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Nakamura K, Nagaki K, Matsutani M, Adachi O, Kataoka N, Ano Y, Theeragool G, Matsushita K, Yakushi T. Relocation of dehydroquinate dehydratase to the periplasmic space improves dehydroshikimate production with Gluconobacter oxydans strain NBRC3244. Appl Microbiol Biotechnol 2021; 105:5883-5894. [PMID: 34390353 DOI: 10.1007/s00253-021-11476-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 07/22/2021] [Accepted: 07/23/2021] [Indexed: 10/20/2022]
Abstract
3-Dehydroshikimate (3-DHS) is a key intermediate for the synthesis of various compounds, including the antiviral drug oseltamivir. The Gluconobacter oxydans strain NBRC3244 intrinsically oxidizes quinate to produce 3-dehydroquinate (3-DHQ) in the periplasmic space. Even though a considerable activity is detected in the recombinant G. oxydans homologously overexpressing type II dehydroquinate dehydratase (DHQase) encoded in the aroQ gene at a pH where it grows, an alkaline shift of the culture medium is required for 3-DHS production in the middle of cultivation. Here, we attempted to adopt type I DHQase encoded in the aroD gene of Gluconacetobacter diazotrophicus strain PAL5 because the type I DHQase works optimally at weak acid, which is preferable for growth conditions of G. oxydans. In addition, we anticipated that subcellular localization of DHQase is the cytoplasm, and therefore, transports of 3-DHQ and 3-DHS across the cytoplasmic membrane are rate-limiting steps in the biotransformation. The Sec- and TAT-dependent signal sequences for secretion were attached to the N terminus of AroD to change the subcellular localization. G. oxydans that expresses the TAT-AroD derivative achieved 3-DHS production at a tenfold higher rate than the reference strain that expresses wild-type AroD even devoid of alkaline shift. Enzyme activity with the intact cell suspension and signal sequence cleavage supported the relocation of AroD to the periplasmic space. The present study suggests that the relocation of DHQase improves 3-DHS production in G. oxydans and represents a proof of concept for the potential of enzyme relocation in metabolic engineering. KEY POINTS: • Type-I dehydroquinate dehydratase (DHQase) was expressed in Gluconobacter oxydans. • Cytoplasmic DHQase was relocated to the periplasmic space in G. oxydans. • Relocation of DHQase in G. oxydans improved 3-dehydroshikimate production.
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Affiliation(s)
- Kentaro Nakamura
- Division of Agricultural Science, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Kakeru Nagaki
- Joint Degree Program of Kasetsart University and Yamaguchi University, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Minenosuke Matsutani
- Division of Agricultural Science, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan.,Research Center for Thermotolerant Microbial Resources, Yamaguchi University, 753-8515, Yamaguchi, Japan
| | - Osao Adachi
- Division of Agricultural Science, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Naoya Kataoka
- Division of Agricultural Science, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan.,Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi, 753-8515, Japan.,Research Center for Thermotolerant Microbial Resources, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Yoshitaka Ano
- Department of Bioscience, Graduate School of Agriculture, Ehime University, Matsuyama, 796-8566, Japan
| | - Gunjana Theeragool
- Joint Degree Program of Kasetsart University and Yamaguchi University, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan.,Department of Microbiology, Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Kazunobu Matsushita
- Division of Agricultural Science, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan.,Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi, 753-8515, Japan.,Research Center for Thermotolerant Microbial Resources, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Toshiharu Yakushi
- Division of Agricultural Science, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan. .,Joint Degree Program of Kasetsart University and Yamaguchi University, Graduate School of Science and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan. .,Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi, 753-8515, Japan. .,Research Center for Thermotolerant Microbial Resources, Yamaguchi University, Yamaguchi, 753-8515, Japan.
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