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  • Title: Role of acidic phosphoproteins in the partial reconstitution of the active 60 S ribosomal subunit.
    Author: Lavergne JP, Conquet F, Reboud JP, Reboud AM.
    Journal: FEBS Lett; 1987 May 25; 216(1):83-8. PubMed ID: 3582668.
    Abstract:
    We have recently shown that rat liver 60 S ribosomal subunits active in protein synthesis can be reconstituted from inactive core particles lacking 30% of the total proteins, mainly L10a, L12, L22, L24, A33 and the acidic phosphoproteins P1-P2, obtained by treatment of 60 S subunits with dimethylmaleic anhydride [(1987) Eur. J. Biochem. 163, 15-20]. In this study, an ethanol extract of the 60 S subunit which contains only P1 P2 was also shown to be effective in reconstitution with the DMMA-core-particles: it strongly stimulated the EF-2-dependent GTP hydrolysis and, to a lesser extent, polyphenylalanine synthesis; like the DMMA wash it shifted the thermal denaturation curve of the DMMA-core particles towards that of control subunits. Prior dephosphorylation of the ethanol extract by alkaline phosphatase inhibited the reconstruction process.
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