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Relaxase MobM Induces a Molecular Switch at Its Cognate Origin of Transfer

Overview of attention for article published in Frontiers in Molecular Biosciences, February 2018
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Title
Relaxase MobM Induces a Molecular Switch at Its Cognate Origin of Transfer
Published in
Frontiers in Molecular Biosciences, February 2018
DOI 10.3389/fmolb.2018.00017
Pubmed ID
Authors

Fabián Lorenzo-Díaz, Cris Fernández-López, Beatriz Guillén-Guío, Alicia Bravo, Manuel Espinosa

Abstract

The MOBV1 family of relaxases is broadly distributed in plasmids and other mobile genetic elements isolated from staphylococci, enterococci, and streptococci. The prototype of this family is protein MobM encoded by the streptococcal promiscuous plasmid pMV158. MobM cleaves the phosphodiester bond of a specific dinucleotide within the origin of transfer (oriT) to initiate conjugative transfer. Differently from other relaxases, MobM and probably other members of the family, cleaves its target single-stranded DNA through a histidine residue rather than the commonly used tyrosine. The oriT of the MOBV1 family differs from other well-known conjugative systems since it has sequences with three inverted repeats, which were predicted to generate three mutually-exclusive hairpins on supercoiled DNA. In this work, such hypothesis was evaluated through footprinting experiments on supercoiled plasmid DNA. We have found a change in hairpin extrusion mediated by protein MobM. This conformational change involves a shift from the main hairpin generated on "naked" DNA to a different hairpin in which the nick site is positioned in a single-stranded configuration. Our results indicate that the oriTpMV158 acts as a molecular switch in which, depending on the inverted repeat recognized by MobM, pMV158 mobilization could be turned "on" or "off."

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Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 13 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 13 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 3 23%
Student > Master 2 15%
Professor 2 15%
Librarian 1 8%
Student > Bachelor 1 8%
Other 1 8%
Unknown 3 23%
Readers by discipline Count As %
Biochemistry, Genetics and Molecular Biology 4 31%
Agricultural and Biological Sciences 3 23%
Nursing and Health Professions 1 8%
Immunology and Microbiology 1 8%
Engineering 1 8%
Other 0 0%
Unknown 3 23%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 26 February 2018.
All research outputs
#18,589,103
of 23,025,074 outputs
Outputs from Frontiers in Molecular Biosciences
#1,987
of 3,873 outputs
Outputs of similar age
#256,746
of 330,211 outputs
Outputs of similar age from Frontiers in Molecular Biosciences
#30
of 41 outputs
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