1rrr
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:1rrr.gif|left|200px]] | [[Image:1rrr.gif|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_1rrr", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | | | + | or leave the SCENE parameter empty for the default display. |
| - | | | + | --> |
| - | + | {{STRUCTURE_1rrr| PDB=1rrr | SCENE= }} | |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''RNA DUPLEX CONTAINING A PURINE-RICH STRAND, NMR, 10 STRUCTURES''' | '''RNA DUPLEX CONTAINING A PURINE-RICH STRAND, NMR, 10 STRUCTURES''' | ||
| Line 19: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
| - | + | Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RRR OCA]. | |
==Reference== | ==Reference== | ||
Solution structures of DNA.RNA hybrids with purine-rich and pyrimidine-rich strands: comparison with the homologous DNA and RNA duplexes., Gyi JI, Lane AN, Conn GL, Brown T, Biochemistry. 1998 Jan 6;37(1):73-80. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9425027 9425027] | Solution structures of DNA.RNA hybrids with purine-rich and pyrimidine-rich strands: comparison with the homologous DNA and RNA duplexes., Gyi JI, Lane AN, Conn GL, Brown T, Biochemistry. 1998 Jan 6;37(1):73-80. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9425027 9425027] | ||
| - | [[Category: Protein complex]] | ||
[[Category: Brown, T.]] | [[Category: Brown, T.]] | ||
[[Category: Conn, G L.]] | [[Category: Conn, G L.]] | ||
[[Category: Gyi, J I.]] | [[Category: Gyi, J I.]] | ||
[[Category: Lane, A N.]] | [[Category: Lane, A N.]] | ||
| - | [[Category: | + | [[Category: A-form]] |
| - | [[Category: | + | [[Category: Purine/pyrimidine-rich strand]] |
| - | [[Category: | + | [[Category: Rna duplex]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:50:03 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 04:50, 3 May 2008
RNA DUPLEX CONTAINING A PURINE-RICH STRAND, NMR, 10 STRUCTURES
Overview
The structures of d(GAAGAGAAGC).d(GCTTCTCTTC), d(GAAGAGAAGC). r(GCUUCUCUUC), r(GAAGAGAAGC).d(GCTTCTCTTC), and r(GAAGAGAAGC). r(GCUUCUCUUC) have been determined in solution from NMR data. Globally, the pure DNA and RNA duplexes were in the B and A forms, respectively. The two DNA.RNA hybrids were neither A nor B, but closer globally to the A than the B form. However, the thermodynamically less stable d(GAAGAGAAGC).r(GCUUCUCUUC) duplex has a significantly different conformation from r(GAAGAGAAGC). d(GCTTCTCTTC). Structures were calculated based on the NMR data, using restrained molecular dynamics. A new approach to the treatment of conformational averaging based on a prioriprobabilities has been used. The nucleotides were treated by fitting the scalar coupling data and NOE time courses to a two-state model comprising N and S sugar puckers each with a different glycosidic torsion angle, and the mole fraction of the S state. Restraint sets for different distributions of N and S states within molecules were constructed, such that each nucleotide was weighted in the ensemble according to the mole fractions (or a prioriprobabilities). The individual nucleotide conformations were strongly restrained, whereas the internucleotide restraints were set relatively loosely. Ensembles of conformations were generated and assessed by comparison of the NOEs calculated from ensemble-averaged relaxation matrices with the experimental NOEs. The ensemble averages accounted for the experimental data much better than any individual member, or for structures calculated assuming a single unique conformation. The two hybrids populated different degrees of conformational space. There was a general trend in minor and major groove widths in the order d(GAAGAGAAGC).d(GCTTCTCTTC), d(GAAGAGAAGC).r(GCUUCUCUUC), r(GAAGAGAAGC).d(GCTTCTCTTC), r(GAAGAGAAGC).r(GCUUCUCUUC) and a similar progression in global character from B-like to A-like structures. Furthermore, r(GAAGAGAAGC).d(GCTTCTCTTC) showed a greater dispersion of conformations in the ensemble than d(GAAGAGAAGC).r(GCUUCUCUUC), reflecting the greater flexibility of the sugars. If conformational averaging of the nucleotides is ignored, incorrect virtual structures are produced that nevertheless are able to satisfy a substantial fraction of the experimental data.
About this Structure
Full crystallographic information is available from OCA.
Reference
Solution structures of DNA.RNA hybrids with purine-rich and pyrimidine-rich strands: comparison with the homologous DNA and RNA duplexes., Gyi JI, Lane AN, Conn GL, Brown T, Biochemistry. 1998 Jan 6;37(1):73-80. PMID:9425027 Page seeded by OCA on Sat May 3 07:50:03 2008
