Function:eIF-2 functions in the early steps of protein synthesis by forming a ternary complex with GTP and initiator tRNA. This complex binds to a 40S ribosomal subunit , followed by mRNA binding to form a 43S preinitiation complex. Junction of the 60S ribosomal subunit to form the 80S initiation complex is preceded by hydrolysis of the GTP bound to eIF-2 and release of an eIF-2-GDP binary complex. In order for eIF-2 to recycle and catalyze another round of initiation , the GDP bound to eIF-2 must exchange with GTP by way of a reaction catalyzed by eIF-2B. ,similarity:Belongs to the eIF-2-beta/eIF-5 family. ,subunit:Heterotrimer composed of an alpha , a beta and a gamma chain. Component of an EIF2 complex at least composed of CUGBP1 , CALR , CALR3 , EIF2S1 , EIF2S2 , HSP90B1 and HSPA5. ,
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