research papers
The structures of the complexes formed between two anticancer minor-groove-binding quinolinium quaternary salts and the dodecamer d(CGCGAATTCGCG)2 have been refined to resolutions of 1.6 and 1.8 Å. The complexes crystallized in space group P212121 and the structures are isomorphous with previously solved dodecamer structures. The ligands both bind in the central AT region of the minor groove and although the crystallization conditions and structures of the ligands are very similar, they bind in opposing orientations. The structures are compared with two previously published structures of quinolinium quaternary salts, refined at 2.5 Å resolution, complexed with d(CGCGAATTCGCG)2 and an e6G-modified DNA.
Supporting information
PDB references: SN8315–d(CGCGAATTCGCG)2, 1zph, r1zphsf; SN8224–d(CGCGAATTCGCG)2, 1zpi, r1zpisf