| | 1 | Author
| E. Interschick-Niebler, H. K. Lichtenthaler | Requires cookie* | | | Title
| Partition of Phylloquinone Kx between Digitonin Particles and Chlorophyll-Proteins of Chloroplast Membranes from Nicotiana tabacum  | | | | Abstract
| The partition of phylloquinone (vitamin K J, o f chlorophylls a and b and of the two main carotenoids, /?-carotene and lutein, in subthylakoid particles (digitonin treatment) and chlorophyll protein complexes (sodium dodecylsulfate polyamide-gel electrophoresis) isolated from tobacco chloroplasts (Nicotiana tabacum L.) is described. 1. The "light particle" fractions (S 90000, S 150000) of digitonin fragmented chloroplasts are enriched in CP I and contain a higher proportion o f phylloquinone, chorophyll a and /?-carotene as compared to whole chloroplasts. This is visualized by high values for the ratio a/b (6 -8) and for /?-carotene/lutein (1.7) as well as about 3 mol of Kx per 100 mol o f total chlorophyll. The "heavy digitonin particle" fraction (10000 x g sediment), in turn, contains a higher proportion of chlorophyll b and lutein, but a lower level of phylloquinone than whole chloroplasts. 2. The chlorophyll a-protein CP I o f pigmentsystem I, isolated by preparative gel electro phoresis using 0.5% and 4% SDS, is characterized by a stable level of phylloquinone (1 mol Kt per 100 mol o f total chlorophyll), high chlorophyll a/b ratios (7 -1 0) and high values for ß-carotene/lutein (~ 6.0). The light-harvesting chlorophyll a/b-protein LHCP o f photosystem II (chlorophyll a/b = 1.1 — 1.5, ^-carotene/lutein = < 0.1) contains either low amounts of phylloquinone (0.5% SDS) or only trace amounts o f Kj (4% SDS). The free pigment fraction (FP) contains at 0.5% SDS 57% of the total phylloquinone of thylakoid membranes. At 4% SDS the K? amount in the free pigment fraction increases to 84%. 3. The phylloquinone partition studies in digitonin particles and SDS chlorophyll proteins indicate that there exist at least two localization sites for phylloquinone Kj in the photosynthetic membrane. The CP I complex and a second site, presumably near photosystem II (CPa?). | | | |
Reference
| Z. Naturforsch. 36c, 276 (1981); received January 131981 | | | |
Published
| 1981 | | | |
Keywords
| Phylloquinone, Thylakoid Composition, Chlorophyll-Proteins, Chlorophyll a/b Ratio, Carotenoids, Digitonin Particles | | | |
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| default:Reihe_C/36/ZNC-1981-36c-0276.pdf | | | | Identifier
| ZNC-1981-36c-0276 | | | | Volume
| 36 | |
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