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Application of a combined approach involving classical random mutagenesis and metabolic engineering to enhance FK506 production in Streptomyces sp. RM7011

  • Applied genetics and molecular biotechnology
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Abstract

FK506 production by a mutant strain (Streptomyces sp. RM7011) induced by N-methyl-N′-nitro-N-nitrosoguanidine and ultraviolet mutagenesis was improved by 11.63-fold (94.24 mg/l) compared to that of the wild-type strain. Among three different metabolic pathways involved in the biosynthesis of methylmalonyl-CoA, only expression of propionyl-CoA carboxylase (PCC) pathway led to a 1.75-fold and 2.5-fold increase in FK506 production and the methylmalonyl-CoA pool, respectively, compared to those of the RM7011 strain. Lipase activity of the high FK506 producer mutant increased in direct proportion to the increase in FK506 yield, from low detection level up to 43.1 U/ml (12.6-fold). The level of specific FK506 production and lipase activity was improved by enhancing the supply of lipase inducers. This improvement was approximately 1.88-fold (71.5 mg/g) with the supplementation of 5 mM Tween 80, which is the probable effective stimulator in lipase production, to the R2YE medium. When 5 mM vinyl propionate was added as a precursor for PCC pathway to R2YE medium, the specific production of FK506 increased approximately 1.9-fold (71.61 mg/g) compared to that under the non-supplemented condition. Moreover, in the presence of 5 mM Tween 80, the specific FK506 production was approximately 2.2-fold (157.44 mg/g) higher than that when only vinyl propionate was added to the R2YE medium. In particular, PCC expression in Streptomyces sp. RM7011 (RM7011/pSJ1003) together with vinyl propionate feeding resulted in an increase in the FK506 titer to as much as 1.6-fold (251.9 mg/g) compared with that in RM7011/pSE34 in R2YE medium with 5 mM Tween 80 supplementation, indicating that the vinyl propionate is more catabolized to propionate by stimulated lipase activity on Tween 80, that propionyl-CoA yielded from propionate generates methylmalonyl-CoA, and that the PCC pathway plays a key role in increasing the methylmalonyl-CoA pool for FK506 biosynthesis in RM7011 strain. Overall, these results show that a combined approach involving classical random mutation and metabolic engineering can be applied to supply the limiting factor for FK506 biosynthesis, and vinyl propionate could be successfully used as a precursor of important methylmalonyl-CoA building blocks.

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Acknowledgement

This work was supported by a grant from the Next-Generation BioGreen 21 Program (No. PJ008093 and PJ008333), Rural Development Administration, Republic of Korea.

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Authors and Affiliations

  1. Division of Bioscience and Bioinformatics, Myongji University, Youngin, 449-7282, South Korea

    SangJoon Mo, Sung-Kwon Lee, Ying-Yu Jin & Joo-Won Suh

  2. Department of Oral Physiology, College of Dentistry, Dankook University, Cheonan, 330-714, South Korea

    Chung-Hun Oh

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  1. SangJoon Mo
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Correspondence to Joo-Won Suh.

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SangJoon Mo and Sung-Kwon Lee contributed equally to the work.

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Mo, S., Lee, SK., Jin, YY. et al. Application of a combined approach involving classical random mutagenesis and metabolic engineering to enhance FK506 production in Streptomyces sp. RM7011. Appl Microbiol Biotechnol 97, 3053–3062 (2013). https://doi.org/10.1007/s00253-012-4413-5

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