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Hafnia alvei

ABSTRACT: Hafnia alvei Genome sequencing and assembly

PROVIDER: PRJNA236111 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR3189900_1.fastq.gz	Fastqsanger.gz
	SRR3189900_2.fastq.gz	Fastqsanger.gz
	SRR3210970_1.fastq.gz	Fastqsanger.gz
	SRR3210970_2.fastq.gz	Fastqsanger.gz

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Project description:Hafnia alvei H4 is a bacteria subject to regulation by N-acyl-l-homoserine lactone (AHL)-mediated quorum sensing system and is closely related to the corruption of instant sea cucumber. Studying the effect of Hafnia alvei H4 quorum sensing regulatory genes on AHLs is necessary for the quality and preservation of instant sea cucumber. In this study, the draft genome of H. alvei H4, which comprises a single chromosome of 4,687,151 bp, was sequenced and analyzed and the types of AHLs were analyzed employing thin-layer chromatography (TLC) and LC-MS/MS. Then the wild-type strain of H. alvei H4 and the luxI/R double mutant (ΔluxIR) were compared by transcriptome sequencing (RNA-seq). The results indicate that the incomplete genome sequence revealed the presence of one quorum-sensing (QS) gene set, designated as lasI/expR. Three major AHLs, N-hexanoyl-L-homoserine lactone (C6-HSL), N-butyryl-L-homoserine lactone (C4-HSL), and N-(3-oxo-octanoyl)-L-homoserine lactone (3-oxo-C8-HSL) were found, with C6-HSL being the most abundant. C6-HSL was not detected in the culture of the luxI mutant (ΔluxI) and higher levels of C4-HSL was found in the culture of the luxR mutant (ΔluxR), which suggested that the luxR gene may have a positive effect on C4-HSL production. It was also found that AHL and QS genes are closely related in the absence of luxIR double deletion. The results of this study can further elucidate at the genetic level that luxI and luxR genes are involved in the regulation of AHL.

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