Stadienspezifische Quantitätsveränderungen der ChlorophyllProtein-Komplexe CP I and CP II von synchronisierter Euglena gracilis, Stamm Z)

Functional and structural organization of chlorophyll in the developing photosynthetic membranes of Euglena gracilis Z. V-separation and characterization of pigment-protein complexes of the differentiated thylakoids

Low temperature sodium dodecyl sulfate polyacrylamide gel electrophoresis following mild solubilization of Euglena thylakoid components allowed to resolve, in addition to the main CP1, CPa and LHCP chlorophyll-protein complexes, the additional CP1a and LHCP' green bands. A carotenoid enriched band CPc can be separated from CPa using high acrylamide concentration. Pigment and polypeptide composition of these complexes were analyzed by absorption and fluorescence measurements and two dimensional gel electrophoresis. Spectral properties of CP1 and CP1a indicate an heterogenous organization of chlorophyll and the presence of significant amount of chlorophyll b in these complexes. They both contain a major 68 kilodalton polypeptide associated with three minor low molecular weight polypeptides in CP1a. CPa and CPc exhibit a characteristic fluorescence emission at 687 nm and they each contain one polypeptide of 54 and 41 Kda respectively. LHCP and LHCP' are less abundant than in higher plant thylakoids and they contain a lower proportion of chl b (chl a: chl b=3). They include two polypeptides of 26 and 29 Kda.

On the developmental dependence between Cyanophora paradoxa and Cyanocyta korschikoffiana in symbiosis : Host-dependent development of endocyanelles

The prokaryote Cyanocyta korschikoffiana was isolated from the eukaryote Cyanophora paradoxa. The synthesis of several thylakoid proteins in these cyanelles is influenced by light and darkness and is sensitive to cycloheximide, the inhibitor of the eukaryotic host's translation. The possibility of a direct coordination between the translations of the host and of the cyanelles is discussed.