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Pichia kudriavzevii

ABSTRACT: Yeast used in food processing and an opportunistic pathogen

PROVIDER: PRJNA171287 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR10415400_1.fastq.gz	Fastqsanger.gz
	SRR10415400_2.fastq.gz	Fastqsanger.gz
	SRR10417800_1.fastq.gz	Fastqsanger.gz
	SRR10417800_2.fastq.gz	Fastqsanger.gz

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Identification and characterization of C4 dicarboxylic acid transporters in Pichia kudriavzevii CY902 strain

Project description:RNA-seq libraries were constructed for three samples, including (I) ΔURA3 strain grown in SD medium containing 2% w/v glucose(pH=5.0);(II)ΔURA3 strain grown in SD medium containing 2%w/v glucose and 2% w/v succinic acid(pH=5.0);(III)ΔURA3 strain grown in SD medium containing 2% w/v succinic acid(pH=5.0). For preparation of RNA samples, ΔURA3 cells grown overnight were inoculated into 50 ml liquid Synthetic Dextrose (SD) medium with the initial inoculation amount of OD600= 0.1, and cultured for 24 hours to the logarithmic growth phase (OD600= 2-3). The cells were collected by centrifugation at 6000g for 5 minutes. After washing twice with phosphate buffer saline (PBS), they were inoculated into new 50 mL SD medium containing carbon sources of different combinations of glucose and succinic acid .The pH of the culture sample is adjusted to 5.0 with NaOH. After flask culturing at 30°C and 250 rpm for an additional three hours, the yeast cells were collected by centrifugation for total RNA isolation and Illumina RNA-seq library construction. Total RNA for samples were isolated using TRIzol reagent (Invitrogen, Grand Island, USA), then used for high-throughput RNA sequencing. The 150-nt paired-end RNA-seq libraries were generated commercially at Novogene Biotechnology Co. Ltd (Tianjin, China) by using Illumina’s Hiseq X Ten platform (Illumina, San Diego, USA). Each sample contains two biological replicates.

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Project description:The yeast strain SJP-SNU was investigated as a probiotic and was characterized with respect to growth temperature, bile salt resistance, hydrogen sulfide reducing activity, intestinal survival ability and chicken embryo pathogenicity. In addition, we determined the complete genomic and mitochondrial sequences of SJP-SNU and conducted comparative genomics analyses. SJP-SNU grew rapidly at 37 °C and formed colonies on MacConkey agar containing bile salt. SJP-SNU reduced hydrogen sulfide produced by Salmonella serotype Enteritidis and, after being fed to 4-week-old chickens, could be isolated from cecal feces. SJP-SNU did not cause mortality in 10-day-old chicken embryos. From 13 initial contigs, 11 were finally assembled and represented 10 chromosomal sequences and 1 mitochondrial DNA sequence. Comparative genomic analyses revealed that SJP-SNU was a strain of Pichia kudriavzevii. Although SJP-SNU possesses pathogenicity-related genes, they showed very low amino acid sequence identities to those of Candida albicans. Furthermore, SJP-SNU possessed useful genes, such as phytases and cellulase. Thus, SJP-SNU is a useful yeast possessing the basic traits of a probiotic, and further studies to demonstrate its efficacy as a probiotic in the future may be warranted.

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