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[14C]Eukaryotic initiation factor 2 (eIF-2), obtained by reductive methylation of the purified initiation factor, was shown to be active in the unfractionated reticulocyte lysate. This allowed a direct measurement of the endogenous pool size of eIF-2 in rabbit reticulocyte lysate according to the principle of isotope dilution. A value of 20 to 30 pmol/ml of lysate was obtained. Although translational inhibition resulting from hemin deficiency appears to be characterized by a change from catalytic to stoichiometric utilization of eIF-2, the pool size of eIF-2 is too small to account for the normal period of protein synthesis before the onset of translation inhibition. This suggests, therefore, that additional events to eIF-2 alpha phosphorylation may be required for translational inhibition.
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