Evidence for a soluble protein factor specific for the interaction between aminoacylated transfer RNA's and the 40 s subunit of mammalian ribosomes.

Amino Acyl-tRNA Synthetases/metabolism Animals Binding Sites Chromatography Coliphages Escherichia coli Glutathione Guanosine Triphosphate In Vitro Techniques Liver/metabolism Magnesium Peptide Chain Elongation, Translational Phenylalanine Proteins/metabolism RNA, Transfer/metabolism RNA, Viral Rats Ribosomes/metabolism Solubility Stimulation, Chemical Sulfhydryl Reagents Templates, Genetic Tritium

Proteins RNA, Viral Sulfhydryl Reagents Tritium Phenylalanine Guanosine Triphosphate RNA, Transfer Amino Acyl-tRNA Synthetases Glutathione Magnesium