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Key components of the eight classes of type IV secretion systems involved in bacterial conjugation or protein secretion

AutorGuglielmini, Julien; Néron, Bertrand; Abby, Sophie S.; Garcillán-Barcia, M. Pilar; Cruz, Fernando de la ; Rocha, Eduardo P. C.
Fecha de publicación2014
EditorOxford University Press
CitaciónNucleic Acids Research 42(9): 5715-5727 (2014)
ResumenConjugation of DNA through a type IV secretion system (T4SS) drives horizontal gene transfer. Yet little is known on the diversity of these nanomachines. We previously found that T4SS can be divided in eight classes based on the phylogeny of the only ubiquitous protein of T4SS (VirB4). Here, we use an ab initio approach to identify protein families systematically and specifically associated with VirB4 in each class. We built profiles for these proteins and used them to scan 2262 genomes for the presence of T4SS. Our analysis led to the identification of thousands of occurrences of 116 protein families for a total of 1623 T4SS. Importantly, we could identify almost always in our profiles the essential genes of well-studied T4SS. This allowed us to build a database with the largest number of T4SS described to date. Using profile-profile alignments, we reveal many new cases of homology between components of distant classes of T4SS. We mapped these similarities on the T4SS phylogenetic tree and thus obtained the patterns of acquisition and loss of these protein families in the history of T4SS. The identification of the key VirB4-associated proteins paves the way toward experimental analysis of poorly characterized T4SS classes.
DescripciónThis is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License.
Versión del editorhttp://dx.doi.org/10.1093/nar/gku194
URIhttp://hdl.handle.net/10261/130446
DOI10.1093/nar/gku194
Identificadoresdoi: 10.1093/nar/gku194
e-issn: 1362-4962
issn: 0305-1048
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