Differences in cold adaptation of .i.Bacillus subtilis./i. under anaerobic and aerobic conditions

0349691 - BC 2011 RIV US eng J - Journal Article
Beranová, J. - Mansilla, M.C. - de Mendoza, D. - Elhottová, Dana - Konopásek, I.
Differences in cold adaptation of Bacillus subtilis under anaerobic and aerobic conditions.
Journal of Bacteriology. Roč. 192, č. 16 (2010), s. 4164-4171. ISSN 0021-9193. E-ISSN 1098-5530
R&D Projects: GA MŠMT LC06066
Institutional research plan: CEZ:AV0Z60660521
Keywords : cold adaptation * Bacillus subtilis * anaerobiosis
Subject RIV: EE - Microbiology, Virology
Impact factor: 3.726, year: 2010

Bacillus subtilis, which grows under aerobic conditions, employs fatty acid desaturase (Des) to fluidize its membrane when subjected to temperature downshift. Des requires molecular oxygen for its activity, and its expression is regulated by DesK-DesR, a two-component system. Transcription of des is induced by the temperature downshift and is decreased when membrane fluidity is restored. B. subtilis is also capable of anaerobic growth by nitrate or nitrite respiration. We studied the mechanism of cold adaptation in B. subtilis under anaerobic conditions that were predicted to inhibit Des activity. We found that in anaerobiosis, in contrast to aerobic growth, the induction of des expression after temperature downshift (from 37°C to 25°C) was not downregulated. However, the transfer from anaerobic to aerobic conditions rapidly restored the downregulation. However, the transfer from anaerobic to aerobic conditions rapidly restored the downregulation.
Permanent Link: http://hdl.handle.net/11104/0189855