Genomic cloning and characterization of the human eukaryotic initiation factor-2β promoter

The translation initiation factor eIF2 consists of three subunits that are present in equal molar amounts. The genomic DNA containing the gene for eIF2 beta and its promoter were cloned and sequenced to characterize further the mechanism of their regulated synthesis. Whereas Southern blot analysis indicated that a number of copies of the gene may exist, only one full-length intron-containing copy was identified. Similar to the eIF2 alpha promoter, the eIF2 beta promoter is TATA-less, CAAT-less, and CC-rich and contains an alpha-Pal binding motif, Mutation of the alpha-Pal binding sequence resulted in an 8-fold decrease in activity when assayed by the luciferase reporter gene constructs. The data suggest a common mechanism of transcriptional control for the two cloned subunits of eIF2.