SUMMARY: Peptidoglycan has been purified from the photosynthetic organelles (‘cyanelles’) of . The results indicate the presence of -acetylmuramic acid, -acetylglucosamine, alanine, glutamic acid and diaminopimelic acid in the molar ratio of 1:1:1·6:1:1. The peptidoglycan may be present in a lipoprotein-peptidoglycan complex. The structure of the peptidoglycan appears to be identical to that of cyanobacteria and the other Gram-negative bacteria so far studied. Peptidoglycan was also partly purified from two species of cyanobacteria, 7109 and . Since the genome of the cyanelle closely resembles that of chloroplasts, the results suggest that the cyanelle of is an intermediate form between an endosymbiotic cyanobacterium and a chloroplast.


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