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The acidic ribosomal protein P2 from Euplotes octocarinatus is phosphorylated at its N-terminal domain

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The eukaryotic acid ribosomal P0, P1, and P2 proteins share a conserved flexible C-terminal tail that is rich in acidic residues, which are involved in the interaction with elongation factor 2 during protein synthesis. Our previous work suggested that the acidic ribosomal P proteins from Euplotes octocarinatus have a special C-terminal domain. To further understand this characteristic feature, both P2 and elongation factor 2 from E. octocarinatus were overexpressed, for the first time, in Escherichia coli in this study. GST pull-down assay indicated that P2 protein from E. octocarinatus (EoP2) interacted specifically with the N-terminal domain of elongation factor 2 from E. octocarinatus (EoEF-2) in vitro. The interacting part of EoP2 is in the C-terminal domains, consistent with the observation in other organisms. Phosphorylation of the recombinant EoP2 was performed in vitro using multiple methods such as 31P-NMR spectroscopy, native PAGE, and Phos-tagTM SDS-PAGE. Results showed that ribosomal protein EoP2 was phosphorylated by casein kinase II at serine 21 located at the N terminus. This phosphorylation site identified in EoP2 is quite different from that of P2 from other organisms, in which the phosphorylation site is located in the conserved C-terminal region.
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Keywords: Euplotes octocarinatus; acidic ribosomal protein; phosphorylation; protéine ribosimique acide

Document Type: Research Article

Affiliations: 1: Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Biotechnology, Shanxi University, Taiyuan 030006, China. 2: Research Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China. 3: Institute of Molecular Science, Shanxi University, Taiyuan 030006, China.

Publication date: January 1, 2014

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