FEATURES

FAMILY

Classic translation factor GTPase family

DESCRIPTION

Also known as IF2G_HUMAN, EIF2S3, EIF2G. As a subunit of eukaryotic initiation factor 2 (eIF-2), involved in the early steps of protein synthesis. In the presence of GTP, eIF-2 forms a ternary complex with initiator tRNA Met-tRNAi and then recruits the 40S ribosomal complex and initiation factors eIF-1, eIF-1A and eIF-3 to form the 43S pre-initiation complex (43S PIC), a step that determines the rate of protein translation. The 43S PIC binds to mRNA and scans downstream to the initiation codon, where it forms a 48S initiation complex by codon-anticodon base pairing. This leads to the displacement of eIF-1 to allow GTPase-activating protein (GAP) eIF-5-mediated hydrolysis of eIF2-bound GTP. Hydrolysis of GTP and release of Pi, which makes GTP hydrolysis irreversible, causes the release of the eIF-2-GDP binary complex from the 40S subunit, an event that is essential for the subsequent joining of the 60S ribosomal subunit to form an elongation-competent 80S ribosome. In order for eIF-2 to recycle and catalyze another round of initiation, the GDP bound to eIF-2 must be exchanged with GTP by way of a reaction catalyzed by GDP-GTP exchange factor (GEF) eIF-2B (By similarity). Along with its paralog on chromosome Y, may contribute to spermatogenesis up to the round spermatid stage (By similarity). The eukaryotic translation initiation factor 2 complex/eIF2 is a heterotrimer composed of an alpha subunit, also called subunit 1 (encoded by EIF2S1), a beta subunit, also called subunit 2 (encoded by EIF2S2) and a gamma subunit, also called subunit 3 (encoded by EIF2S3).

EXTERNAL LINKS

EIF2S3

Eukaryotic translation initiation factor 2 subunit 3

EIF2S3

Molecular Synopsis