PathwayStep432 PathwayStep430 PathwayStep431 GTP bound eRF3:eRF1 complex binds the peptidyl tRNA:mRNA:80S Ribosome complex GTP Hydrolysis by eRF3 bound to the eRF1:mRNA:polypeptide:80S Ribosome complex Polypeptide release from the eRF3-GDP:eRF1:mRNA:80S Ribosome complex Eukaryotic Translation Termination Authored: Bedwell, DM, 2004-11-09 15:40:58 Edited: Gillespie, ME, 0000-00-00 00:00:00 GENE ONTOLOGYGO:0006415 Pubmed15314182 Pubmed2684966 Reactome Database ID Release 4372764 Reactome, http://www.reactome.org ReactomeREACT_1986 The arrival of any of the three stop codons (UAA, UAG and UGA) into the ribosomal A-site triggers the binding of a release factor (RF) to the ribosome and subsequent polypeptide chain release. In eukaryotes, the RF is composed of two proteins, eRF1 and eRF3. eRF1 is responsible for the hydrolysis of the peptidyl-tRNA, while eRF3 provides a GTP-dependent function. The ribosome releases the mRNA and dissociates into its two complex subunits, which can reassemble on another molecule to begin a new round of protein synthesis. It should be noted that at present, there is no factor identified in eukaryotes that would be the functional equivalent of the bacterial ribosome release (or recycling) factor, RRF, that catalyzes dissociation of the ribosome from the mRNA following release of the polypeptide