Other
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975orli....6..441o&link_type=abstract
Origins of Life, Volume 6, Issue 3, pp.441-446
Other
Scientific paper
The buoyant density in CsCl of ribosomes from chloroplasts of the green algaChlorella pyrenoidosa and two species of higher plants,Pisum sativum andChenopodium album, has been studied. From the relative protein content it was calculated that 70S ribosomes from chloroplasts are much smaller than 80S cytoplasmic ribosomes (3.0 3.1×106 and 4.0×106 daltons) and slightly larger than 70S ribosomes from abcteriaE. coli 2.5×106 daltons). Chloroplast ribosomes from pea seedlings were analyzed by two-dimensional polyacrylamide gel electrophoresis. They appear to contain 71 proteins. This indicates that chloroplast ribosomes contain a larger number of proteins than do the ribosomes fromE. coli and other species of Enterobacteriaceae. Further study will permit a probable evaluation of the validity of Mereschkowsky's hypothesis that the photosynthetic plastids of eukaryotic plant cells are the evolutionary descendants of endosymbiotic blue-green algae.
Odintsova M. S.
Yurina N. P.
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