Altering the core RNA polymerase and thereby improving the bacteria adaption

We explored a strategy to optimize the transcriptional regulation in Escherichia coli by engineering core RNA polymerase (RNAP) and sigma factor interactions. As a proof of concept, we focused on mutations in the core RNAP subunits and their effects on global gene expression. Natural and engineered variants were examined for their potential to enhance stress resistance and metabolic efficiency. Our study involved collecting and analyzing various core RNAP mutations to assess their interactions with different sigma factors and their impact on the overall transcriptional profile. Using RNA-seq, we profiled the gene expression changes in E. coli strains harboring these mutations. Differential expression analysis was performed to identify key regulatory pathways and genes affected by the mutations. This approach provides insights into the mechanisms of transcriptional regulation and environmental adaptation in E. coli. The findings could be extended to other global regulatory systems to enhance cellular functions such as stress resistance, carbon metabolism, and biosynthesis, ultimately aiding in the development of robust microbial cell factories (MCFs).