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• W3030902950 endingPage "100028" @default.
• W3030902950 startingPage "100028" @default.
• W3030902950 abstract "Post-fermentation fungal biomass waste provides a viable source for chitin. Cell wall chitin of filamentous fungi, and in particular its de-N-acetylated derivative chitosan, has a wide range of commercial applications. Although the cell wall of filamentous fungi comprises 10–30% chitin, these yields are too low for cost-effective production. Therefore, we aimed to identify the genes involved in increased chitin deposition by screening a collection of UV-derived cell wall mutants in Aspergillus niger. This screen revealed a mutant strain (RD15.4#55) that showed a 30–40% increase in cell wall chitin compared to the wild type. In addition to the cell wall chitin phenotype, this strain also exhibited sensitivity to SDS and produces an unknown yellow pigment. Genome sequencing combined with classical genetic linkage analysis identified two mutated genes on chromosome VII that were linked with the mutant phenotype. Single gene knockouts and subsequent complementation analysis revealed that an 8 bp deletion in NRRL3_09595 is solely responsible for the associated phenotypes of RD15.4#55. The mutated gene, which was named cwcA (cell wall chitin A), encodes an orthologue of Saccharomyces cerevisiae Bypass of ESS1 (BYE1), a negative regulator of transcription elongation. We propose that this conserved fungal protein is involved in preventing cell wall integrity signaling under non-inducing conditions, where loss of function results in constitutive activation of the cell wall stress response pathway, and consequently leads to increased chitin content in the mutant cell wall." @default.
• W3030902950 created "2020-06-05" @default.
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• W3030902950 date "2020-12-01" @default.
• W3030902950 modified "2023-09-26" @default.
• W3030902950 title "Interrogation of the cell wall integrity pathway in Aspergillus niger identifies a putative negative regulator of transcription involved in chitin deposition" @default.
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• W3030902950 doi "https://doi.org/10.1016/j.gene.2020.100028" @default.
• W3030902950 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7285910" @default.
• W3030902950 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34493363" @default.
• W3030902950 hasPublicationYear "2020" @default.
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