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Biologija / Biology

ISSN 1392-0146
ISSN 2029-0578 (online)

2005 m. Nr. 1

Acid adaptation of Escherichia coli: a genetic study
V. Šeputienė, K. Sužiedėlis, E. Sužiedėlienė

E. coli log-phase cells are capable of inducing of log-phase acid tolerance response (ATR), but stationary-phase cells do not exhibit this adaptive ability. To study the genetic systems responsible for the induction of log-phase ATR, we investigated E. coli mutants deficient in the known acid resistance systems. Our results show that RpoS-dependent oxidative and arginine decarboxylase systems are not induced during acid adaptation of log-phase cells. Glutamate decarboxylases were found to be induced during adaptation and result in a more efficient acid-protection. However, our study shows that other highly efficient protection mechanisms are induced, operate and play the main role in log-phase ATR.

Keywords: E. coli acid tolerance response (ATR), acid resistance systems (AR), RpoS-dependent oxidative system, glutamate and arginine decarboxylase systems

Issues:

2011 - Vol.57
No. 1, No. 2, No. 3

2010 - Vol.56
No. 1-4

2009 - Vol.55
No. 1-2, No. 3-4

2008 - Vol.54
No. 1, No. 2, No. 3, No. 4

2007 - Vol.53
No. 1, No. 2, No. 3, No. 4

2006
No. 1, No. 2, No. 3, No. 4

2005
No. 1, No. 2, No. 3, No. 4

2004
No. 1, No. 2, No. 3, No. 4

2003
No. 1, No. 2, No. 3, No. 4

2002
No. 1, No. 2, No. 3, No. 4

2001
No. 1, No. 2, No. 3, No. 4