Background: Like many bacteria, Vibrio cholerae deploys a harpoon-like type VI secretion system (T6SS) to compete against other microbes in environmental and host settings. The T6SS punctures adjacent cells and delivers toxic effector proteins that are harmless to bacteria carrying cognate immunity factors. Only four effector/immunity pairs encoded on one large and three auxiliary gene clusters have been characterized from largely clonal, patient-derived strains of V. cholerae.
Results: We sequence two dozen V. cholerae strain genomes from diverse sources and develop a novel and adaptable bioinformatics tool based on hidden Markov models. We identify two new T6SS auxiliary gene clusters and describe Aux 5 here. Four Aux 5 loci are present in the host strain, each with an atypical effector/immunity gene organization. Structural prediction of the putative effector indicates it is a lipase, which we name TleV1 (type VI lipase effector Vibrio). Ectopic TleV1 expression induces toxicity in Escherichia coli, which is rescued by co-expression of the TliV1a immunity factor. A clinical V. cholerae reference strain expressing the Aux 5 cluster uses TleV1 to lyse its parental strain upon contact via its T6SS but is unable to kill parental cells expressing the TliV1a immunity factor.
Conclusion: We develop a novel bioinformatics method and identify new T6SS gene clusters in V. cholerae. We also show the TleV1 toxin is delivered in a T6SS manner by V. cholerae and can lyse other bacterial cells. Our web-based tool can be modified to identify additional novel T6SS genomic loci in diverse bacterial species.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6691524 | PMC |
http://dx.doi.org/10.1186/s13059-019-1765-5 | DOI Listing |
BMC Plant Biol
December 2024
Institute of Industrial Crops, Shandong Academy of Agricultural Sciences, Jinan, Shandong, 250100, China.
Background: Early-maturity cotton varieties have the potential to be cultivated in a wider geographical area, extending as far north as 46 °N in China, and confer to address the issue of competition for land between grain and cotton by reducing their whole growth period (WGP). Therefore, it is of great importance to develop cotton varieties with comprehensive early maturity and high yield following investigating the regulatory mechanism underlying early maturity and identifying early maturity-related genes.
Results: In this study, 'SCRC19' and 'SCRC21', two excellent cultivars with significantly different WGP, along with their recombinant inbred lines (RILs) consisting of 150 individuals were re-sequenced, yielding 4,092,677 high-quality single nucleotide polymorphisms (SNPs) and 794 bin markers across 26 chromosomes.
PLoS One
December 2024
Department of Medical Records Management and Statistics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Unlabelled: Although the link between ischemia-reperfusion injury (IRI) and T cell-mediated rejection (TCMR) in kidney transplantation (KT) is well known, the mechanism remains unclear. We investigated essential genes and biological processes involved in interactions between IRI and TCMR.
Methods: Renal IRI and TCMR datasets were obtained from the Gene Expression Omnibus database.
Plant Cell Rep
December 2024
Institute of Nanfan & Seed Industry, Guangdong Academy of Sciences, Guangzhou, 510000, Guangdong, China.
A total of 24 genes of vacuolar H-translocating pyrophosphatases H-PPases (VPP) genes were identified in Saccharum spontaneum AP85-441 and the ScVPP1-overexpressed Arabidopsis plants conferred salt tolerance. The vital role of vacuolar H-translocating pyrophosphatases H-PPases (VPP) genes involved in plants in response to abiotic stresses. However, the understanding of VPP functions in sugarcane remained unclear.
View Article and Find Full Text PDFmSystems
December 2024
School of Biological Sciences, The University of Auckland, Auckland, New Zealand.
The genus () is most often associated with human clinical samples and livestock. However, are also prevalent in the hindgut of the marine herbivorous fish (Silver Drummer), and analysis of their carbohydrate-active enzyme (CAZyme) encoding gene repertoires suggests degrade macroalgal biomass to support fish nutrition. To further explore host-associated traits unique to -derived , we compared 445 high-quality genomes of available in public databases (e.
View Article and Find Full Text PDFPediatr Infect Dis J
December 2024
Public Health Laboratory, Secretaria de Saúde do Estado do Paraná, Curitiba, Brazil.
Background: Respiratory syncytial virus (hRSV) infections primarily cause acute respiratory illness and pediatric hospitalizations. We examined the hRSV molecular epidemiology in a pediatric cohort over a 4-year period and described the interrelationship with clinical data.
Methods: A cross-sectional study was conducted from 2014 to 2017 on children with acute respiratory illness.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!