Abstract
Bean chloroplasts treated with galactolipase (lipolytic acyl hydrolase) isolated from bean leaves showed an inhibition of photosystem I activity as measured by methyl viologen-mediated oxygen uptake and NADP+ photoreduction. This inhibition was partially reversed by exogenous plastocyanin added to galactolipase-treated thylakoid membranes. Galactolipase released substantial amounts of endogenous plastocyanin (about 40%) from bean chloroplasts. The results are discussed with regard to the localization of plastocyanin in thylakoid membranes.
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Abbreviations
- chlf:
-
chlorophyll
- DCMU:
-
3-(2,4-dichlorophenyl)-1′,1′-dimethylurea
- DGDG:
-
digalactosyldiacylglycerol
- MGDG:
-
monogalactosyldiacylglycerol
- MV:
-
methyl viologen
- NADP+ :
-
nicotinamide dinucleotide phosphate
- PC:
-
phosphatidylcholine
- PG:
-
phosphatidylglycerol
- PE:
-
phosphatidylethanolamine
- PI:
-
phosphatidylinositol
- SQDG:
-
sulphoquinovosyldiacylglycerol
- SDS:
-
sodium dodecyl sulphate
- TMPD:
-
N,N,N′,N′-tetramethyl-p-phenylenediamine
- Tricine:
-
N-Tris-(hydroxymethyl)-methylglycine
- Tris:
-
Tris-(hydroxymethyl)-aminomethane
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Krupa, Z. The action of lipases on chloroplast membranes I. The release of plastocyanin from galactolipase-treated thylakoid membranes . Photosynth Res 3, 95–104 (1982). https://doi.org/10.1007/BF00040707
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DOI: https://doi.org/10.1007/BF00040707