225d: Difference between revisions
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[[Image:225d.jpg|left|200px]] | [[Image:225d.jpg|left|200px]] | ||
'''A TETRAMERIC DNA STRUCTURE WITH PROTONATED CYTOSINE:CYTOSINE BASE PAIRS''' | {{Structure | ||
|PDB= 225d |SIZE=350|CAPTION= <scene name='initialview01'>225d</scene> | |||
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'''A TETRAMERIC DNA STRUCTURE WITH PROTONATED CYTOSINE:CYTOSINE BASE PAIRS''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
225D is a [ | 225D 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=225D OCA]. | ||
==Reference== | ==Reference== | ||
A tetrameric DNA structure with protonated cytosine.cytosine base pairs., Gehring K, Leroy JL, Gueron M, Nature. 1993 Jun 10;363(6429):561-5. PMID:[http:// | A tetrameric DNA structure with protonated cytosine.cytosine base pairs., Gehring K, Leroy JL, Gueron M, Nature. 1993 Jun 10;363(6429):561-5. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8389423 8389423] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Gehring, K.]] | [[Category: Gehring, K.]] | ||
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[[Category: nmr]] | [[Category: nmr]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 15:42:29 2008'' | ||
Revision as of 13:42, 20 March 2008
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| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
A TETRAMERIC DNA STRUCTURE WITH PROTONATED CYTOSINE:CYTOSINE BASE PAIRS
Overview
Oligomers containing tracts of cytidine form hemiprotonated base pairs at acid pH and have been considered to be double-stranded. We have solved the structure of the DNA oligomer 5'-d(TCCCCC) at acid pH and find that it is a four-stranded complex in which two base-paired parallel-stranded duplexes are intimately associated, with their base pairs fully intercalated. The relative orientation of the duplexes is antiparallel, so that each base pair is face-to-face with its neighbours. The NMR spectrum displays only six spin systems, showing that the structure is highly symmetrical on the NMR timescale; the four strands are equivalent. A model derived by energy minimization and constrained molecular dynamics shows excellent compatibility with the observed nuclear Overhauser effects (NOEs) particularly for the very unusual inter-residue sugar-sugar NOEs H1'-H1', H1'-H2" and H1'-H4'. These NOEs are probably diagnostic for such tetrameric structures.
About this Structure
225D is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
A tetrameric DNA structure with protonated cytosine.cytosine base pairs., Gehring K, Leroy JL, Gueron M, Nature. 1993 Jun 10;363(6429):561-5. PMID:8389423
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