Affinity purification of ARE-binding proteins identifies polyA-binding protein 1 as a potential substrate in MK2-induced mRNA stabilization.

An important determinant for the expression level of cytokines and proto-oncogenes is the rate of degradation of their mRNAs. AU-rich sequence elements (AREs) in the 3(') untranslated regions have been found to impose rapid decay of these mRNAs. ARE-containing mRNAs can be stabilized in response to external signals which activate ...
the p38 MAP kinase cascade including the p38 MAP kinase substrate MAPKAP kinase 2 (MK2). In an attempt to identify components downstream of MK2 in this pathway we analyzed several proteins which selectively interact with the ARE of GM-CSF mRNA. One of them, the cytoplasmic poly(A)-binding protein PABP1, co-migrated with a protein that showed prominent phosphorylation by recombinant MK2. Phosphorylation by MK2 was confirmed using PABP1 purified by affinity chromatography on poly(A) RNA. The selective interaction with an ARE-containing RNA and the phosphorylation by MK2 suggest that PABP1 plays a regulatory role in ARE-dependent mRNA decay and its modulation by the p38 MAP kinase cascade.
Mesh Terms:
3' Untranslated Regions, Base Sequence, Chromatography, Affinity, Granulocyte-Macrophage Colony-Stimulating Factor, HeLa Cells, Humans, Intracellular Signaling Peptides and Proteins, Phosphorylation, Poly(A)-Binding Protein I, Protein-Serine-Threonine Kinases, RNA, RNA Stability, RNA, Messenger, RNA-Binding Proteins, Regulatory Sequences, Nucleic Acid
Biochem. Biophys. Res. Commun.
Date: Feb. 14, 2003
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