Domain

Elongation factor G, III-V domain (IPR009022)

Short name: EFG_III-V

Domain relationships

Description

EF2 (or EFG) participates in the elongation phase of protein synthesis by promoting the GTP-dependent translocation of the peptidyl tRNA of the nascent protein chain from the A-site (acceptor site) to the P-site (peptidyl tRNA site) of the ribosome. EF2 also has a role after the termination phase of translation, where, together with the ribosomal recycling factor, it facilitates the release of tRNA and mRNA from the ribosome, and the splitting of the ribosome into two subunits [PMID: 12471894]. EF2 is folded into five domains, with domains I and II forming the N-terminal block, domains IV and V forming the C-terminal block, and domain III providing the covalently-linked flexible connection between the two. Domains III and V have the same fold (although they are not completely superimposable and domain III lacks some of the superfamily characteristics), consisting of an alpha/beta sandwich with an antiparallel beta-sheet in a (beta/alpha/beta)x2 topology [PMID: 11054294]. This double split beta/alpha/beta fold is also seen in a number of ribonucleotide binding proteins. It is the most common motif occurring in the translation system and is referred to as the ribonucleoprotein (RNP) or RNA recognition (RRM) motif.

This domain is found in EF2 proteins from both prokaryotes and eukaryotes, as well as in some tetracycline resistance proteins, peptide chain release factors [PMID: 8643594], and in the C-terminal region of the bacterial hypothetical protein, YigZ.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
Pfam
SUPERFAMILY