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Age dependent changes in fungi: Ribosomes and protein synthesis in Rhizoctonia solani mycelium

Archives of Microbiology, ISSN: 0302-8933, Vol: 95, Issue: 1, Page: 325-336
1974
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Increasing age of Rhizoctonia solani cells was accompanied by a decrease in protein synthesis but not by a fall in the number of ribosomes present. There was, however, a shift from predominantly polyribosomes in young cells actively synthesizing protein, to mainly monoribosomes in older less active cells, and it is suggested that protein synthesis is restricted in these older cells by some defect at the initiation step of protein synthesis. The major site of protein synthesis throughout ageing was the free ribosome fraction with little or no contribution from membrane-bound ribosomes. For reasons not understood, the free ribosomes failed to sediment through 2.0 M sucrose, and only by using 1.4 M sucrose were good separations obtained. © 1974 Springer-Verlag.

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