Ontology type: schema:Chapter
1997
AUTHORSMasami Kobayashi , Hideo Kise , Charles Tanielian , Christian Wolff , Minoru Toriya , Masataka Nakazato , Masako Sasaki , Masaaki Matsuda , Masao Hisatome
ABSTRACTPlasmid DNA has been efficiently photocleaved under anaerobic condition by water-soluble pheophorbides (sodium pheophorbides, Na-Phde) a and b and a novel coproporphyrin III with zinc (zinc phyrin) produced by Strep-tomyces sp. Singlet oxygen production sensitized by Na-Phde a or b cannot be observed in the aqueous media, although zinc phyrin produced singlet oxygen in about 17% quantum yield. Direct evidence for the electron capture from the nucleic acid bases adenine and guanine by porphyrin derivatives in the singlet excited states has been first obtained by using nucleobase-attached porphyrins. A guanine-attached porphyrin showed the strongest reduction of fluorescence derived from the porphyrin ring, and an adenine-attached porphyrin showed the second strongest reduction. This is the first evidence in support of the electron transfer mechanism for the oxygen-independent photocleavage of DNA. Fluorescence microscopic observation has shown a rapid incorporation of Na-Phde a and zincphyrin into the nuclei, mitochondria, and lysosomes of human oral mucosa cells, although Na-Phde b has been incorporated only into the plasma membrane. Red fluorescence from Na-Phde a and zincphyrin rapidly decayed during the microscopic observation, indicating that some photochemical reactions take place in the organelle. More... »
PAGES572-576
Food Factors for Cancer Prevention
ISBN
978-4-431-67019-3
978-4-431-67017-9
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DOIhttp://dx.doi.org/10.1007/978-4-431-67017-9_113
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