title: In vitro translation studies of the cytoplasmic nonpolysomal particles containing messenger RNA.
abstract: We analyzed the translational capacity of different kinds of free cytoplasmic messenger ribonucleoprotein complexes (free mRNP) in a Hela cell cell free system. Native free mRNP are not translated although free mRNP washed with 0.5 M KC1 can direct polypeptide synthesis. Furthermore, the 0.5 M KC1 wash possesses a factor which inhibits the translation of 0.5 M KC1 washed free mRNP as well as globin mRNA naked mRNA from plasmocytoma, or Hela cells. We also demonstrated that native free mRNP are able to form a complex with ribosomal subunits in the presence of initiation factors. This indicates that inhibition of translation by the 0.5 M KC1 wash occurs either at some point after initiation complex formation or at the elongation step.
mesh_terms: D002474:Cell-Free System; D006367:HeLa Cells / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D008970:Molecular Weight; D009698:Nucleoproteins / Q000378:metabolism*; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000378:metabolism*; D012261:Ribonucleoproteins / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism
chemical_list: D009698:Nucleoproteins; D012333:RNA, Messenger; D012261:Ribonucleoproteins