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• W2018169707 abstract "FK506 is an important 23-member polyketide macrolide with immunosuppressant activity. Its entire biosynthetic gene cluster was previously cloned from Streptomyces sp. strain KCTC 11604BP, and sequence analysis identified three putative regulatory genes, tcs2, tcs7, and fkbN, which encode proteins with high similarity to the AsnC family transcriptional regulators, LysR-type transcriptional regulators, and LAL family transcriptional regulators, respectively. Overexpression and in-frame deletion of tcs2 did not affect the production of FK506 or co-occurring FK520 compared to results for the wild-type strain, suggesting that tcs2 is not involved in their biosynthesis. fkbN overexpression improved the levels of FK506 and FK520 production by approximately 2.0-fold, and a deletion of fkbN caused the complete loss of FK506 and FK520 production. Although the overexpression of tcs7 decreased the levels of FK506 and FK520 production slightly, a deletion of tcs7 caused 1.9-fold and 1.5-fold increases in FK506 and FK520 production, respectively. Finally, fkbN overexpression in the tcs7 deletion strain resulted in a 4.0-fold (21 mg liter(-1)) increase in FK506 production compared to that by the wild-type strain. This suggests that fkbN encodes a positive regulatory protein essential for FK506/FK520 biosynthesis and that the gene product of tcs7 negatively regulates their biosynthesis, demonstrating the potential of exploiting this information for strain improvement. Semiquantitative reverse transcription-PCR (RT-PCR) analyses of the transcription levels of the FK506 biosynthetic genes in the wild-type and mutant strains proved that most of the FK506 biosynthetic genes are regulated by fkbN in a positive manner and negatively by tcs7." @default.
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• W2018169707 date "2012-04-01" @default.
• W2018169707 modified "2023-09-28" @default.
• W2018169707 title "Roles of <i>fkbN</i> in Positive Regulation and <i>tcs7</i> in Negative Regulation of FK506 Biosynthesis in Streptomyces sp. Strain KCTC 11604BP" @default.
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• W2018169707 doi "https://doi.org/10.1128/aem.06766-11" @default.
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