Distribution, Function and Regulation of Type 6 Secretion Systems of Xanthomonadales

Frontiers in Microbiology
Ethel Bayer-SantosCristina E Alvarez-Martinez

Abstract

Members of the Xanthomonadales order include several plant pathogens of significant economic and agricultural impact, such as Xanthomonas spp. Type 6 secretion systems (T6SSs) are contractile nanomachines used by many bacterial species to inject protein effectors into target prokaryotic and eukaryotic cells and provide a competitive advantage for bacteria in different environments. Effectors with antibacterial properties include peptidoglycan hydrolases, lipases and phospholipases that break down structural components of the cell envelope, promoting target-cell lysis; and RNases, DNAses, and NADases that affect target-cell metabolism, arresting growth. Effectors with anti-eukaryotic properties are functionally more diverse. The T6SS of Xanthomonas citri is the only example experimentally characterized so far within the Xanthomonadales order and displays anti-eukaryotic function by providing resistance to predation by amoeba. This T6SS is regulated at the transcriptional level by a signaling cascade involving a Ser/Thr kinase and an extracytoplasmic function (ECF) sigma factor. In this review, we performed in silico analyses of 35 genomes of Xanthomonadales and showed that T6SSs are widely distributed and phylogenetically classi...Continue Reading

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Citations

Apr 30, 2020·Nature Reviews. Microbiology·Sujan TimilsinaJeffrey B Jones
Jan 12, 2021·Computational and Structural Biotechnology Journal·Cristina E Alvarez-MartinezChuck S Farah
Jan 8, 2021·BMC Microbiology·Nathaly Andrea Montenegro BenavidesAdriana Bernal
Jul 7, 2021·Molecular Plant Pathology·Carlos A Zárate-ChavesBoris Szurek

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