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A single Gal4-like transcription factor activates the Crabtree effect in Komagataella phaffii

ABSTRACT: A single Gal4-like transcription factor activates the Crabtree effect in Komagataella phaffii

PROVIDER: PRJNA434119 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6727420_1.fastq.gz	Fastqsanger.gz
	SRR6727420_2.fastq.gz	Fastqsanger.gz
	SRR6727421_1.fastq.gz	Fastqsanger.gz
	SRR6727421_2.fastq.gz	Fastqsanger.gz
	SRR6727413_1.fastq.gz	Fastqsanger.gz

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A single Gal4-like transcription factor activates the Crabtree effect in Komagataella phaffii

Project description:The Crabtree phenotype defines whether a yeast can perform simultaneous respiration and fermentation under aerobic conditions at high growth rates, a phenomenon that resembles the Warburg effect in cancer cells. Whole genome duplication, global promoter rewiring and loss of respiratory complex I are the main molecular events that contributed to the evolution of Crabtree effect. Here we show that overexpression of a single Gal4-like transcription factor is sufficient to convert Crabtree-negative Komagataella phaffii (Pichia pastoris) into a Crabtree positive yeast. We report the transcriptome profile (RNASeq) of the Δgal4-like and Gal4-like overexpression K. phaffii strains. Upregulation of the glycolytic genes and a significant increase in glucose uptake rate due to the overexpression of the Gal4-like transcription factor caused an overflow metabolism, triggering both short-term and long-term Crabtree phenotypes. This indicates that a single mutation leading to overexpression of one gene may have been sufficient as a first molecular event towards respiro-fermentative metabolism in the course of yeast evolution.

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A single Gal4-like transcription factor activates the Crabtree effect in Komagataella phaffii.

Project description:The Crabtree phenotype defines whether a yeast can perform simultaneous respiration and fermentation under aerobic conditions at high growth rates. It provides Crabtree positive yeasts an evolutionary advantage of consuming glucose faster and producing ethanol to outcompete other microorganisms in sugar rich environments. While a number of genetic events are associated with the emergence of the Crabtree effect, its evolution remains unresolved. Here we show that overexpression of a single Gal4-like transcription factor is sufficient to convert Crabtree-negative Komagataella phaffii (Pichia pastoris) into a Crabtree positive yeast. Upregulation of the glycolytic genes and a significant increase in glucose uptake rate due to the overexpression of the Gal4-like transcription factor leads to an overflow metabolism, triggering both short-term and long-term Crabtree phenotypes. This indicates that a single genetic perturbation leading to overexpression of one gene may have been sufficient as the first molecular event towards respiro-fermentative metabolism in the course of yeast evolution.

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