Functional investigation of AfsKRS regulatory system for pristinamycin biosynthesis in .

Three genes encoding AfsK, AfsR, AfsS homologues in were studied, respectively, to investigate regulatory role of AfsKRS system for pristinamycin biosynthesis. Transcription change and gene inactivation analysis indicated that these genes had active transcription and positive regulation for the improvement of pristinamycin production in . The analysis of AfsKRS-defective mutagenesis indicated that there might be a positive correlation between the product of and pristinamycin I biosynthesis, and a negative correlation to pristinamycin II biosynthesis.