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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The Saccharomyces cerevisiae translation initiation factor Tif3 and its mammalian homologue, eIF-4B, have RNA annealing activity.

The Saccharomyces cerevisiae TIF3 gene encodes the yeast homologue of mammalian translation initiation factor eIF-4B. We have added six histidine residues to the C-terminus of Tif3 protein (Tif3-His6p) and purified the tagged protein by affinity chromatography. Tif3-His6p stimulates translation and mRNA binding to ribosomes in a Tif3-dependent in vitro system. Furthermore, it binds to single-stranded RNA and catalyses the annealing of partially complementary RNA strands in vitro. In parallel experiments, RNA annealing activity could also be demonstrated for mammalian eIF-4B. A role for Tif3/eIF-4B and RNA annealing activity in the scanning process is proposed.[1]


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