Photosynthesis by isolated chloroplasts: VII. Vitamin K and riboflavin phosphate as cofactors of cyclic photophosphorylation

Vitamin K substances and FMN appear to catalyze separate pathways of cyclic photophosphorylation. The FMN pathway shows a dependence on added TPN and greater sensitivity to inhibition by dinitrophenol and o-phenanthroline than the vitamin K pathway. Both pathways are inhibited by p-chloromercuribenz...

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Published inBiochimica et biophysica acta Vol. 32; no. 1; pp. 32 - 46
Main Authors Whatley, F.R., Allen, M.B., Arnon, Daniel I.
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.03.1959
Subjects
Antifibrinolytic Agents
Chloroplasts
Coenzymes
Flavin Mononucleotide
Naphthoquinones
Old Medline
Phosphates
Photophosphorylation
Photosynthesis
Vitamin K
tris(hydroxymethyl)aminomethane
TPN
DPN
ATP, ADP
FMN
COENZYMES
PHOTOSYNTHESIS
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Summary:Vitamin K substances and FMN appear to catalyze separate pathways of cyclic photophosphorylation. The FMN pathway shows a dependence on added TPN and greater sensitivity to inhibition by dinitrophenol and o-phenanthroline than the vitamin K pathway. Both pathways are inhibited by p-chloromercuribenzoate, gramicidin and methylene blue but not by arsenite or antimycin A. Cyclic photophosphorylation catalyzed by phenazine methosulfate resembled the vitamin K pathway in its independence from added TPN and resistance to inhibition by dinitrophenol and o-phenanthroline. The role of vitamin K in phosphorylations by plant and animal tissues is reviewed. A possible physiological role for cyclic photophosphorylation in photosynthesis of green plants is suggested.
Bibliography:ObjectType-Article-1
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ISSN:0006-3002
1878-2434
DOI:10.1016/0006-3002(59)90550-5