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Improvement of chloramphenicol production in Streptomyces venezuelae ATCC 10712 by overexpression of the aroB and aroK genes catalysing steps in the shikimate pathway

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Abstract

Streptomyces venezuelae ATCC 10712 produces chloramphenicol in small amounts. To enhance chloramphenicol production, two genes, aroB and aroK, encoding rate-limiting enzymes of the shikimate pathway were overexpressed using the expression vector pIJ86 under the control of the strong constitutive ermE* promoter. The recombinant strains, S. venezuelae/pIJ86-aroB and S. venezuelae/pIJ86-aroK, produced 2.5- and 4.3-fold greater amounts respectively of chloramphenicol than wild type at early stationary phase of growth. High transcriptional levels of aroB and aroK genes were detected at the early exponential growth of both recombinant strains and consistent with the enhanced expression of pabB gene encoding an early enzyme in chloramphenicol biosynthesis. The results suggested that the increment of carbon flux was directed towards intermediates in the shikimate pathway required for the production of chorismic acid, and consequently resulted in the enhancement of chloramphenicol production. This work is the first report of a convenient genetic approach to manipulate primary metabolite genes in S. venezuelae in order to increase chloramphenicol production.

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Acknowledgments

We thank Mervyn Bibb, John Innes Centre, UK for kindly provide S. venezuelae ATCC 10712 and pIJ86. V. Vitayakritsirikul received Ph.D. scholarship from Huachiew Chalermprakiet University, Thailand. This work was supported financially by BIOTEC, NSTDA under the grant number BT-B-01-XG-11-5001 and the Center of Excellence for Innovation in Chemistry (PERCH-CIC). The Office of the Higher Education Commission, Ministry of Education is also gratefully acknowledged.

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Correspondence to Arinthip Thamchaipenet.

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Vitayakritsirikul, V., Jaemsaeng, R., Lohmaneeratana, K. et al. Improvement of chloramphenicol production in Streptomyces venezuelae ATCC 10712 by overexpression of the aroB and aroK genes catalysing steps in the shikimate pathway. Antonie van Leeuwenhoek 109, 379–388 (2016). https://doi.org/10.1007/s10482-015-0640-y

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  • DOI: https://doi.org/10.1007/s10482-015-0640-y

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