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'''Crystal structure of an RNA racemate''' | '''Crystal structure of an RNA racemate''' | ||
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==About this Structure== | ==About this Structure== | ||
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GQ7 OCA]. | |||
==Reference== | ==Reference== | ||
The first crystal structure of an RNA racemate., Rypniewski W, Vallazza M, Perbandt M, Klussmann S, Delucas LJ, Betzel C, Erdmann VA, Acta Crystallogr D Biol Crystallogr. 2006 Jun;62(Pt 6):659-64. Epub 2006, May 12. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16699193 16699193] | The first crystal structure of an RNA racemate., Rypniewski W, Vallazza M, Perbandt M, Klussmann S, Delucas LJ, Betzel C, Erdmann VA, Acta Crystallogr D Biol Crystallogr. 2006 Jun;62(Pt 6):659-64. Epub 2006, May 12. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16699193 16699193] | ||
[[Category: Betzel, C.]] | [[Category: Betzel, C.]] | ||
[[Category: Erdmann, V A.]] | [[Category: Erdmann, V A.]] | ||
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[[Category: Rypniewski, W.]] | [[Category: Rypniewski, W.]] | ||
[[Category: Vallazza, M.]] | [[Category: Vallazza, M.]] | ||
[[Category: | [[Category: Double helix]] | ||
[[Category: | [[Category: Racemate]] | ||
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Revision as of 05:23, 4 May 2008
Crystal structure of an RNA racemate
OverviewOverview
The racemate of the RNA duplex r(CUGGGCGG).r(CCGCCUGG) from Thermus flavus 5S rRNA has been crystallized and examined by X-ray crystallography. The space group is P1(_) with approximate unit-cell parameters a = 26.5, b = 38.0, c = 45.4 Angstrom, alpha = 113.1, beta = 100.5, gamma = 93.3 degrees. The structure was solved by molecular replacement. There are four RNA duplexes in the unit cell. The crystal lattice consists of columns of RNA duplexes. The duplexes are stacked end-to-end and are stabilized by intermolecular base-stacking interactions. Within each column the L-duplexes and D-duplexes are stacked alternately. Every other duplex in each stack has two alternative conformations, approximately equally occupied, corresponding to molecules oriented in opposite directions. Neighbouring columns are related by the crystallographic centre of symmetry. The unit cell also contains approximately 250 ordered water molecules and six ordered calcium ions. A glycerol molecule is visible in the minor groove interacting with a guanosine residue.
About this StructureAbout this Structure
Full crystallographic information is available from OCA.
ReferenceReference
The first crystal structure of an RNA racemate., Rypniewski W, Vallazza M, Perbandt M, Klussmann S, Delucas LJ, Betzel C, Erdmann VA, Acta Crystallogr D Biol Crystallogr. 2006 Jun;62(Pt 6):659-64. Epub 2006, May 12. PMID:16699193 Page seeded by OCA on Sun May 4 05:23:45 2008