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The biosynthesis of the enterobacterial common antigen and flagella in Escherichia coli consumes lots of substrates and energy. In this study, 12 genes responsible for the biosynthesis of the enterobacterial common antigen were deleted in E. coli MG1655, resulting in WQM021. WQM021 grew better than MG1655 in both rich LB medium and minimum M9 medium. Compared with MG1655, WQM021 showed higher membrane permeability and higher production efficiency for recombinant proteins, polyhydroxyalkanoate, and l-threonine. Transcriptome analysis rev