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Transcriptomics identify the triggering of citrate export as the key event caused by manganese deficiency in Aspergillus niger

Author(s): Fekete E; Bíró V; Márton A; Bakondi-Kovács I; Sándor E; Kovács B; Geoffrion N; Tsang A; Kubicek CP; Karaffa L;

For over a century, the filamentous Ascomycete fungus Aspergillus niger has played a pivotal role in the industrial production of citric acid. A critical fermentation parameter that sustains high-yield citric acid accumulation is the suboptimal concentration of manganese(II) ions in the culture b ...

Article GUID: 39377610


Bioreactor as the root cause of the "manganese effect" during Aspergillus niger citric acid fermentations

Author(s): Fekete E; Bíró V; Márton A; Bakondi-Kovács I; Németh Z; Sándor E; Kovács B; Fábián I; Kubicek CP; Tsang A; Karaffa L;

High-yield citric acid production by the filamentous Ascomycete fungus Aspergillus niger requires a combination of extreme nutritional conditions, of which maintaining a low manganese (II) ion concentration (-1) is a key feature. Technical-scale production of citric acid predominantly uses stainl ...

Article GUID: 35992333


The chimeric GaaR-XlnR transcription factor induces pectinolytic activities in the presence of D-xylose in Aspergillus niger

Author(s): Kun RS; Garrigues S; Di Falco M; Tsang A; de Vries RP;

Aspergillus niger is a filamentous fungus well known for its ability to produce a wide variety of pectinolytic enzymes, which have many applications in the industry. The transcriptional activator GaaR is induced by 2-keto-3-deoxy-L-galactonate, a compound derived from D-galacturonic acid, and plays a major role in the regulation of pectinolytic genes. The ...

Article GUID: 34236481


Identification of a Novel Biosynthetic Gene Cluster in Aspergillus niger Using Comparative Genomics

Author(s): Evdokias G; Semper C; Mora-Ochomogo M; Di Falco M; Nguyen TTM; Savchenko A; Tsang A; Benoit-Gelber I;

Previously, DNA microarrays analysis showed that, in co-culture with Bacillus subtilis, a biosynthetic gene cluster anchored with a nonribosomal peptides synthetase of Aspergillus niger is downregulated. Based on phylogenetic and synteny analyses, we show here that this gene cluster, NRRL3_00036- ...

Article GUID: 34064722


Genetic Characterization of Mutations Related to Conidiophore Stalk Length Development in Aspergillus niger Laboratory Strain N402

Author(s): Demirci E; Arentshorst M; Yilmaz B; Swinkels A; Reid ID; Visser J; Tsang A; Ram AFJ;

Aspergillus niger is an important filamentous fungus in industrial biotechnology for the production of citric acid and enzymes. In the late 1980s, the A. niger N400/NRRL3 strain was selected for both fundamental and applied studies in relation to several processes including gluconic acid and protein production. To facilitate handling of A. niger, the N400 ...

Article GUID: 33959152


Biosynthesis of Alkylcitric Acids in Aspergillus niger Involves Both Co-localized and Unlinked Genes.

Author(s): Palys S, Pham TTM, Tsang A

Front Microbiol. 2020;11:1378 Authors: Palys S, Pham TTM, Tsang A

Article GUID: 32695080


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.

Author(s): Fejes B, Ouedraogo JP, Fekete E, Sándor E, Flipphi M, Soós Á, Molnár ÁP, Kovács B, Kubicek CP, Tsang A, Karaffa L

Microb Cell Fact. 2020 Jan 30;19(1):17 Authors: Fejes B, Ouedraogo JP, Fekete E, Sándor E, Flipphi M, Soós Á, Molnár ÁP, Kovács B, Kubicek CP, Tsang A, Karaffa L

Article GUID: 32000778


Four Aromatic Intradiol Ring Cleavage Dioxygenases from Aspergillus niger.

Author(s): Semana P, Powlowski J

Ring cleavage dioxygenases catalyze the critical ring-opening step in the catabolism of aromatic compounds. The archetypal filamentous fungus Aspergillus niger previously has been reported to be able to utilize a range of monocyclic aromatic compounds as sole sources of carbon and energy. The genome of A. niger has been sequenced, and deduced amino acid s ...

Article GUID: 31540981


Expression-based clustering of CAZyme-encoding genes of Aspergillus niger.

Author(s): Gruben BS, Mäkelä MR, Kowalczyk JE, Zhou M, Benoit-Gelber I, De Vries RP

BMC Genomics. 2017 Nov 23;18(1):900 Authors: Gruben BS, Mäkelä MR, Kowalczyk JE, Zhou M, Benoit-Gelber I, De Vries RP

Article GUID: 29169319


W361R mutation in GaaR, the regulator of D-galacturonic acid-responsive genes, leads to constitutive production of pectinases in Aspergillus niger.

Author(s): Alazi E, Niu J, Otto SB, Arentshorst M, Pham TTM, Tsang A, Ram AFJ

Microbiologyopen. 2019 May;8(5):e00732 Authors: Alazi E, Niu J, Otto SB, Arentshorst M, Pham TTM, Tsang A, Ram AFJ

Article GUID: 30298571


The presence of trace components significantly broadens the molecular response of Aspergillus niger to guar gum.

Author(s): Coconi Linares N, Di Falco M, Benoit-Gelber I, Gruben BS, Peng M, Tsang A, Mäkelä MR, de Vries RP

N Biotechnol. 2019 Jul 25;51:57-66 Authors: Coconi Linares N, Di Falco M, Benoit-Gelber I, Gruben BS, Peng M, Tsang A, Mäkelä MR, de Vries RP

Article GUID: 30797054


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