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Differential expression of secretion machinery during bacterial growth: SecY and SecF decrease while SecA increases

Chun-Kai Yang1, Chung-Dar Lu, Phang C Tai

  • 1Department of Biology, Center of Biotechnology and Drug Design, Georgia State University, 592 PSC, 161 Jesse Hill Jr. Road, Atlanta, GA, 30303, USA.

Current Microbiology
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

Protein secretion machinery genes show altered expression during bacterial growth phases. SecA protein levels increase in stationary phase, suggesting specific roles in this environment for Bacillus subtilis and Escherichia coli.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • House-keeping genes, including secY, decrease transcription from exponential to stationary phase in Bacillus subtilis.
  • Contradictory to previous findings, other sec genes, like secA, show enhanced transcription.
  • SecA is an essential ATPase crucial for protein secretion.

Purpose of the Study:

  • To investigate the differential expression of sec genes and proteins during bacterial growth transitions.
  • To understand the physiological implications of altered Sec protein levels in the stationary phase.

Main Methods:

  • Analysis of gene transcription during exponential and stationary phases.
  • Protein level quantification using immunoblotting.
  • Comparison of protein ratios (SecA/SecY, SecA/SecF) between growth phases.

Main Results:

  • Transcription of secY and other sec genes decreased, while secA transcription increased in B. subtilis stationary phase.
  • SecA protein levels significantly increased in B. subtilis stationary phase.
  • Escherichia coli showed decreased SecY and SecF, and increased SecA during stationary phase, leading to higher SecA/SecY and SecA/SecF ratios.

Conclusions:

  • Differential expression of Sec proteins occurs during the transition to the stationary phase.
  • Increased SecA levels and SecA/Sec ratios suggest specialized functions of the protein secretion machinery in the stationary phase.