Zymomonas mobilis subsp. mobilis low pH mutants RNA-Seq
In this study, adaptive laboratory evolution (ALE) strategy was applied to adapt Z. mobilis under acidic pH condition. Two mutant strains named 3.6M and 3.5M with enhanced acidic-pH tolerance were selected and confirmed. Mutant strains 3.6M and 3.5M exhibited 50~130% enhancement on growth rate, 4~9 h reduction on fermentation time, and 20~63% improvement on ethanol productivity than wild-type ZM4 at pH 3.8. Next-generation sequencing (NGS)-based whole-genome resequencing (WGR) and RNA-Seq technologies were applied to unravel the acidic pH tolerance mechanism of mutant strains.