title: Structure of d(ITITACAC) complexed with distamycin at 1.6 A resolution.
abstract: The crystal structure of the DNA octamer d(ITITACAC)(2) complexed with distamycin has been determined at 1.6 A resolution and refined to a final R(work) and R(free) of 17.0 and 20.7%, respectively. Two molecules of distamycin bind to the DNA duplex in an antiparallel side-by-side fashion. Each drug molecule covers five base pairs of the DNA duplex, with its amide groups hydrogen-bonding to bases in the proximal DNA strand. These two antiparallel drug molecules are stacked together with the pyrrole rings of one molecule stacking against the amide groups of the other. The present structure emphasizes the features of alternating DNA octamers in interaction with distamycin.
authors.affiliation: Departments of Chemistry and Biochemistry, The Ohio State University, 200 Johnston Laboratory, 176 West 19th Avenue, Columbus, Ohio 43210, USA.
authors.forename: Junpeng
authors.initials: J
authors.lastname: Deng
authors.forename: Baocheng
authors.initials: B
authors.lastname: Pan
authors.forename: Muttaiya
authors.initials: M
authors.lastname: Sundaralingam
mesh_terms: D001483:Base Sequence; D018360:Crystallography, X-Ray; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D004214:Distamycins / Q000737:chemistry* / Q000378:metabolism; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides / Q000737:chemistry* / Q000378:metabolism
chemical_list: D004214:Distamycins; D009838:Oligodeoxyribonucleotides; D004247:DNA