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Related Experiment Videos

Bacillus subtilis spore coat.

A Driks1

  • 1Department of Microbiology and Immunology, Loyola University Medical Center, Maywood, Illinois 60153, USA.adriks@luc.edu

Microbiology and Molecular Biology Reviews : MMBR
|March 6, 1999
PubMed
Summary

Bacterial spores develop a protective protein coat essential for survival. This review details how specific proteins assemble this complex coat, revealing new insights into spore morphogenesis.

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Molecular microbiology·2001

Area of Science:

  • Microbiology
  • Cell Biology
  • Developmental Biology

Background:

  • Bacilli and clostridia form highly resistant spores during starvation.
  • The spore coat, a proteinaceous shell, is crucial for survival and comprises over 25 polypeptide species organized into distinct layers.
  • Mechanisms governing spore coat assembly were previously poorly understood.

Purpose of the Study:

  • To review the contributions of known coat and morphogenetic proteins to spore coat assembly and function.
  • To present a model for how morphogenetic proteins direct coat assembly to the spore surface and establish its layers.
  • To discuss the role of posttranslational protein processing in coat morphogenesis.

Main Methods:

  • Review of cloned structural and morphogenetic genes (over 20 identified).
  • Analysis of protein functions in spore coat assembly.
  • Examination of posttranslational modifications of coat proteins.

Main Results:

  • Proper spore coat formation depends on genetic programs and dedicated morphogenetic proteins.
  • Morphogenetic proteins are key to directing coat assembly to the correct subcellular location and establishing distinct layers.
  • Posttranslational processing significantly influences coat protein morphogenesis.

Conclusions:

  • A model is proposed for the directed assembly of the spore coat layers by morphogenetic proteins.
  • Understanding these mechanisms enhances knowledge of bacterial spore resistance and survival strategies.
  • Outstanding questions in spore coat assembly and function remain for future research.

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