Adaptive laboratory evolution of Escherichia coli under acid stress.
Microbiology (Reading)
; 166(2): 141-148, 2020 02.
Article
in En
| MEDLINE
| ID: mdl-31625833
ABSTRACT
The ability of Escherichia coli to tolerate acid stress is important for its survival and colonization in the human digestive tract. Here, we performed adaptive laboratory evolution of the laboratory strain E. coli K-12 MG1655 at pH 5.5 in glucose minimal medium. After 800 generations, six independent populations under evolution had reached 18.0â% higher growth rates than their starting strain at pH 5.5, while maintaining comparable growth rates to the starting strain at pH 7. We characterized the evolved strains and found that (1) whole genome sequencing of isolated clones from each evolved population revealed mutations in rpoC appearing in five of six sequenced clones; and (2) gene expression profiles revealed different strategies to mitigate acid stress, which are related to amino acid metabolism and energy production and conversion. Thus, a combination of adaptive laboratory evolution, genome resequencing and expression profiling revealed, on a genome scale, the strategies that E. coli uses to mitigate acid stress.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Acids
/
Adaptation, Physiological
/
Escherichia coli
Language:
En
Journal:
Microbiology (Reading)
Journal subject:
MICROBIOLOGIA
Year:
2020
Document type:
Article
Affiliation country:
Estados Unidos