Modulation of Ultrafast Conformational Dynamics in Allosteric Interaction of Gal Repressor Protein with Different Operator DNA Sequences

ChemBioChem ◽  
2016 ◽  
Vol 17 (7) ◽  
pp. 605-613 ◽  
Author(s):  
Susobhan Choudhury ◽  
Gitashri Naiya ◽  
Priya Singh ◽  
Peter Lemmens ◽  
Siddhartha Roy ◽  
...  
Keyword(s):  
Dna Sequences ◽  
Conformational Dynamics ◽  
Repressor Protein ◽  
Allosteric Interaction ◽  
Operator Dna

scholarly journals Inside Cover: Modulation of Ultrafast Conformational Dynamics in Allosteric Interaction of Gal Repressor Protein with Different Operator DNA Sequences (ChemBioChem 7/2016)

ChemBioChem ◽  
2016 ◽  
Vol 17 (7) ◽  
pp. 524-524
Author(s):  
Susobhan Choudhury ◽  
Gitashri Naiya ◽  
Priya Singh ◽  
Peter Lemmens ◽  
Siddhartha Roy ◽  
...  
Keyword(s):  
Dna Sequences ◽  
Conformational Dynamics ◽  
Repressor Protein ◽  
Allosteric Interaction ◽  
Operator Dna

Interaction of the λ-cro repressor protein with operator DNA fragments monitored as to amide proton magnetic resonances

1991 ◽  
Vol 242 ◽  
pp. 355-366 ◽  
Author(s):  
Masahiro Shirakawa ◽  
Sang Jong Lee ◽  
Misato Takimoto ◽  
Hiroshi Matsuo ◽  
Hideo Akutsu ◽  
...  
Keyword(s):  
Amide Proton ◽  
Dna Fragments ◽  
Repressor Protein ◽  
Cro Repressor ◽  
Operator Dna ◽  
Magnetic Resonances

scholarly journals DNA sequence is a major determinant of tetrasome dynamics

2019 ◽  
Author(s):  
O. Ordu ◽  
A. Lusser ◽  
N. H. Dekker
Keyword(s):  
Dna Sequence ◽  
Dna Sequences ◽  
Dynamic Properties ◽  
Conformational Dynamics ◽  
Magnetic Tweezers ◽  
Torsional Stress ◽  
High Affinity ◽  
Canonical State ◽  
Left And Right ◽  
Dna Wrapping

ABSTRACTEukaryotic genomes are hierarchically organized into protein-DNA assemblies for compaction into the nucleus. Nucleosomes, with the (H3-H4)2 tetrasome as a likely intermediate, are highly dynamic in nature by way of several different mechanisms. We have recently shown that tetrasomes spontaneously change the direction of their DNA wrapping between left- and right-handed conformations, which may prevent torque build-up in chromatin during active transcription or replication. DNA sequence has been shown to strongly affect nucleosome positioning throughout chromatin. It is not known, however, whether DNA sequence also impacts the dynamic properties of tetrasomes. To address this question, we examined tetrasomes assembled on a high-affinity DNA sequence using freely orbiting magnetic tweezers. In this context, we also studied the effects of mono- and divalent salts on the flipping dynamics. We found that neither DNA sequence nor altered buffer conditions affect overall tetrasome structure. In contrast, tetrasomes bound to high-affinity DNA sequences showed significantly altered flipping kinetics, predominantly via a reduction in the lifetime of the canonical state of left-handed wrapping. Increased mono- and divalent salt concentrations counteracted this behaviour. Thus, our study indicates that high-affinity DNA sequences impact not only the positioning of the nucleosome, but that they also endow the subnucleosomal tetrasome with enhanced conformational plasticity. This may provide a means to prevent histone loss upon exposure to torsional stress, thereby contributing to the integrity of chromatin at high-affinity sites.STATEMENT OF SIGNIFICANCECanonical (H3-H4)2 tetrasomes possess high conformational flexibility, as evidenced by their spontaneous flipping between states of left- and right-handed DNA wrapping. Here, we show that these conformational dynamics of tetrasomes cannot be described by a fixed set of rates over all conditions. Instead, an accurate description of their behavior must take into account details of their loading, in particular the underlying DNA sequence. In vivo, differences in tetrasome flexibility could be regulated by modifications of the histone core or the tetrasomal DNA, and as such constitute an intriguing, potentially adjustable mechanism for chromatin to accommodate the torsional stress generated by processes such as transcription and replication.

SYNTHESIS OF LAC AND λ OPERATOR DNA SEQUENCES

1976 ◽  
pp. 159-164
Author(s):  
D.V. Goeddel ◽  
D.G. Yansura ◽  
E. Kawashima ◽  
T. Gadek ◽  
M.H. Caruthers
Keyword(s):  
Dna Sequences ◽  
Operator Dna

Early Events in the Binding of the pPS10 Replication Protein RepA to Single Iteron and Operator DNA Sequences

2006 ◽  
Vol 364 (5) ◽  
pp. 909-920 ◽  
Author(s):  
Teresa Díaz-López ◽  
Cristina Dávila-Fajardo ◽  
Franca Blaesing ◽  
M. Pilar Lillo ◽  
Rafael Giraldo
Keyword(s):  
Dna Sequences ◽  
Replication Protein ◽  
Operator Dna

scholarly journals The allosteric interaction between D-galactose and the Escherichia coli galactose repressor protein.

1994 ◽  
Vol 269 (17) ◽  
pp. 12600-12605
Author(s):  
M.P. Brown ◽  
N. Shaikh ◽  
M. Brenowitz ◽  
L. Brand
Keyword(s):  
Escherichia Coli ◽  
Repressor Protein ◽  
Allosteric Interaction
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