Ribonucleic acid degrading activity associated with ribosomes from spinach leaf chloroplasts

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Abstract
Ribosomes isolated from the chloroplasts of spinach leaves show the presence of RNA-degrading activity. The activity is optimal at pH 6.0 and at temperatures between 37 and 40 °C. The activity is cation-independent, exhibits exonuclease properties, and is considerably more pronounced under conditions in which the ribosome particles are in the dissociated state. The results are interpreted as showing that the RNA-degrading activity is a component part of the free ribosome population in the chloroplast.

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