Publication Date:
2016-05-20
Description:
Three putative regulatory genes, namely ttmRI, ttmRII and ttmRIII , which are present in the tetramycin ( ttm ) biosynthetic gene cluster, were found in Streptomyces ahygroscopicus . Disruption of ttmRI, ttmRII or ttmRIII reduced tetramycin production, and their complementation restored production to varying degrees. Gene expression analysis of the wild-type (WT) and mutant strains through reverse transcriptase–polymerase chain reaction (RT-PCR) of the ttm gene cluster showed that the expression levels of most of the biosynthetic genes were reduced in ttmRI , ttmRII and ttmRIII . Electrophoretic mobility shift assays demonstrated that TtmRI, TtmRII and TtmRIII bound the promoters of several genes in the ttm gene cluster. This study found that these three proteins are a group of positive regulators that activate the transcription of the ttm gene cluster in S. ahygroscopicus . In addition, ttmRII had a reduced degree of grey pigmentation. Thus, TtmRII has a pleiotropic regulatory function in the tetramycin biosynthetic pathway and in development.
Keywords:
Physiology & Biochemistry
Print ISSN:
0378-1097
Electronic ISSN:
1574-6968
Topics:
Biology
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