2ana
From Proteopedia
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|PDB= 2ana |SIZE=350|CAPTION= <scene name='initialview01'>2ana</scene>, resolution 2.500Å | |PDB= 2ana |SIZE=350|CAPTION= <scene name='initialview01'>2ana</scene>, resolution 2.500Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= | + | |LIGAND= <scene name='pdbligand=DC:2'-DEOXYCYTIDINE-5'-MONOPHOSPHATE'>DC</scene>, <scene name='pdbligand=DG:2'-DEOXYGUANOSINE-5'-MONOPHOSPHATE'>DG</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ana FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ana OCA], [http://www.ebi.ac.uk/pdbsum/2ana PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2ana RCSB]</span> | ||
}} | }} | ||
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[[Category: double helix]] | [[Category: double helix]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 01:54:53 2008'' |
Revision as of 22:54, 30 March 2008
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| , resolution 2.500Å | |||||||
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| Ligands: | , | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
THE CRYSTAL STRUCTURE OF D(G-G-G-G-C-C-C-C). A MODEL FOR POLY(DG).POLY(DC)
Overview
The structure of the DNA oligomer d(G-G-G-G-C-C-C-C) has been determined at a resolution of 2.5 A by single-crystal X-ray methods. There are two strands in the asymmetric unit, and these coil about each other to form a right-handed double-helix of the A-type with Watson-Crick hydrogen bonds between base-pairs. The helix has a shallow minor groove and a deep, water-filled major groove; almost all exposed functional groups on the DNA are hydrated, and 106 ordered solvent molecules have been found. The two d(G-G-G-G).d(C-C-C-C) segments in the octamer exhibit similar and uniform structures, but there is a slight discontinuity at the GpC step between them. A recurring feature of the structure is the overlap of adjacent guanine bases in each GpG step, with the five-membered ring of one guanine stacking on the six-membered ring of its neighbour. There is little or no overlap between adjacent cytosine rings. Conformational parameters for these GpG steps are compared with those from other single-crystal X-ray analyses. In general, GpG steps exhibit high slide, low roll and variable twist. Models for poly(dG).poly(dC) were generated by applying a simple rotation and translation to each of the unmodified d(G-G-G-G).d(C-C-C-C) units. Detailed features of these models are shown to be compatible with various assays of poly(dG).poly(dC) in solution, and are useful in understanding the polymorphic behaviour of this sequence under a variety of experimental conditions.
About this Structure
2ANA is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
The crystal structure of d(G-G-G-G-C-C-C-C). A model for poly(dG).poly(dC)., McCall M, Brown T, Kennard O, J Mol Biol. 1985 Jun 5;183(3):385-96. PMID:4020865
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