1zyg

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[[Image:1zyg.gif|left|200px]]
[[Image:1zyg.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 1zyg |SIZE=350|CAPTION= <scene name='initialview01'>1zyg</scene>
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The line below this paragraph, containing "STRUCTURE_1zyg", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=DA:2&#39;-DEOXYADENOSINE-5&#39;-MONOPHOSPHATE'>DA</scene>, <scene name='pdbligand=DC:2&#39;-DEOXYCYTIDINE-5&#39;-MONOPHOSPHATE'>DC</scene>, <scene name='pdbligand=DG:2&#39;-DEOXYGUANOSINE-5&#39;-MONOPHOSPHATE'>DG</scene>, <scene name='pdbligand=DT:THYMIDINE-5&#39;-MONOPHOSPHATE'>DT</scene>
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|GENE=
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|DOMAIN=
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{{STRUCTURE_1zyg| PDB=1zyg | SCENE= }}
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|RELATEDENTRY=[[1zyf|1ZYF]], [[1zyh|1ZYH]]
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1zyg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zyg OCA], [http://www.ebi.ac.uk/pdbsum/1zyg PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1zyg RCSB]</span>
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'''Structure of a Supercoiling Responsive DNA Site'''
'''Structure of a Supercoiling Responsive DNA Site'''
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==About this Structure==
==About this Structure==
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1ZYG is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZYG OCA].
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZYG OCA].
==Reference==
==Reference==
Structural and dynamic basis of a supercoiling-responsive DNA element., Bae SH, Yun SH, Sun D, Lim HM, Choi BS, Nucleic Acids Res. 2006 Jan 9;34(1):254-61. Print 2006. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16414956 16414956]
Structural and dynamic basis of a supercoiling-responsive DNA element., Bae SH, Yun SH, Sun D, Lim HM, Choi BS, Nucleic Acids Res. 2006 Jan 9;34(1):254-61. Print 2006. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16414956 16414956]
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[[Category: Protein complex]]
 
[[Category: Bae, S H.]]
[[Category: Bae, S H.]]
[[Category: Choi, B S.]]
[[Category: Choi, B S.]]
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[[Category: Sun, D.]]
[[Category: Sun, D.]]
[[Category: Yun, S H.]]
[[Category: Yun, S H.]]
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[[Category: dna]]
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[[Category: Dna]]
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[[Category: hin]]
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[[Category: Hin]]
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[[Category: hix]]
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[[Category: Hix]]
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[[Category: recombinase]]
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[[Category: Recombinase]]
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[[Category: supercoiling]]
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[[Category: Supercoiling]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 18:14:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 01:43:17 2008''
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Revision as of 15:14, 3 May 2008

Image:1zyg.gif

Template:STRUCTURE 1zyg

Structure of a Supercoiling Responsive DNA Site


Overview

In both eukaryotes and prokaryotes, negative supercoiling of chromosomal DNA acts locally to regulate a variety of cellular processes, such as transcription, replication, recombination and response to environmental stresses. While studying the interaction between the Hin recombinase and mutated versions of its cognate DNA-binding site, we identified a mutated DNA site that binds Hin only when the DNA is supercoiled. To understand the mechanism of this supercoiling-responsive DNA site, we used NMR spectroscopy and fluorescence resonance energy transfer to determine the solution structures and dynamics of three related DNA oligonucleotides. The supercoiling-responsive DNA site formed a partially unwound and stretched helix and showed significant flexibility and base pair opening kinetics. The single CAG/CTG triplet contained in this DNA sequence displayed the same characteristics as do multiple CAG/CTG repeats, which are associated with several hereditary neuromuscular diseases. It is known that short DNA sequence motifs that have either very high or low bending flexibility occur preferentially at supercoiling-sensitive bacterial and eukaryotic promoters. From our results and these previous data, we propose a model in which supercoiling utilizes the intrinsic flexibility of a short DNA site to switch the local DNA structure from an inefficient conformation for protein binding to an efficient one, or vice versa.

About this Structure

Full crystallographic information is available from OCA.

Reference

Structural and dynamic basis of a supercoiling-responsive DNA element., Bae SH, Yun SH, Sun D, Lim HM, Choi BS, Nucleic Acids Res. 2006 Jan 9;34(1):254-61. Print 2006. PMID:16414956 Page seeded by OCA on Sat May 3 18:14:14 2008

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