title: Reconstruction of the smaller subparticle of rabbit ribosomes from core-particle and split-protein fractions.
abstract: The smaller subparticle of rabbit reticulocyte ribosomes was shown to yield core-particle and split-protein fractions on treatment with 2.5 M-NH4Cl/61 mM-MgCl2. The core-particle fraction was inactive in poly(U)-directed polyphenylalanine synthesis, but activity was restored after recombination with the split-protein fraction. Optimum ionic conditions for the reconstruction of active subparticles were found to be 0.75 M-NH4Cl/19 mM-MgCl2 at 0 degrees C. Improved extents of reconstruction were obtained when the core-particles were isolated by methods that avoided pelleting. Core-particles isolated from subparticles pretreated with either proteinases or ribonucleases had diminished capacity to become re-activated.
mesh_terms: D000818:Animals; D004591:Electrophoresis, Polyacrylamide Gel; D066298:In Vitro Techniques; D010452:Peptide Biosynthesis; D010455:Peptides; D011817:Rabbits; D012156:Reticulocytes / Q000378:metabolism; D012260:Ribonucleases / Q000494:pharmacology; D012269:Ribosomal Proteins / Q000378:metabolism*; D012270:Ribosomes / Q000187:drug effects / Q000378:metabolism; D012492:Salts / Q000494:pharmacology; D014357:Trypsin / Q000494:pharmacology
chemical_list: D010455:Peptides; D012269:Ribosomal Proteins; D012492:Salts; C012001:polyphenylalanine; D012260:Ribonucleases; D014357:Trypsin