LIGHT-INDUCED OXIDATION OF A CHLOROPLAST B-TYPE CYTOCHROME AT -189°C | Zendy

David B. Knaff | Zendy; Daniel I. Ar | Zendy

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LIGHT-INDUCED OXIDATION OF A CHLOROPLAST B-TYPE CYTOCHROME AT -189°C

Author(s) -

David B. Knaff,

Daniel I. Ar

Publication year - 1969

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.63.3.956

Subject(s) - photochemistry , photosystem i , chloroplast , cytochrome b6f complex , p700 , photosynthesis , photosystem ii , cytochrome f , chemistry , cytochrome , chlorophyll , electron transport chain , chlorophyll a , cytochrome b , photosynthetic reaction centre , photosystem , cytochrome c , electron transfer , biochemistry , mitochondrion , enzyme , organic chemistry , gene , mitochondrial dna

The b-type cytochromes of chloroplasts have heretofore been viewed as photosynthetic electron carriers that probably occupy an intermediate position in a light-induced electron flow. The oxidation-reduction of such intermediate electron carriers, being removed from the primary photochemical reaction linked to photon capture by chlorophyll, would be expected to show a temperature dependence. Evidence has now been obtained that cytochrome b(559) is photooxidized at -189 degrees C and that this photooxidation can be induced only by "short-wavelength" monochromatic light which activates the oxygen-evolving system in chloroplasts (photosystem II). In appears, therefore, that photooxidation of cytochrome b(559) is closely linked with photon capture by the chlorophyll pigments characteristic of photosystem II.

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