EIF2S3Eukaryotic translation initiation factor 2 subunit 3 is a protein that in humans is encoded by the EIF2S3 gene.FunctionEukaryotic [initiation factor|Eukaryotic translation initiation factor] 2 functions in the early steps of protein synthesis by forming a ternary complex with GTP and initiator tRNA and binding to a 40S ribosomal subunit. eIF2 is composed of three subunits, alpha (α), beta (β), and gamma, with the protein encoded by this gene representing the gamma subunit.