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  4. Spatial organization of DNA sequences directs the assembly of bacterial chromatin by a nucleoid-associated protein
 
research article

Spatial organization of DNA sequences directs the assembly of bacterial chromatin by a nucleoid-associated protein

Japaridze, Aleksandre  
•
Renevey, Sylvain
•
Sobetzko, Patrick
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2017
Journal of Biological Chemistry

Structural differentiation of bacterial chromatin depends on cooperative binding of abundant nucleoid-associated proteins at numerous genomic DNA sites and stabilization of distinct long-range nucleoprotein structures. Histone-like nucleoid-structuring protein (H-NS) is an abundant DNA-bridging, nucleoid-associated protein that binds to an AT-rich conserved DNA sequence motif and regulates both the shape and the genetic expression of the bacterial chromosome. Although there is ample evidence that the mode of H-NS binding depends on environmental conditions, the role of the spatial organization of H-NS-binding sequences in the assembly of long-range nucleoprotein structures remains unknown. In this study, by using high-resolution atomic force microscopy combined with biochemical assays, we explored the formation of H-NS nucleoprotein complexes on circular DNA molecules having different arrangements of identical sequences containing high-affinity H-NS-binding sites. We provide the first experimental evidence that variable sequence arrangements result in various three-dimensional nucleoprotein structures that differ in their shape and the capacity to constrain supercoils and compact the DNA. We believe that the DNA sequence-directed versatile assembly of periodic higher-order structures reveals a general organizational principle that can be exploited for knowledge-based design of long-range nucleoprotein complexes and purposeful manipulation of the bacterial chromatin architecture.

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Type
research article
DOI
10.1074/jbc.M117.780239
Web of Science ID

WOS:000400761300028

Author(s)
Japaridze, Aleksandre  
Renevey, Sylvain
Sobetzko, Patrick
Stoliar, Liubov
Nasser, William
Dietler, Giovanni  
Muskhelishvili, Georgi
Date Issued

2017

Publisher

American Society for Biochemistry & Molecular Biology (ASBMB)

Published in
Journal of Biological Chemistry
Volume

292

Issue

18

Start page

7607

End page

7618

Subjects

atomic force microscopy (AFM)

•

bacterial genetics

•

DNA binding protein

•

DNA topology

•

protein-DNA interaction

•

DNA binding sites

•

bacterial chromatin

•

nucleoid-associated protein H-NS

•

nucleoprotein filaments

Note

This article is licensed under a Creative Commons Attribution 4.0 International License

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPMV  
Available on Infoscience
July 10, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/139109
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