389d

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[[Image:389d.gif|left|200px]]
[[Image:389d.gif|left|200px]]
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{{Structure
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|PDB= 389d |SIZE=350|CAPTION= <scene name='initialview01'>389d</scene>, resolution 1.550&Aring;
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The line below this paragraph, containing "STRUCTURE_389d", creates the "Structure Box" on the page.
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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>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TAF:2&#39;-DEOXY-2&#39;-FLUORO-ARABINO-FURANOSYL+THYMINE-5&#39;-PHOSPHATE'>TAF</scene>
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{{STRUCTURE_389d| PDB=389d | SCENE= }}
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=389d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=389d OCA], [http://www.ebi.ac.uk/pdbsum/389d PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=389d RCSB]</span>
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'''CRYSTAL STRUCTURE OF B-DNA WITH INCORPORATED 2'-DEOXY-2'-FLUORO-ARABINO-FURANOSYL THYMINES: IMPLICATIONS OF CONFORMATIONAL PREORGANIZATION FOR DUPLEX STABILITY'''
'''CRYSTAL STRUCTURE OF B-DNA WITH INCORPORATED 2'-DEOXY-2'-FLUORO-ARABINO-FURANOSYL THYMINES: IMPLICATIONS OF CONFORMATIONAL PREORGANIZATION FOR DUPLEX STABILITY'''
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==About this Structure==
==About this Structure==
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389D 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=389D OCA].
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=389D OCA].
==Reference==
==Reference==
Crystal structures of B-DNA with incorporated 2'-deoxy-2'-fluoro-arabino-furanosyl thymines: implications of conformational preorganization for duplex stability., Berger I, Tereshko V, Ikeda H, Marquez VE, Egli M, Nucleic Acids Res. 1998 May 15;26(10):2473-80. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9580702 9580702]
Crystal structures of B-DNA with incorporated 2'-deoxy-2'-fluoro-arabino-furanosyl thymines: implications of conformational preorganization for duplex stability., Berger I, Tereshko V, Ikeda H, Marquez VE, Egli M, Nucleic Acids Res. 1998 May 15;26(10):2473-80. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9580702 9580702]
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[[Category: Protein complex]]
 
[[Category: Berger, I.]]
[[Category: Berger, I.]]
[[Category: Egli, M.]]
[[Category: Egli, M.]]
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[[Category: Marquez, V E.]]
[[Category: Marquez, V E.]]
[[Category: Tereshko, V.]]
[[Category: Tereshko, V.]]
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[[Category: b-dna]]
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[[Category: B-dna]]
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[[Category: double helix]]
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[[Category: Double helix]]
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[[Category: modified]]
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[[Category: Modified]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 20:18:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 05:22:03 2008''
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Revision as of 17:18, 4 May 2008

Image:389d.gif

Template:STRUCTURE 389d

CRYSTAL STRUCTURE OF B-DNA WITH INCORPORATED 2'-DEOXY-2'-FLUORO-ARABINO-FURANOSYL THYMINES: IMPLICATIONS OF CONFORMATIONAL PREORGANIZATION FOR DUPLEX STABILITY


Overview

The fundamental conformational states of right-handed double helical DNA, the A- and B-forms, are associated with distinct puckers of the sugar moieties. The furanose conformation itself is affected by the steric and electronic nature of the ring substituents. For example, a strongly electronegative substituent at the C2' position, such as in the 2'-deoxy-2'-fluoro ribo furanosyl analogue, will drive the conformational equilibrium towards the C3'- endo type (north). Conversely, the 2'-deoxy-2'-fluoro arabino furanosyl modification with opposite stereochemistry at C2' appears to have a preference for a C2'- endo type pucker (south). Incorporation of 2'-fluoroarabinofuranosyl thymines was previously shown to enhance the thermodynamic stability of B-DNA duplexes. We have determined the crystal structures of the B-DNA dodecamer duplexes [d(CGCGAASSCGCG)]2and [d(CGCGAASTCGCG)]2with incorporated 2'-deoxy-2'-fluoroarabinofuranosyl thymines S (south) at 1.55 A resolution. In the crystal structures, all S residues adopt an O4'- endo conformation (east), well compatible with an overall B-form duplex geometry. In addition to the increased rigidity of S nucleosides, a clathrate-like ordered water structure around the 2'-fluorines may account for the observed larger thermodynamic stability of DNA duplexes containing 2'-deoxy-2'-fluoroarabino thymidines.

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structures of B-DNA with incorporated 2'-deoxy-2'-fluoro-arabino-furanosyl thymines: implications of conformational preorganization for duplex stability., Berger I, Tereshko V, Ikeda H, Marquez VE, Egli M, Nucleic Acids Res. 1998 May 15;26(10):2473-80. PMID:9580702 Page seeded by OCA on Sun May 4 20:18:29 2008

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