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Iwakata S, Asada K, Nishi T, Stepanova R, Shinoda S, Ueda D, Fujihashi M, Yasuno Y, Shinada T, Sato T. Insight into the mechanism of geranyl-β-phellandrene formation catalyzed by Class IB terpene synthases. Biosci Biotechnol Biochem 2022; 86:724-729. [PMID: 35287170 DOI: 10.1093/bbb/zbac036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 03/08/2022] [Indexed: 11/12/2022]
Abstract
Terpene synthase (TS) from Bacillus alcalophilus (BalTS) is the only Class IB TS for which a 3D structure has been elucidated. Recently, geranyl-β-phellandrene, a novel cyclic diterpene, was identified as a product of BalTS in addition to the acyclic β-springene. In the present study, we have provided insight into the mechanism of geranyl-β-phellandrene formation. Deuterium labeling experiments revealed that the compound is produced via a 1,3-hydride shift. In addition, nonenzymatic reactions using divalent metal ions were performed. The enzyme is essential for the geranyl-β-phellandrene formation. Furthermore, BalTS variants targeting tyrosine residues enhanced the yield of geranyl-β-phellandrene and the proportion of the compound of the total products. It was suggested that the expansion of the active site space may allow the conformation of the intermediates necessary for cyclization. The present study describes the first Class IB TSs to successfully alter product profiles while retaining high enzyme activity.
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Affiliation(s)
- Shogo Iwakata
- Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, Japan
| | - Kazuya Asada
- Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, Japan
| | - Tomoyuki Nishi
- Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, Japan
| | - Rafaella Stepanova
- Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, Japan
| | - So Shinoda
- Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, Japan
| | - Daijiro Ueda
- Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, Japan
| | - Masahiro Fujihashi
- Department of Chemistry, Faculty of Medicine, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
| | - Yoko Yasuno
- Graduate School of Science, Osaka City University, Sumiyoshi, Osaka, Japan
| | - Tetsuro Shinada
- Graduate School of Science, Osaka City University, Sumiyoshi, Osaka, Japan
| | - Tsutomu Sato
- Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata, Japan
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