The course of the assembly of ribosomal subunits in yeast - PubMed (original) (raw)
The course of the assembly of ribosomal subunits in yeast
T Kruiswijk et al. Biochim Biophys Acta. 1978.
Abstract
The course of the assembly of the various ribosomal proteins of yeast into ribosomal particles has been studied by following the incorporation of radioactive individual protein species in cytoplasmic ribosomal particles after pulse-labelling of yeast protoplasts with tritiated amino acids. The pool of ribosomal proteins is small relative to the rate of ribosomal protein synthesis, and, therefore, does not affect essentially the appearance of labelled ribosomal proteins on the ribosomal particles. From the labelling kinetics of individual protein species it can be concluded that a number of ribosomal proteins of the 60 S subunit (L6, L7, L8, L9, L11, L15, L16, L23, L24, L30, L32, L36, L40, L41, L42, L44 and L45) associate with the ribonucleoprotein particles at a relatively late stage of the ribosomal maturation process. The same was found to be true for a number of proteins of the 40 S ribosomal subunit (S10, S27, S31, S32, S33 and S34). Several members (L7, L9, L24 and L30) of the late associating group of 60-S subunit proteins were found to be absent from a nuclear 66 S precursor ribosomal fraction. These results indicate that incorporation of these proteins into the ribosomal particles takes place in the cytoplasm at a late stage of the ribosomal maturation process.
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