Enhancement of toyocamycin production through increasing supply of precursor GTP in Streptomyces diastatochromogenes 1628. (25th January 2022)

• Record Type: Journal Article
• Authors: Zhang, Jinyao; Xu, Jie; Li, Huijie; Zhang, Yongyong; Ma, Zheng; Bechthold, Andreas; Yu, Xiaoping
• Is Part Of: Journal of basic microbiology. Volume 62:issue 6(2022)
• Page Start: 750
• Page End: 759
• Publication Date: 2022-01-25
• Subjects: GTP -- precursor engineering -- ribose‐phosphate pyrophosphokinase -- toyocamycin; Microbiology -- Periodicals; 579
• DOI: 10.1002/jobm.202100622
• Languages: English
• ISSNs: 0233-111X

Abstract

Abstract: The nucleoside antibiotic toyocamycin (TM), which is produced by Streptomyces diastatochromogenes 1628, exhibits potent activity against a broad range of phytopathogenic fungi. TM was synthesized through a multi‐step reaction, using guanosine triphosphate (GTP) as precursor. Based on a comparison of proteomics data from S. diastatochromogenes 1628 and rifamycin‐resistant mutant 1628‐T15 with high yield of TM, we determined that the differentially expressed protein X0NBV6 called ribose‐phosphate pyrophosphokinase (RHP), which is a rate‐limiting enzyme involved in the de novo biosynthesis of GTP, exhibits a higher expression level in mutant 1628‐T15. In this study, to elucidate the relationships between RHP, GTP, and TM production, the gene rhp sd encoding RHP was cloned and overexpressed in S. diastatochromogenes strain 1628. The recombinant strain S. diastatochromogenes 1628‐RHP exhibited better performance at the transcriptional level of the rhp sd gene, as well as RHP enzymatic activity, intracellular GTP concentration, and TM production, compared to S. diastatochromogenes 1628. Finally, the yield of TM produced by S. diastatochromogenes 1628‐RHP (340.2 mg/L) was 133.3% higher than that produced by S. diastatochromogenes 1628. Moreover, the transcriptional level of toy genes involved in TM biosynthesis was enhanced due to the overexpression of the rhp sd gene.