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Regulation of nutrient utilization in filamentous fungi

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Abstract

Organisms must accurately sense and respond to nutrients to survive. In filamentous fungi, accurate nutrient sensing is important in the establishment of fungal colonies and in continued, rapid growth for the exploitation of environmental resources. To ensure efficient nutrient utilization, fungi have evolved a combination of activating and repressing genetic networks to tightly regulate metabolic pathways and distinguish between preferred nutrients, which require minimal energy and resources to utilize, and nonpreferred nutrients, which have more energy-intensive catabolic requirements. Genes necessary for the utilization of nonpreferred carbon sources are activated by transcription factors that respond to the presence of the specific nutrient and repressed by transcription factors that respond to the presence of preferred carbohydrates. Utilization of nonpreferred nitrogen sources generally requires two transcription factors. Pathway-specific transcription factors respond to the presence of a specific nonpreferred nitrogen source, while another transcription factor activates genes in the absence of preferred nitrogen sources. In this review, we discuss the roles of transcription factors and upstream regulatory genes that respond to preferred and nonpreferred carbon and nitrogen sources and their roles in regulating carbon and nitrogen catabolism.

Key points

Interplay of activating and repressing transcriptional networks regulates catabolism.

Nutrient-specific activating transcriptional pathways provide metabolic specificity.

Repressing regulatory systems differentiate nutrients in mixed nutrient environments.

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Funding

J. D. K. was supported by a National Institutes of Health Ruth L. Kirschstein National Research Service Award Institutional Research Training Grant 5 T32 AI145821-03. The funding source had no involvement in the writing of this review.

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J. D. K. and L. B. H. developed the idea for the manuscript, performed the literature search and data analysis, and drafted and critically revised the manuscript.

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Correspondence to Lori B. Huberman.

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This article does not contain studies with human or animal participants performed by the authors.

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The authors declare no competing interests.

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Kerkaert, J.D., Huberman, L.B. Regulation of nutrient utilization in filamentous fungi. Appl Microbiol Biotechnol 107, 5873–5898 (2023). https://doi.org/10.1007/s00253-023-12680-4

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  • DOI: https://doi.org/10.1007/s00253-023-12680-4

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