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Genome Information for Aspergillus niger
Citric acid is a flagship bulk product of the fermentation industry, produced by the filamentous fungus Aspergillus niger. The biochemistry of citric acid accumulation in A. niger has extensively been studied, but many pieces of the puzzle remain to be elucidated. One is the absolute necessity of adjusting correct levels of Mn (II) ions in the growth medium. Citrate production will only occur when Mn (II) ions are present in very low (< 2 ppb) concentrations. Mn (II) deficiency has multiple effects on A. niger physiology. Mycelia grown under Mn (II)-deficient conditions form pellets, while increasing Mn (II) concentration to 14 ppb or above switches morphology to a filamentous one, accompanied by a rapid decline in citrate production. Mn (II) ions also block citrate uptake, impair protein and DNA synthesis, inhibit triglyceride and phospholipid synthesis. Our hypothesis was that multiple genetic elements are involved in the diverse phenotype that Mn (II) deficiency exerts. To test this, in collaboration with our Canadian partners at Concordia University (Quebec, Montreal), we analyse the transcriptome of the high citrate producer, genome-sequenced A. niger strain (ATCC 2270) by deep RNA sequencing from cultures that are cultivated at three, carefully set Mn (II) concentrations. These data will then be used to identify genes which display an at least 2-fold up- or downregulation in dependence on the availability of Mn (II). They will then be identified by BLASTP against the annotated proteins of A. niger. In short, our proposal aims to investigate the genes that primarily responds to Mn (II) ions in A. niger grown under quasi-industrial settings. The results may contribute to the better understanding and the practical control of one of the most important industrial fermentations.
Accession | PRJNA1032880 |
Data Type | Raw sequence reads |
Scope | Multiisolate |
Organism | Aspergillus niger[Taxonomy ID: 5061] Eukaryota; Fungi; Dikarya; Ascomycota; Pezizomycotina; Eurotiomycetes; Eurotiomycetidae; Eurotiales; Aspergillaceae; Aspergillus; Aspergillus subgen. Circumdati; Aspergillus niger |
Publications (total 6) Less... | - Published online: Molnár et al., "High oxygen tension increases itaconic acid accumulation, glucose consumption, and the expression and activity of alternative oxidase in Aspergillus terreus", Applied Microbiology and Biotechnology, 2018;102(20):8799-8808
- Published online: Karaffa L et al., "Citric acid and itaconic acid accumulation: variations of the same story?", Applied Microbiology and Biotechnology, 2019;103(7):2889-2902
- Published online: Kolláth I et al., "Manganese Deficiency Is Required for High Itaconic Acid Production From D-Xylose in Aspergillus terreus", Frontiers in Microbiology, 2019;10
- Published online: Fejes B et al., "The effects of external Mn2+ concentration on hyphal morphology and citric acid production are mediated primarily by the NRAMP-family transporter DmtA in Aspergillus niger", Microbial Cell Factories, 2020;19(1)
- Published online: Sándor E et al., "Carbon-Source Dependent Interplay of Copper and Manganese Ions Modulates the Morphology and Itaconic Acid Production in Aspergillus terreus", Frontiers in Microbiology, 2021;12
- Published online: Fekete E et al., "Bioreactor as the root cause of the “manganese effect” during Aspergillus niger citric acid fermentations", Frontiers in Bioengineering and Biotechnology, 2022;10
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Grants | - "Hungarian National Research, Development and Innovation Fund" (Grant ID K 138489, National Research, Development and Innovation Office)
- "Hungarian National Research, Development and Innovation Fund" (Grant ID NN 128867, National Research, Development and Innovation Office)
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Submission | Registration date: 27-Oct-2023 Concordia University |
Relevance | Industrial |
Project Data:
Resource Name | Number of Links |
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Sequence data |
SRA Experiments | 18 |
Other datasets |
BioSample | 18 |