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Background   Corynebacterium ammoniagenes  is an important industrial organism that is widely used to produce nucleotides and the potential for industrial production of coenzyme A by  C. ammoniagenes  ATCC 6871 has been shown. However, the yield of coenzyme A needs to be improved, and the available constitutive promoters are rather limited in this strain.    Results  In this study, 20 putative DNA promoters derived from genes with high transcription levels and 6 promoters from molecular chaperone genes were identified. To evaluate the activity of each promoter, red fluorescence protein (RFP) was used as a reporter. We successfully isolated a range of promoters with different activity levels, and among these a fragment derived from the upstream sequence of the 50S ribosomal protein L21 (P  rpl21  ) exhibited the strongest activity among the 26 identified promoters. Furthermore, type III pantothenate kinase from  Pseudomonas putida  ( Pp coaA) was overexpressed in  C. ammoniagenes  under the control of P  rpl21  , CoA yield increased approximately 4.4 times.    Conclusions  This study provides a paradigm for rational isolation of promoters with different activities and their application in metabolic engineering. These promoters will enrich the available promoter toolkit for  C. ammoniagenes  and should be valuable in current platforms for metabolic engineering and synthetic biology for the optimization of pathways to extend the product spectrum or improve the productivity in  C. ammoniagenes  ATCC 6871 for industrial applications.

Isolating promoters from Corynebacterium ammoniagenes ATCC 6871 and application in CoA synthesis