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Purification of Two Yeast Serine Transfer Ribonucleic Acids by Countercurrent Distribution

From the ¹ From the Division of Biochemistry, Walter Reed Army Institute of Research, Walter Reed Army Medical Center, Washington, D. C. 20012

Countercurrent distribution procedures for the separation of yeast serine transfer ribonucleic acids and the purification of two of these RNAs have been described. The specific activity of both serine transfer RNAs increased 21-fold, and these RNAs appear to be homogeneous, single molecular species by several criteria. The yeast and rat liver aminoacyl soluble ribonucleic acid synthetases incorporate serine to the same extent into both the serine RNA components, whereas the Escherichia coli aminoacyl soluble ribonucleic acid synthetase is inactive with both the serine RNA components. Preliminary analysis of products obtained by digestion of these two RNA components with pancreatic RNase has shown that they contain many identical monoand oligonucleotides with differences in the (ApGp)GpUp and ApUp content.

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