Abstract
Glycerol dehydrogenase has been identified and characterized functionally in many species. However, little is known about glycerol dehydrogenase genes and their functions in Aspergillus oryzae. Here, a total of 45 glycerol dehydrogenase genes in Aspergillus oryzae were identified and renamed from AoGld1 to AoGld45 according to their chromosome distribution. They were classified into three groups based on phylogenetic analysis. Synteny analysis revealed that thirteen AoGld genes are conserved among Aspergillus species. Promoter analysis displayed that AoGld3 and AoGld13 harbored multiple binding elements of GATA-type transcription factors and zinc-finger protein msnA that were involved in nitrogen and kojic acid metabolism, respectively. Moreover, the AoGld3 deletion strain Δgld3 was generated by the CRISPR/Cas9 system, which had no visible growth defects compared with the control wild-type strain under the control and osmotic stress treatments. However, disruption of AoGld3 led to the inhibition of kojic acid production, and the expression of kojA, kojR was down-regulated in the Δgld3 strain. Furthermore, when kojA or kojR was overexpressed in the Δgld3 strain, the yield of kojic acid was restored, suggesting that AoGld3 is involved in kojic acid production through affecting the expression of kojR and kojA. Taken together, these findings provide new insights into our understanding of glycerol dehydrogenase and establish foundation for further study of their roles in Aspergillus oryzae.
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Acknowledgements
We thank Dr. Van-Tuan Tran for kindly providing the pEX1 vector. This work was supported by Science and Technology Research Project of Jiangxi Provincial Department of Education (GJJ190611, GJJ180630) and Doctoral Scientific Research Foundation of Jiangxi Science and Technology Normal University (2018BSQD030).
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Fan, J., Zhang, Z., Long, C. et al. Identification and functional characterization of glycerol dehydrogenase reveal the role in kojic acid synthesis in Aspergillus oryzae. World J Microbiol Biotechnol 36, 136 (2020). https://doi.org/10.1007/s11274-020-02912-4
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DOI: https://doi.org/10.1007/s11274-020-02912-4