[Retinal-sensitized photo-oxidation of rhodopsin]. / Sensibilizirovannoe retinalem fotookislenie rodopsina.
Biofizika
; 30(6): 995-9, 1985.
Article
em Ru
| MEDLINE
| ID: mdl-4074767
ABSTRACT
Kinetics of retinal photosensitized initiation of radicals of sulfhydryl groups of cysteine and rhodopsin is investigated by spin trapping. Photooxidation of both systems is the result of free radical mechanism. Photooxidation of SH-groups proceeds both with singlet oxygen participation and by direct interaction of photosensitizer with the substrate. The rate constants of these reactions are measured. The rate constant with oxygen participation (K0 = 1.1 X 10(9) M-1 S-1) is higher than the one without oxygen (K = 2.5 X 10(8) M-1 S-1) correspondingly. The lifetime of retinal triplet state in photoreceptor membrane is tau = 4 X 10(-6) s.
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Base de dados:
MEDLINE
Assunto principal:
Células Fotorreceptoras
/
Pigmentos da Retina
/
Retinaldeído
/
Retinoides
/
Rodopsina
/
Segmento Externo da Célula Bastonete
Idioma:
Ru
Ano de publicação:
1985
Tipo de documento:
Article