Unraveling the Molecular Basis of Mycosporine Biosynthesis in Fungi

Autor: Dionisia Sepúlveda, Sebastián Campusano, Martín Moliné, Salvador Barahona, Marcelo Baeza, Jennifer Alcaíno, Fernando Colabella, Blanca Urzúa, Diego Libkind, Víctor Cifuentes
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: International Journal of Molecular Sciences, Vol 24, Iss 6, p 5930 (2023)
Druh dokumentu: article
ISSN: 1422-0067
1661-6596
DOI: 10.3390/ijms24065930
Popis: The Phaffia rhodozyma UCD 67-385 genome harbors a 7873 bp cluster containing DDGS, OMT, and ATPG, encoding 2-desmethy-4-deoxygadusol synthase, O-methyl transferase, and ATP-grasp ligase, respectively, of the mycosporine glutaminol (MG) biosynthesis pathway. Homozygous deletion mutants of the entire cluster, single-gene mutants, and the Δddgs−/−;Δomt−/− and Δomt−/−;Δatpg−/− double-gene mutants did not produce mycosporines. However, Δatpg−/− accumulated the intermediate 4-deoxygadusol. Heterologous expression of the DDGS and OMT or DDGS, OMT, and ATPG cDNAs in Saccharomyces cerevisiae led to 4-deoxygadusol or MG production, respectively. Genetic integration of the complete cluster into the genome of the non-mycosporine-producing CBS 6938 wild-type strain resulted in a transgenic strain (CBS 6938_MYC) that produced MG and mycosporine glutaminol glucoside. These results indicate the function of DDGS, OMT, and ATPG in the mycosporine biosynthesis pathway. The transcription factor gene mutants Δmig1−/−, Δcyc8−/−, and Δopi1−/− showed upregulation, Δrox1−/− and Δskn7−/− showed downregulation, and Δtup6−/− and Δyap6−/− showed no effect on mycosporinogenesis in glucose-containing medium. Finally, comparative analysis of the cluster sequences in several P. rhodozyma strains and the four newly described species of the genus showed the phylogenetic relationship of the P. rhodozyma strains and their differentiation from the other species of the genus Phaffia.
Databáze: Directory of Open Access Journals
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