Abstract
Eukaryotic initiation factor-2B (eIF-2B) is a guanine nucleotide exchange factor (GEF) that plays a key role in the regulation of protein synthesis. In this study, we have used the baculovirus-infected Sf9 insect cell system to express and characterize the five dissimilar subunits of rat eIF-2B. GEF activity was detected in extracts of Sf9 cells expressing the E- subunit alone and was greatly increased when all five subunits were coexpressed. In addition, high GEF activity was observed in extracts containing a four-subunit complex lacking the α-subunit. Assembly of an eIF- 2B holoprotein was confirmed by coimmunoprecipitation of all five subunits. Gel filtration chromatography revealed that recombinant eIF-2B had the same molecular mass as eIF-2B purified from rat liver and that it did indeed possess GEF activity. Phosphorylation of the substrate eIF-2 inhibited the GEF activity of the five-subunit eIF-2B; this inhibition required the elF-2B α-subunit. The results demonstrate that eIF-2Bα functions as a regulatory sub-unit that is not required for GEF activity, but instead mediates the regulation of eIF-2B by substrate phosphorylation. Furthermore, eIF-2Bε is necessary and is perhaps sufficient for GEF activity in vitro.
Original language | English (US) |
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Pages (from-to) | 12359-12365 |
Number of pages | 7 |
Journal | Journal of Biological Chemistry |
Volume | 272 |
Issue number | 19 |
DOIs | |
State | Published - May 9 1997 |
All Science Journal Classification (ASJC) codes
- Biochemistry
- Molecular Biology
- Cell Biology