Differential phosphorylation of ribosomal acidic proteins from yeast cell by two endogenous protein kinases: casein kinase-2 and 60S kinase.

R Szyszka; A Boguszewska; N Grankowski; J P Ballesta

doi:10.18388/abp.1995_4634

Differential phosphorylation of ribosomal acidic proteins from yeast cell by two endogenous protein kinases: casein kinase-2 and 60S kinase.

R Szyszka Department of Molecular Biology, Maria Curie-Skłodowska University, Lublin, Poland.;
A Boguszewska
N Grankowski
J P Ballesta

DOI: https://doi.org/10.18388/abp.1995_4634

Abstract

The native 80S ribosomes isolated from Saccharomyces cerevisiae (strain W303) cells was phosphorylated by two endogenous protein kinases: multifunctional casein kinase-2 (CK-2) and specific 60S kinase. Three acidic proteins within the 60S ribosomal subunit: YP1 beta, YP1 beta' and YP2 alpha are phosphorylated by both kinases. The other two proteins: YP1 alpha and YP2 beta are predominantly phosphorylated by CK-2 but not by 60S kinase. This was confirmed in the experiment with the recombinant protein, YP2 beta, as a substrate, which is practically not phosphorylated by specific 60S kinase. These results together with the previous data based on the target amino-acid sequences suggest that, in addition to the multifunctional casein kinase-2 and specific 60S kinase, there exist probably other protein kinase(s) which phosphorylate the ribosomal acidic proteins in the cell.

Published

1995-09-30

Issue

Vol. 42 No. 3 (1995)

Section

Articles

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