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Functional Expression of Proteomics-guided AfsR2-dependent Genes in Avermectin-producing Streptomyces avermitilis  

Kim Myung-Gun (Department of Biological Engineering, Inha University)
Park Hyun-Joo (Department of Biological Engineering, Inha University)
Im Jong-Hyuk (Department of Biological Engineering, Inha University)
Kim Eung-Soo (Department of Biological Engineering, Inha University)
Publication Information
Microbiology and Biotechnology Letters / v.34, no.3, 2006 , pp. 211-215 More about this Journal
Abstract
AfsR2 is a global regulatory protein involved in the stimulation of secondary metabolite biosynthesis in various Streptomyces species including avermectin-producing S. avermitilis. Among several AfsR2-dependent genes identified from the comparative proteomics, the polyribonucleotide nucleotidyltransferase (PNP) and the glyceraldehyde-3-phosphate dehydrogenase (GPD) genes were previously proposed to regulate the actinorhodin production in S. lividans upon afsR2 over-expression positively and negatively, respectively. To show the biological significance of the PNP and GPD genes in the S. avermitilis strains, these two genes were functionally expressed in both the wild-type and the avermectin-overproducing mutant strains. The PNP gene expression stimulated secondary metabolite production in the wild-type S. avermitilis ATCC31267, but not in the avermectin-overproducing S. avermitilis ATCC31780. Interestingly, the GDP gene expression stimulated secondary metabolite production by 4-fold in the wild-type S. avermitilis ATCC31267 and by 2.5-fold in the avermectin-overproducing S. avermitilis ATCC31780, respectively. These results suggest that the biological significance of the afsR2-dependent PNP and GPD gene expressions on antibiotic biosynthetic regulation could be significantly different depending on Streptomyces species.
Keywords
AfsR2-dependent genes; avermectin; Streptomyces;
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