Identification of the tRNA-binding sites on rat liver ribosomes by affinity labeling
- 72 Downloads
p-Nitrophenoxycarbonyl-3H-phenylalanyl-tRNAyeastPhebinds to 80S rat liver ribosomes and forms a covalent bond with ribosomal proteins. The affinity labeled proteins were identified by a kind of “three-dimensional” electrophoresis: groups of 80S proteins were cut out of two-dimensional gel slabs, eluted, and separated by electrophoresis in polyacrylamide gels containing sodium dodecyl sulfate; finally, the radioactivity in the protein bands was determined. The proteins L32/L33, L36, L21, L23, L28/L29 and L13 were labeled when the reaction was with poly(U) present. We conclude they are located at or near the peptidyl transferase center. Proteins S7 and/or L9 and a protein in the vicinity of L36 which could not be identified were more radioactive when the affinity reaction was in the absence of poly(U).
p-nitrophenoxycarbonyl-3H-phenylalanyl-tRNAyeastPhe(phenylalanine specific, isolated from yeast)
N-2-hydroxyethylpiperazine-N′-2-ethane sulfonic acid
Unable to display preview. Download preview PDF.