Identification of Interprotein Interactions between the Subunits of Eukaryotic Initiation Factors eIF2 and eIF2B
| Autor: | Nina K. Heinzinger, Rick L. Horetsky, Leonard S. Jefferson, Scot R. Kimball |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Eukaryotic Initiation Factor-2
Protein Serine-Threonine Kinases Biochemistry Animals Guanine Nucleotide Exchange Factors Initiation factor Protein phosphorylation Phosphorylation Casein Kinase II Peptide Chain Initiation Translational Protein kinase A Molecular Biology Protein Kinase C eIF2 Binding Sites biology Binding protein Proteins Cell Biology Autophagy-related protein 13 Rats Eukaryotic Initiation Factor-2B Mutagenesis eIF2B biology.protein Casein kinase 2 Protein Binding |
| Zdroj: | Journal of Biological Chemistry. 273:3039-3044 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.273.5.3039 |
| Popis: | Modulation of protein/protein interaction is an important mechanism involved in regulation of translation initiation. Specifically, regulation of the interaction of eIF2 with the guanine nucleotide exchange factor, eIF2B, is a key mechanism for controlling translation under a variety of conditions. Phosphorylation of the alpha-subunit of eIF2 converts the protein into a competitive inhibitor of eIF2B by causing an increase in the binding affinity of eIF2B for eIF2. Consequently, it has been assumed that the alpha-subunit of eIF2 is directly involved in binding to eIF2B. In the present study, eIF2 was found to bind only to the delta- and epsilon-subunits of eIF2B, and eIF2B was shown to bind only to the beta-subunit of eIF2 by far-Western blot analysis. The binding site on eIF2beta for either the eIF2B holoprotein, or the isolated delta- or epsilon-subunits of eIF2B was shown to be located within approximately 70 amino acids of the C terminus of the protein. Phosphorylation of the alpha-subunit of eIF2 did not promote binding of eIF2B to the isolated subunit. However, it did cause an increase in the affinity of eIF2B for eIF2. Finally, phosphorylation by protein kinase A of the beta-subunit of eIF2 in the C-terminal portion of the protein increased the guanine nucleotide exchange activity of eIF2B, whereas phosphorylation by casein kinase II or protein kinase C was without effect. |
| Databáze: | OpenAIRE |
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