title: Photodynamic inactivation and its repair in mycoplasmas.
abstract: Photodynamic inactivation is the loss in viability observed when organic dye-treated cells are exposed to visible light and molecular oxygen. The photodynamic inactivation of mycoplasmas, the smallest free living cells, has been studied. Depending on the extent of inactivation in Acholeplasma laidlawii, photodynamic induced damage can be repaired if the irradiated cells are incubated in the dark in buffer. Analysis of the DNA of these cells shows that photodynamic inactivation induces single strand breaks which can be repaired during liquid holding. To examine possible damage to the cell membrane, glucose uptake was studied as a permeability measure. Neither acriflavine nor photodynamic inactivation had any measurable effect on membrane permeability.
mesh_terms: D000128:Acholeplasma laidlawii / Q000235:genetics*; D000167:Acriflavine / Q000494:pharmacology; D001426:Bacterial Proteins / Q000096:biosynthesis; D002463:Cell Membrane Permeability / Q000187:drug effects; D004260:DNA Repair; D004269:DNA, Bacterial / Q000096:biosynthesis / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D008027:Light; D009174:Mycoplasma / Q000235:genetics*; D012329:RNA, Bacterial / Q000096:biosynthesis
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D012329:RNA, Bacterial; D000167:Acriflavine