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1rvi

From Proteopedia

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[[Image:1rvi.jpg|left|200px]]
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{{STRUCTURE_1rvi| PDB=1rvi | SCENE= }}
{{STRUCTURE_1rvi| PDB=1rvi | SCENE= }}
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'''SOLUTION STRUCTURE OF THE DNA DODECAMER CGTTTTAAAACG'''
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===SOLUTION STRUCTURE OF THE DNA DODECAMER CGTTTTAAAACG===
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==Overview==
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DNA A-tracts have been defined as four or more consecutive A.T base pairs without a TpA step. When inserted in phase with the DNA helical repeat, bending is manifested macroscopically as anomalous migration on polyacrylamide gels, first observed &gt;20 years ago. An unsolved conundrum is why DNA containing in-phase A-tract repeats of A(4)T(4) are bent, whereas T(4)A(4) is straight. We have determined the solution structures of the DNA duplexes formed by d(GCAAAATTTTGC) [A4T4] and d(CGTTTTAAAACG) [T4A4] with NH(4)(+) counterions by using NMR spectroscopy, including refinement with residual dipolar couplings. Analysis of the structures shows that the ApT step has a large negative roll, resulting in a local bend toward the minor groove, whereas the TpA step has a positive roll and locally bends toward the major groove. For A4T4, this bend is nearly in phase with bends at the two A-tract junctions, resulting in an overall bend toward the minor groove of the A-tract, whereas for T4A4, the bends oppose each other, resulting in a relatively straight helix. NMR-based structural modeling of d(CAAAATTTTG)(15) and d(GTTTTAAAAC)(15) reveals that the former forms a left-handed superhelix with a diameter of approximately 110 A and pitch of 80 A, similar to DNA in the nucleosome, whereas the latter has a gentle writhe with a pitch of &gt;250 A and diameter of approximately 50 A. Results of gel electrophoretic mobility studies are consistent with the higher-order structure of the DNA and furthermore depend on the nature of the monovalent cation present in the running buffer.
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(as it appears on PubMed at http://www.pubmed.gov), where 14739342 is the PubMed ID number.
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{{ABSTRACT_PUBMED_14739342}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RVI OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RVI OCA].
==Reference==
==Reference==
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[[Category: Wu, H.]]
[[Category: Wu, H.]]
[[Category: Double helix]]
[[Category: Double helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:57:34 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:37:56 2008''

Revision as of 16:37, 27 July 2008

Image:1rvi.png

Template:STRUCTURE 1rvi

SOLUTION STRUCTURE OF THE DNA DODECAMER CGTTTTAAAACG

Template:ABSTRACT PUBMED 14739342

About this Structure

Full experimental information is available from OCA.

Reference

DNA A-tract bending in three dimensions: solving the dA4T4 vs. dT4A4 conundrum., Stefl R, Wu H, Ravindranathan S, Sklenar V, Feigon J, Proc Natl Acad Sci U S A. 2004 Feb 3;101(5):1177-82. Epub 2004 Jan 22. PMID:14739342

Page seeded by OCA on Sun Jul 27 19:37:56 2008

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