title: First look at RNA in L-configuration.
abstract: Nucleic acid molecules in the mirror image or L-configuration are unknown in nature and are extraordinarily resistant to biological degradation. The identification of functional L-oligonucleotides called Spiegelmers offers a novel approach for drug discovery based on RNA. The sequence r(CUGGGCGG).r(CCGCCUGG) was chosen as a model system for structural analysis of helices in the L-configuration as the structure of the D-form of this sequence has previously been determined in structural studies of 5S RNA domains, in particular domain E of the Thermus flavus 5S rRNA [Perbandt et al. (2001), Acta Cryst. D57, 219-224]. Unexpectedly, the results of crystallization trials showed little similarity between the D- and the L-forms of the duplex in either the crystallization hits or the diffraction performance. The crystal structure of this L-RNA duplex has been determined at 1.9 A resolution with R(work) and R(free) of 23.8 and 28.6%, respectively. The crystals belong to space group R32, with unit-cell parameters a = 45.7, c = 264.6 A. Although there are two molecules in the asymmetric unit rather than one, the structure of the L-form arranges helical pairs in a head-to-tail fashion to form pseudo-continuous infinite helices in the crystal as in the D-form. On the other hand, the wobble-like G.C(+) base pair seen in the D-RNA analogue does not appear in the L-RNA duplex, which forms a regular double-helical structure with typical Watson-Crick base pairing.
authors.affiliation: Institutes of Biology, Chemistry and Pharmacy, Free University of Berlin, Biochemistry: Thielallee 63, 14195 Berlin, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Vallazza
authors.forename: M
authors.initials: M
authors.lastname: Perbandt
authors.forename: S
authors.initials: S
authors.lastname: Klussmann
authors.forename: W
authors.initials: W
authors.lastname: Rypniewski
authors.forename: H M
authors.initials: HM
authors.lastname: Einspahr
authors.forename: V A
authors.initials: VA
authors.lastname: Erdmann
authors.forename: Ch
authors.initials: Ch
authors.lastname: Betzel
mesh_terms: D020029:Base Pairing; D003460:Crystallization; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D009690:Nucleic Acid Conformation; D012313:RNA / Q000737:chemistry*; D012329:RNA, Bacterial / Q000737:chemistry; D012341:RNA, Ribosomal, 5S / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D012329:RNA, Bacterial; D012341:RNA, Ribosomal, 5S; D012313:RNA