Actinorhodin (ACT) and Doxorubicin (DOX) belong to a structural family of type II polyketide compounds generated by a high G+C Gram-positive soil bacterium, Streptomyces species. Here we report the identification of a couple of previously-unknown down-regulator genes via comparative transcriptome profiles using S. coelicolor cDNA microarrays. Using interspecies DNA microarray analysis, we found several putative transcriptional down-regulator genes involved in antibiotic biosynthesis. To show the biological significance of the transcriptomics-driven potential down-regulator genes in Streptomyces species, these genes were functionally expressed both in ACT-producing S. coelicolor and DOX-producing S. peucetius. Further analysis revealed that the expression of these putative transcriptional down-regulators inhibited both actinorhodin and undecylprodigiosin production in S. coelicolor. Overexpression of these genes also inhibited the biosynthesis of DOX in S. peucetius. Real-time RT-PCR confirmed that the differences of antibiotic productivity in S. coelicolor were due to the differential expression levels of antibiotic pathway-specific regulatory genes including actII-orf4 and redD/Z. Therefore, we concluded that the interspecies DNA microarray analysis reported here successfully identified a couple of novel global down-regulators of antibiotic biosynthesis in Streptomyces species.
저자
Han-Na Lee [ Department of Biological Engineering, Inha University ]
Jong-Hyuk Im [ Department of Biological Engineering, Inha University ]
Eung-Soo Kim [ Department of Biological Engineering, Inha University ]
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
이 법인은 생물 공학의 발전과 보급에 이바지하고, 회원 상호 간의 연구 협력과 친목을 도모함을 목적으로 한다
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