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RNAseq analysis of Pseudozyma hubeiensis BOT-O on glucose or xylose before and after nitrogen-starvation

ABSTRACT: RNAseq analysis of Pseudozyma hubeiensis BOT-O on glucose or xylose before and after nitrogen-starvation

PROVIDER: PRJNA798717 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR17662918_1.fastq.gz	Fastqsanger.gz
	SRR17662918_2.fastq.gz	Fastqsanger.gz
	SRR17662919_1.fastq.gz	Fastqsanger.gz
	SRR17662919_2.fastq.gz	Fastqsanger.gz
	SRR17662920_1.fastq.gz	Fastqsanger.gz

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RNAseq analysis of Pseudozyma hubeiensis BOT-O on glucose or xylose before and after nitrogen-starvation

Project description:Pseudozyma hubeiensis is a basidiomycete yeast that has the highly desirable traits for lignocellulose valorisation of being equally efficient at utilization of glucose and xylose, and capable of their co-utilization. The species has previously mainly been studied for its capacity to produce secreted biosurfactants in the form of mannosylerythritol lipids, but it is also an oleaginous species capable of accumulating high levels of triacylglycerol storage lipids during nutrient starvation. In this study, we aimed to further characterize the oleaginous nature of P. hubeiensis by evaluating metabolism and gene expression responses during storage lipid formation conditions with glucose or xylose as a carbon source.

2023-03-09 | GSE193998 | GEO

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Project description:Oleaginous yeasts are capable of accumulating high levels of intracellular storage lipids from excess carbon during times when other key nutrients are limited. The basidiomycete yeast Rhodosporidium toruloides is an emerging host for microbial cell factory applications thanks to its naturally high lipid and carotenoid production. However, the engineering toolbox in this non-model host is limited and is currently a bottleneck for implementation of metabolic engineering strategies. In this study, we performed differential gene expression analysis with the goal to identify promoters that are strongly induced or repressed by nitrogen-limitation, a condition that is commonly used to induce lipid accumulation in oleaginous yeasts. The genome-wide transcriptional response of R. toruloides BOT-A2 was analysed using RNAseq during exponential growth and nitrogen-starvation, with either glucose or xylose as the sole carbon source. To validate the differential gene expression findings, reporter genes were constructed by placing the candidate promoters in control of a fluorescent protein, integrated in BOT-A2 and evaluated in vivo.

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Lipid production through simultaneous utilization of glucose, xylose, and L-arabinose by Pseudozyma hubeiensis: a comparative screening study.

Project description:Co-fermentation of glucose, xylose and L-arabinose from lignocellulosic biomass by an oleaginous yeast is anticipated as a method for biodiesel production. However, most yeasts ferment glucose first before consuming pentoses, due to glucose repression. This preferential utilization results in delayed fermentation time and lower productivity. Therefore, co-fermentation of lignocellulosic sugars could achieve cost-effective conversion of lignocellulosic biomass to microbial lipid. Comprehensive screening of oleaginous yeasts capable of simultaneously utilizing glucose, xylose, and L-arabinose was performed by measuring the concentration of sugars remaining in the medium and of lipids accumulated in the cells. We found that of 1189 strains tested, 12 had the ability to co-ferment the sugars. The basidiomycete yeast Pseudozyma hubeiensis IPM1-10, which had the highest sugars consumption rate of 94.1 %, was selected by culturing in a batch culture with the mixed-sugar medium. The strain showed (1) simultaneous utilization of all three sugars, and (2) high lipid-accumulating ability. This study suggests that P. hubeiensis IPM1-10 is a promising candidate for second-generation biodiesel production from hydrolysate of lignocellulosic biomass.

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Project description:Investigation of whole genome gene expression level in Pseudozyma antarctica T-34, compared to Ustilago maydis UM521. To clarify the transcriptomic characteristics of Pseudozyma antarctica under the conditions of high MEL production, a DNA microarray of both the strains, Pseudozyma antarctica T-34 and Ustilago maydis UM521 was prepared and analyzed the transcriptomes.

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