title: Binding of a desmetallo-porphyrin conjugate of Hoechst 33258 to DNA. III. Strong bonding to single-strand oligonucleotides.
abstract: The binding of the conjugate of Hoechst 33258 with 5,10,15,20-tetrakis (1-methyl-4-pyridyl)-21H,23H-porphyrin (PORHOE) to single-strand DNA has been detected by UV-vis spectrophotometry and 1H-NMR. The red-shift of porphyrin Soret band with strong hypochromicity indicates that the porphyrin moiety dominates in the interaction of the PORHOE with ssDNA. The affinity constants of PORHOE for d(GCATACAATTCG) or d(CGAATTGTATGC) were determined to be >10(5) M(-1), with strong cooperativity.
authors: School of Pharmacy and Pharmaceutical Sciences, University of Manchester, UK.
authors: E V
authors: EV
authors: Bichenkova
authors: S
authors: S
authors: Frau
authors: O S
authors: OS
authors: Fedorova
authors: K T
authors: KT
authors: Douglas
mesh_terms: D001665:Binding Sites; D006690:Bisbenzimidazole / Q000737:chemistry*; D004277:DNA, Single-Stranded / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D009841:Oligonucleotides / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004277:DNA, Single-Stranded; D005456:Fluorescent Dyes; D008024:Ligands; D009841:Oligonucleotides; D011166:Porphyrins; D006690:Bisbenzimidazole