Activation of extracytoplasmic function sigma factors upon removal of glucolipids and reduction of phosphatidylglycerol content in Bacillus subtilis cells lacking lipoteichoic acid

Takahiro Seki, Takuya Furumi, Michihiro Hashimoto, Hiroshi Hara, Satoshi Matsuoka*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

In Bacillus subtilis, extracytoplasmic function (ECF) sigma factors are activated by reduction of phosphatidylglycerol (PG) content, absence of glucolipids, or absence of lipoteichoic acid (LTA). LTA is synthesized by polymerization of the glycerophosphate moiety of PG onto diglucosyldiacylglycerol (DGlcDG), a major glucolipid in B. subtilis, in the plasma membrane. Thus, reduction of PG content or absence of glucolipids might cause some changes in LTA, and hence we investigated whether reduction of PG content or absence of glucolipids induces the activation of ECF sigma factors independently from an ensuing change in LTA. Disruption of ugtP, responsible for glucolipid synthesis, in cells lacking LTA caused an additive increase of activation levels of σM, σX, σV and σY (3.1-, 2.2-, 2.1- and 1.4-fold, respectively), relative to their activation levels in cells lacking LTA alone. Reduction of PG content (by repressing Pspac-pgsA) in the cells lacking LTA caused an additive increase of activation levels of σM, σW and σV (2.3-, 1.9- and 2.2-fold, respectively). These results suggested that absence of glucolipids or reduction of PG alone, not the possible secondary alteration in LTA, leads to changes that affect the regulation systems of some ECF sigma factors in the plasma membrane.

Original languageEnglish
Pages (from-to)71-80
Number of pages10
JournalGenes and Genetic Systems
Volume94
Issue number2
DOIs
Publication statusPublished - 2019
Externally publishedYes

Keywords

  • ECF sigma factor
  • Glucolipids
  • Lipid composition
  • Lipoteichoic acid
  • Phosphatidylglycerol

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics

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