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Role of the major determinant of polar flagellation FlhG in the endoflagella-containing spirochete Leptospira

ABSTRACT: Role of the major determinant of polar flagellation FlhG in the endoflagella-containing spirochete Leptospira

PROVIDER: PRJNA719355 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14134769.fastq.gz	Fastqsanger.gz
	SRR14134770.fastq.gz	Fastqsanger.gz
	SRR14134771.fastq.gz	Fastqsanger.gz
	SRR14134772.fastq.gz	Fastqsanger.gz
	SRR14134773.fastq.gz	Fastqsanger.gz

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Role of the major determinant of polar flagellation FlhG in the endoflagella-containing spirochete Leptospira

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Project description:Transmission of leptospirosis requires that the spirochete pathogen adapts rapidly to the mammalian host milieu during infection and the external environment upon shedding from the renal tubules of animal reservoirs. The pathogenic Leptospira genomes encode a notably large number (≥76) of putative two-component system (TCS) proteins, which presumably play a key role in switching the ecological niches. Yet to date, the regulatory networks that govern virulence and environmental adaptation have not been elucidated in Leptospira. We identified seven ORFs encoding putative TCS proteins that are exclusively conserved in all the pathogenic Leptospira species. Two of these ORFs (LMANv2_670020, LMANv2_670019), juxtaposed in an operon, are predicted to encode a cytoplasmic hybrid histidine kinase and response regulator. Corresponding transposon mutants ΔlvrA/B and ΔlvrB demonstrated a loss-of-virulence in a hamster model of leptospirosis and aberrant motility phenotype. RNA sequencing revealed the differential expression of transcripts on a global scale in ΔlvrA/B (8.13%), ΔlvrB (5.06%) and ΔlvrA/B∩ΔlvrB (8.24%). In vitro transcriptomes provided insights into the role of Lvr dyad in regulating virulence, motility, signal transduction and metabolism related genes. Phosphotransfer assays indicated that LvrA interacts with LvrB in a branched signaling pathway. Phylogenetic analyses indicated that Our findings suggest that a novel, hybrid two-component system Lvr plays a key role in governing virulence and mediating global regulation in pathogenic Leptospira.

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Lysinoalanine crosslinking is a conserved post-translational modification in the spirochete flagellar hookLysinoalanine crosslinking is a conserved post-translational modification in the spirochete flagellar hook

Project description:In this project, we investigated whether diverse spirochete species contain lysinoalanine cross-linkages between conserved residues in their flagellar hook proteins (FlgE). We examined the following species: Treponema denticola¸ Borreliella burgdorferi, Treponema phagedenis, Treponema pallidum, Brachyspira hyodysenteriae, Leptospira interrogans. For each bacterial species, we examined a variety of different sample types, including recombinantly produced FlgE, polyhooks purified from flik knock-out strains, and wild-type periplasmic filaments. Overall, our data suggests that lysinoalanine crosslinking in a conserved FlgE post-translational modification in spirochetes and is required for the unique motility of these organisms. For more information, please see the following manuscript: https://doi.org/10.1101/2023.06.13.544825.

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