2bna
From Proteopedia
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| - | [[Image:2bna.jpg|left|200px]] | + | [[Image:2bna.jpg|left|200px]] |
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| - | '''STRUCTURE OF A B-DNA DODECAMER AT 16 KELVIN''' | + | {{Structure |
| + | |PDB= 2bna |SIZE=350|CAPTION= <scene name='initialview01'>2bna</scene>, resolution 2.700Å | ||
| + | |SITE= | ||
| + | |LIGAND= | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
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| + | '''STRUCTURE OF A B-DNA DODECAMER AT 16 KELVIN''' | ||
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==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2BNA is a [ | + | 2BNA 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=2BNA OCA]. |
==Reference== | ==Reference== | ||
| - | Structure of a B-DNA dodecamer at 16 K., Drew HR, Samson S, Dickerson RE, Proc Natl Acad Sci U S A. 1982 Jul;79(13):4040-4. PMID:[http:// | + | Structure of a B-DNA dodecamer at 16 K., Drew HR, Samson S, Dickerson RE, Proc Natl Acad Sci U S A. 1982 Jul;79(13):4040-4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/6955789 6955789] |
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Dickerson, R E.]] | [[Category: Dickerson, R E.]] | ||
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[[Category: double helix]] | [[Category: double helix]] | ||
| - | ''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 16:04:11 2008'' |
Revision as of 14:04, 20 March 2008
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| , resolution 2.700Å | |||||||
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| Coordinates: | save as pdb, mmCIF, xml | ||||||
STRUCTURE OF A B-DNA DODECAMER AT 16 KELVIN
Overview
The crystal structure of the B-DNA dodecamer C-G-C-G-A-A-T-T-C-G-C-G, previously solved and refined at room temperature (290 K), has been analyzed at 16 K (-257 degrees C). The end-to-end winding of the helix does not vary with temperature but remains constant at 10.1 base pairs per turn. Negatively charged phosphate groups throughout the structure do move closer together on cooling, however, probably because of increase in the dielectric constant of water as the temperature is lowered. This has the two-fold effect of reducing the spacing between neighboring double helices from 24.0 to 22.9 A and of narrowing the helix grooves within any isolated molecule. Overall lattice displacements as deduced from crystallographic temperature factors are very much decreased in the 16 K structure, yet displacements at phosphates continue to exceed those of deoxyribose sugars by B = 9 A2 and those of base pairs by B = 22 A2, even at this very low temperature at which practically all thermal motion has been eliminated. These differences, formerly interpreted as evidence for thermal vibration, must now be attributed to static disorder.
About this Structure
2BNA is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
Structure of a B-DNA dodecamer at 16 K., Drew HR, Samson S, Dickerson RE, Proc Natl Acad Sci U S A. 1982 Jul;79(13):4040-4. PMID:6955789
Page seeded by OCA on Thu Mar 20 16:04:11 2008
