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Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores
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Bacillus subtilis Spore Inner Membrane Proteome.

Linli Zheng, Wishwas Abhyankar, Natasja Ouwerling

  • 1Electron Microscopy Centre Amsterdam, Department of Cell Biology and Histology, Academic Medical Center , 1105 AZ Amsterdam, The Netherlands.

Journal of Proteome Research
|January 6, 2016
PubMed
Summary

Researchers identified over 900 proteins in the Bacillus subtilis spore inner membrane (IM), revealing new proteins involved in bacterial spore germination and potential targets for germination inhibition.

Keywords:
Bacillus subtilismass spectrometryproteomespore inner membrane

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Area of Science:

  • Microbiology
  • Proteomics
  • Cell Biology

Background:

  • Bacterial endospores, the dormant form of Bacillus subtilis and other Firmicutes, enable survival in harsh conditions through sporulation.
  • Spore germination is essential for returning to the vegetative growing state.
  • The spore inner membrane (IM) is critical for initiating germination.

Purpose of the Study:

  • To isolate and proteomically characterize the inner membrane (IM) of Bacillus subtilis spores.
  • To compare the proteome of spore IM with that of vegetative cell membranes.
  • To identify novel proteins involved in spore germination and potential targets for inhibition.

Main Methods:

  • Isolation of bacterial spore inner membrane (IM) and vegetative cell membranes.
  • Proteomic analysis using Gel-Liquid Extraction with tandem Mass Spectrometry (GeLC-MS/MS).
  • Bioinformatic prediction of membrane-localized proteins.

Main Results:

  • Over 900 proteins were identified in the Bacillus subtilis spore IM preparations.
  • Approximately one-third of identified proteins were predicted to be membrane-localized.
  • A significant number of unique and common proteins were found between spore IM and vegetative cell membranes, including newly identified IM proteins.

Conclusions:

  • The study provides a comprehensive proteomic dataset of the Bacillus subtilis spore IM.
  • Newly identified IM proteins offer potential insights into IM physiology and spore germination.
  • These findings highlight potential targets for inhibiting bacterial spore germination.