Protein O-mannosyltransferases are required for sterigmatocystin production and developmental processes in Aspergillus nidulans
| Autor: | Masatoshi Goto, Ayana Oki, Kiminori Shimizu, Thi Huynh Tram Le |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Aflatoxin Sterigmatocystin 030106 microbiology Mutant Genes Fungal Isozyme Mannosyltransferases Aspergillus nidulans Microbiology 03 medical and health sciences chemistry.chemical_compound Biosynthesis Gene Expression Regulation Fungal Genetics Gene biology Genetic Complementation Test Wild type General Medicine biology.organism_classification Isoenzymes 030104 developmental biology chemistry Gene Knockdown Techniques Mutation Carcinogens Gene Deletion |
| Zdroj: | Current genetics. 64(5) |
| ISSN: | 1432-0983 |
| Popis: | Aspergillus nidulans produces sterigmatocystin (ST), a precursor of a carcinogenic secondary metabolite aflatoxin (AF), during its developmental process. ST biosynthesis has been shown to be affected by various regulatory factors. In this study, we investigated the involvement of O-mannosyltransferases (PmtA, PmtB, PmtC), in ST production and morphological development. Deletion of pmtA (ΔpmtA), pmtB (ΔpmtB) or pmtC (ΔpmtC) caused no spore production and a significant decline of vegetative growth. A tremendous decline of ST level was observed in all Δpmt mutants at the third day after inoculation. By extending the growth period, ST production of ΔpmtA and ΔpmtB increased to the wild-type level 7 days after inoculation. On the other hand, ST was not detected from 7- or 14-day cultures in ΔpmtC. Expression levels of aflR gene, an essential regulator of the ST biosynthesis pathway, were also down-regulated in the Δpmt strains. By introducing the aflR overexpression cassette, ST production in the ΔpmtA and ΔpmtB significantly increased to levels comparable to the wild type. However, the presence of the aflR overexpression cassette could not improve ST production in the ΔpmtC mutant. These data suggest that the PMT family is a new endogenous factor that is required for ST biosynthesis in A. nidulans. These findings provide better understanding of the regulatory mechanisms of AF/ST biosynthesis, which can ultimately contribute to our ability to control aflatoxin contamination. |
| Databáze: | OpenAIRE |
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