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

Abstract

AbstractBackgroundCorynebacterium ammoniagenesis an important industrial organism that is widely used to produce nucleotides and the potential for industrial production of coenzyme A byC. ammoniagenesATCC 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.ResultsIn 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 (Prpl21) exhibited the strongest activity among the 26 identified promoters. Furthermore, type III pantothenate kinase fromPseudomonas putida(PpcoaA) was overexpressed inC. ammoniagenesunder the control of Prpl21, CoA yield increased approximately 4.4 times.ConclusionsThis 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 forC. ammoniagenesand 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 inC. ammoniagenesATCC 6871 for industrial applications.