The Relationship between Virginiae Butanolide C(VB-C) and Receptor in Virginiamycin Production

Virginiamycin 생산유도에 관여하는 Virginiae Butanolide C(VB-C) 및 Receptor의 상관관계

Virginiae butanolide C(VB-C) is one of the butyrolactone autoregulators, which triggers the productin of virginiamycin in Streptomyces virginiae. To further understand the mechanism of virginiamycin induction, we isolated three mutants from S. virginiae by N-methyl-N'-nitrosoguanidine (NTG) treatment. The characteristics of the three mutants were confirmed as follows: the mutant No. 1 delayed the production of the VB-C, receptor and antibiotics; the mutant No.3 hyperproduced receptor; the mutant No.4 failed to produce the VB-C. The addition of synthetic VB-C couldn't induce the production of antibiotics in the mutant No.1 due to delayed production of receptor, could provoke the production of larger amount of antibiotics than parental wild type strain in the mutant No.3 due to the presence of large amount of receptor, and could induce production of very small amount of antibiotics in the mutant No.4 due to the absence of VB-C. Antimicrobial spectrum and HPLC analysis of the mutant No.1 and No.3 suggested that the VB-C might have a specific ability to induce the production of virginiamycin M and S. These results imply that the VB-C has an ability to trigger the production of virginiamycin under receptor existence in S. virginiae.