Download MendeleyStructure of a B-form DNA/RNA chimera (dC)(rG)d(ATCG) complexed with daunomycin at 1.5 A resolution.
Shi, K., Pan, B., Sundaralingam, M.(2003) Acta Crystallogr D Biol Crystallogr 59: 1377-1383
- PubMed: 12876339 Search on PubMed
- DOI: https://doi.org/10.1107/s0907444903011788
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1JO2 - PubMed Abstract:
The crystal structure of a DNA/RNA chimera (dC)(rG)d(ATCG) complexed with the anticancer drug daunomycin has been determined at 1.5 A resolution with R(work) and R(free) of 19.7 and 23.3%, respectively, for 2767 reflections. The complex crystallizes in space group P4(1)2(1)2, with unit-cell parameters a = b = 28.05, c = 53.16 A, and contains one nucleic acid strand and one daunomycin molecule in the asymmetric unit. To our knowledge, this is the first crystal structure of a DNA/RNA chimera complexed with an intercalating drug. The DNA/RNA chimera adopts the B-form helical conformation, with the 2'-hydroxyl group in the major groove of the duplex, forming hydrogen bonds to N7 and the anionic phosphate oxygen of its 3'-side adenine. The present results indicate that the replacement by the ribose sugar in the DNA sequence does not change the geometry and intercalation pattern of daunomycin. A model of B-form RNA has been built based on the present structure. The model indicates that the interactions of the 2'-hydroxyl groups in the B-form duplex depend on their 3'-side nucleotides.
- Departments of Chemistry and Biochemistry, The Ohio State University, 200 Johnston Laboratory, 176 West 19th Avenue, Columbus, OH 43210, USA.
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