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Photorhabdus laumondii subsp. laumondii strain:DJC

ABSTRACT: Photorhabdus luminescens subsp. laumondii strain DJC Genome sequencing and assembly

PROVIDER: PRJNA418232 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR7001683_subreads.fastq.gz	Fastqsanger.gz
	SRR7008005_subreads.fastq.gz	Fastqsanger.gz

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The T6SSs of the entomopathogenic Photorhabdus laumondii revealed interbacterial competition and cross-link with diverse Photorhabdus-virulence mechanisms

Project description:Secretion systems are used as weapons by a variety of Gram-negative bacteria. Among them the Type VI Secretion System (T6SS) gained more interest throughout the last years. The system functions as a molecular nano-weapon: it is used in inter-kingdom competition by various bacteria to deliver toxic effectors in target cells. Here we describe the role of the T6SS in Photorhabdus laumondii subsp. laumondii strain DJC, an entomopathogenic biocontrol agent able to live in different environmental niches, such as in symbiosis with nematodes and in the rhizosphere on plant roots. Using bioinformatic and protein motif analyses we identified four T6SS gene clusters (T6SS-1, T6SS-2, T6SS-3 and T6SS-4) and multiple orphan T6SS related genes in the genome of P. laumondii. Furthermore, we highlighted 11 T6SS effector-immunity pairs, including three undescribed membrane disrupting effectors, each with putatively different antibacterial activities. By label-free mass spectrometry of P. laumondii wild type cells and respective T6SS-deficient strains, we could point out a cross-link between T6SS and other Photorhabdus’ virulence related mechanisms such as PVCs, T3SS and pyocins. Furthermore, a change in motility as well as in the secondary metabolism was observed upon T6SS-deficiency. Here, we shed light on the T6SS in P. laumondii DJC and suggesting a cross-link of various virulence mechanisms, which could help to gain knowledge on T6SS and better figure out the Photorhabdus ability to live in polymicrobial environments.

2024-04-05 | PXD035720 | Pride

Photorhabdus laumondii

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Photorhabdus laumondii strain:T181

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Photorhabdus laumondii subsp. laumondii TTO1

Project description:DNA adenine methyltransferase (Dam) overexpression impairs Photorhabdus luminescens motility and virulence

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DNA adenine methyltransferase (Dam) overexpression impairs Photorhabdus luminescens motility and virulence

Project description:Dam, the most described bacterial DNA-methyltransferase, is widespread in gamma-proteobacteria. Dam DNA methylation can play a role in various genes expression and is involved in pathogenicity of several bacterial species. In the entomopathogenic bacterium Photorhabdus luminescens, a dam ortholog was identified. Overexpression of dam in P. luminescens did not impair growth ability in vitro. In contrast, compared to a control strain harboring an empty plasmid, a significant decrease in motility was observed in the dam-overexpressing strain. In addition, the dam-overexpressing P. luminescens strain showed a delayed virulence compared to that of the control strain after injection in larvae of the lepidopteran Spodoptera littoralis. These results reveal that Dam plays a major role during P. luminescens insect infection.

2017-10-04 | GSE100650 | GEO

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