Defining the genetic differences between wild and domestic strains of <i>Bacillus subtilis</i> that affect poly‐γ‐<scp>dl</scp>‐glutamic acid production and biofilm formation

• Nicola R. Stanley

• Beth A. Lazazzera

抄録

Biofilms are communities of microbial cells that are encased in a self‐produced, polymeric matrix and  are  adherent  to  a  surface.  For  several  species of bacteria, an enhanced ability to form biofilms has been linked with an increased capability to produce exopolymers. To identify exopolymers of Bacillus subtilis that can contribute to biofilm formation, we transferred the genetic determinants that control exopolymer production from a wild, exopolymer‐positive strain to a domesticated, exopolymer‐negative strain. Mapping these genetic determinants led to the identification of γ‐poly‐ dl ‐glutamic acid (γ‐PGA) as an exopolymer that increases biofilm formation, possibly through enhancing cell–surface interactions. Production of γ‐PGA by Bacillus subtilis was known to be dependent on the two‐component regulator ComPA; this study highlighted the additional dependence on the DegS‐DegU, DegQ and SwrA regulator proteins. The inability of the domestic strain of B. subtilis to produce γ‐PGA was mapped to two base pairs; a single base pair change in the promoter region of degQ and a single base pair insertion in the coding region of swrA . Introduction of alleles of degQ and swrA from the wild strain into the domestic strain was sufficient to allow γ‐PGA production. In addition to controlling γ‐PGA production, ComPA and DegSU were also shown to activate biofilm formation through an as yet undefined pathway. The identification of these regulators as affecting γ‐PGA production and biofilm formation suggests that these processes are regulated by osmolarity, high cell density and phase variation.

収録刊行物

• Molecular Microbiology

  Molecular Microbiology 57 (4), 1143-1158, 2005-07-05

  Wiley

キーワード

• Molecular Biology
• Microbiology

詳細情報

• CRID: 1363951795355312768
• NII論文ID: 80017784813
• DOI: 10.1111/j.1365-2958.2005.04746.x
• ISSN: 13652958
• ISSN: 0950382X
• ISSN: http://id.crossref.org/issn/0950382X
• Web Site: https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2958.2005.04746.x
• Web Site: https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2958.2005.04746.x
• データソース種別:
  • Crossref
  • CiNii Articles