Abstract
Excessive concentrations of the eukaryotic initiation factor 2(eIF-2).stimulating protein, a factor that catalyzes the formation of binary (GTP.eIF-2) and ternary (GTP.eIF-2.initiator methionyl-tRNA) initiation complexes at physiological Mg2+ concentrations, can cause ternary complex dissociation when the Mg2+ concentration is raised from 0.5 to 5.0 mM. Stimulation of ternary complex formation and dissociation have similar (a) pH optima, (b) metal ion specificity, and (c) sensitivity to phosphorylation of the eIF-2 alpha subunit. The results suggest that ternary complex dissociation is an artifact with no physiological significance.
| Original language | English |
|---|---|
| Pages (from-to) | 4162-4165 |
| Number of pages | 4 |
| Journal | Journal of Biological Chemistry |
| Volume | 257 |
| Issue number | 8 |
| State | Published - 25 Apr 1982 |