Models of DNA-dye-complexes: Energy transfer and molecular structures as evaluated by laser excitation

DNA structure-specific sensitization of a metalloporphyrin leads to an efficient in vitro quadruplex detection molecular tool

The palladated porphyrin Pd·TEGPy is an efficient turn-on, quadruplex-selective fluorophore thanks to peculiar supramolecular and electronic properties that results in a unique DNA structure-specific sensitization mechanism.

Investigations on the mechanism of photodynamic action of different psoralens with DNA

Investigations on the photodynamic action of psoralens with DNA were performed, using experimental techniques of fluorescence lifetime and NMR-CIDNP, as well as SCF-MO and CNDO molecular orbital calculations. It has been shown that the formation of a biradical through the triplet state is the decisive step for psoralen dimer formation, as well as for cyclobutane addition with thymine, while singlet oxygen production is responsible for enzyme inactivation (e.g., lysozyme and trypsin). The molecular orbital calculations, in agreement with experimental results, indicate that the differences in biological effectivity of different psoralens are based on variations in triplet formation probability.