Eukaryotic translation initiation factor 5B (EIF5B)

Plays a role in translation initiation. Translational GTPase that catalyzes the joining of the 40S and 60S subunits to form the 80S initiation complex with the initiator methionine-tRNA from the P-site base paired to the start codon.

GTP binding and hydrolysis induces conformational changes in the enzyme that renders it active for productive interactions with the ribosome. The release of the enzyme after formation of the initiation complex is a necessity to form elongation-competent ribosomes.