Institut, Friedrich-Schiller-Universität Jena, Philosophenweg 12, Jena D-07743, Germany.

FEMS Microbiology Reviews
|December 5, 2023
PubMed
Summary
This summary is machine-generated.

Small bacterial proteins, often overlooked, play crucial roles in cellular processes. This review highlights their functions in Gram-positive bacteria, particularly Bacillus subtilis, and methods for their study.

Keywords:
Bacillus subtilisRNA chaperonesRNA degradosomeSR1PSR7Psmall proteinsporulationtoxins of type I toxin–antitoxin systems

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Small proteins (<100 amino acids) are frequently missed in bacterial genome annotations.
  • Recent peptidome studies have revealed numerous small proteins, but few are well-characterized.
  • These proteins can be membrane-associated or cytosolic, interacting with various cellular components.

Purpose of the Study:

  • To review current knowledge on small proteins in Gram-positive bacteria.
  • To emphasize the model organism Bacillus subtilis for small protein research.
  • To present methodologies for identifying and studying small proteins.

Main Methods:

  • Literature review of small protein research.
  • Focus on studies involving Gram-positive bacteria and Bacillus subtilis.
  • Discussion of identification and characterization techniques.

Main Results:

  • Small proteins have diverse functions, including roles in type I toxin-antitoxin systems.
  • Examples include proteins regulating sporulation, higher-order structure assembly, and RNA metabolism.
  • The study excludes antimicrobial peptides from its scope.

Conclusions:

  • Small proteins are vital components of bacterial cellular machinery.
  • Further research is needed to fully understand their roles and functions.
  • Standardized methods are essential for comprehensive small protein discovery and characterization.