Download MendeleyThe crystal structure of an alternating RNA heptamer r(GUAUACA) forming a six base-paired duplex with 3'-end adenine overhangs
Shi, K., Pan, B., Sundaralingam, M.(2003) Nucleic Acids Res 31: 1392-1397
- PubMed: 12595546 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1093/nar/gkg226
- Primary Citation Related Structures:
1L3Z - PubMed Abstract:
The crystal structure of an alternating RNA heptamer r(GUAUACA) has been determined to 2.0 A resolution and refined to an R(work) of 17.1% and R(free) of 18.5% using 2797 reflections. The heptamer crystallized in the space group C222 with a unit cell of a = 25.74, b = 106.58, c = 30.26 A and two independent strands in the asymmetric unit. Each heptamer forms a duplex with its symmetry-related strand and each duplex contains six Watson-Crick base pairs and 3'-end adenosine overhangs. Therefore, two kinds of duplex (duplex 1 and duplex 2) are formed. Duplexes 1 stack on each other forming a pseudo-continuous column, which is typical of the RNA packing mode, while duplex 2 is typical of A-DNA packing with its termini in abutting interactions. Overhang adenine residues stack within the duplexes with C3'-endo sugar pucker and C2'-endo sugar pucker in duplexes 1 and 2, respectively. A Na+ ion in the crystal lattice is water bridged to two N1 atoms of symmetry-related A7 bases.
- Department of Chemistry, The Ohio State University, 200 Johnston Laboratory, Columbus, OH 43210, USA.
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