Drosophila melanogaster cDNA clones encoding the β subunit of translation initiation factor 2 (eIF-2) were isolated and sequenced. The longest cDNA predicts a protein of 312 amino acids (aa), which possesses a putative RNA-binding motif and a highly charged N-terminal region composed of three basic polylysine blocks. The aa sequence comparison of D. melanogaster eIF-2β with its human and yeast counterparts demonstrates a high degree of similarity, especially within the C-terminal region. Northern analysis indicates quasi-constitutive expression of eIF-2β throughout D. melano gaster development.
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