Investigations on Structure and Biosynthesis of Cyanelle Murein from Cyanophora paradoxa
The endosymbiotic origin of plastids and mitochondria from prokaryotic invaders into originally heterotrophic and anaerobic protoeukaryotic host cells is now generally accepted (Margulis, 1981). However, examples for intermediary or side line forms in this long-lasting and presumably still ongoing process that e. g. combine the function and genetic complexity of an organelle with the distinct prokaryotic structural feature of the peptidoglycan wall could be found to date only for the evolutionary line leading to plastids. The cyanelles from the photoautotrophic protist Cyanophora paradoxa have originally been considered as endosymbiotic cyanobacteria since they resemble them in morphology, thylakoid structure (Giddings et al., 1983), the presence of carboxysomes (Mangeney and Gibbs, 1987) and of a lysozyme-sensitive murein sacculus between their inner and outer envelope membranes (Schenk, 1970).
KeywordsAmino Acid Analysis Glutamic Acid Residue Diaminopimelic Acid Muramic Acid High Retention Time
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