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H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition

Tn10/IS10 transposition takes place in the context of a protein–DNA complex called a transpososome. During the reaction, the transpososome undergoes several conformational changes. The host proteins IHF and H-NS, which also are global regulators of gene expression, play important roles in directing...

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Detalles Bibliográficos
Autores principales: Liu, Danxu, Haniford, David B., Chalmers, Ronald M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159471/
https://www.ncbi.nlm.nih.gov/pubmed/21565798
http://dx.doi.org/10.1093/nar/gkr309
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author Liu, Danxu
Haniford, David B.
Chalmers, Ronald M.
author_facet Liu, Danxu
Haniford, David B.
Chalmers, Ronald M.
author_sort Liu, Danxu
collection PubMed
description Tn10/IS10 transposition takes place in the context of a protein–DNA complex called a transpososome. During the reaction, the transpososome undergoes several conformational changes. The host proteins IHF and H-NS, which also are global regulators of gene expression, play important roles in directing these architectural changes. IHF binds tightly to only one of two transposon ends within the transpososome, folding this end into a DNA loop structure. Unfolding this DNA loop is necessary for excising the transposon from flanking donor DNA and preventing integration of the transposon into itself. We show here that efficient DNA loop unfolding relies on the continuity of the flanking donor DNA on the side of the transpososome opposite to the folded transposon end. We also show this same donor DNA is a preferred binding site for H-NS, which promotes opening of the IHF-loop, which is required for productive target interactions. This is counter to the usual mode of H-NS action, which is repressive due to its propensity to coat DNA. The interplay between IHF and H-NS likely serves to couple the rate of transposition to the host cell physiology as both of these proteins are integrated into cellular stress response pathways.
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spelling pubmed-31594712011-08-22 H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition Liu, Danxu Haniford, David B. Chalmers, Ronald M. Nucleic Acids Res Nucleic Acid Enzymes Tn10/IS10 transposition takes place in the context of a protein–DNA complex called a transpososome. During the reaction, the transpososome undergoes several conformational changes. The host proteins IHF and H-NS, which also are global regulators of gene expression, play important roles in directing these architectural changes. IHF binds tightly to only one of two transposon ends within the transpososome, folding this end into a DNA loop structure. Unfolding this DNA loop is necessary for excising the transposon from flanking donor DNA and preventing integration of the transposon into itself. We show here that efficient DNA loop unfolding relies on the continuity of the flanking donor DNA on the side of the transpososome opposite to the folded transposon end. We also show this same donor DNA is a preferred binding site for H-NS, which promotes opening of the IHF-loop, which is required for productive target interactions. This is counter to the usual mode of H-NS action, which is repressive due to its propensity to coat DNA. The interplay between IHF and H-NS likely serves to couple the rate of transposition to the host cell physiology as both of these proteins are integrated into cellular stress response pathways. Oxford University Press 2011-08 2011-05-11 /pmc/articles/PMC3159471/ /pubmed/21565798 http://dx.doi.org/10.1093/nar/gkr309 Text en © The Author(s) 2011. Published by Oxford University Press. http://creativecommons.org/licenses/by-nc/3.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Nucleic Acid Enzymes
Liu, Danxu
Haniford, David B.
Chalmers, Ronald M.
H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition
title H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition
title_full H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition
title_fullStr H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition
title_full_unstemmed H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition
title_short H-NS mediates the dissociation of a refractory protein–DNA complex during Tn10/IS10 transposition
title_sort h-ns mediates the dissociation of a refractory protein–dna complex during tn10/is10 transposition
topic Nucleic Acid Enzymes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159471/
https://www.ncbi.nlm.nih.gov/pubmed/21565798
http://dx.doi.org/10.1093/nar/gkr309
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