Cytokinin Activity: Localization in Transfer RNA Preparations
- 9 December 1966
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 154 (3754), 1354-1356
- https://doi.org/10.1126/science.154.3754.1354
Abstract
Transfer RNA from yeast, liver, and Escherichia coli has cytokinin activity in the tobacco callus bioassay, whereas ribosomal RNA from yeast is inactive. In contrast to fractions of yeast transfer RNA rich in serine acceptor and cytokinin activity, preparations (70 to 90 percent pure) of arginine transfer RNA2, glycine transfer RNA, phenylalanine transfer RNA, and valine transfer RNA1 and of highly purified alanine transfer RNA from yeast were inactive at concentrations of 20 to 2500 micrograms per liter. One molecule of 6-(γ,γ-dimethylallylamino) purine per 20 molecules of yeast tRNA would account for the observed cytokinin activity. The number of major molecular species contributing to cytokinin activity of transfer RNA, therefore, must be small.This publication has 13 references indexed in Scilit:
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