Elongation factor, GTP-binding domain (IPR000795)

Short name: EF_GTP-bd_dom

Domain relationships



Elongation factors belong to a family of proteins that promote the GTP-dependent binding of aminoacyl tRNA to the A site of ribosomes during protein biosynthesis, and catalyse the translocation of the synthesised protein chain from the A to the P site. The proteins are all relatively similar in the vicinity of their C-termini, and are also highly similar to a range of proteins that includes the nodulation Q protein from Rhizobium meliloti (Sinorhizobium meliloti), bacterial tetracycline resistance proteins [PMID: 2841293] and the omnipotent suppressor protein 2 from yeast.

In both prokaryotes and eukaryotes, there are three distinct types of elongation factors, EF-1alpha (EF-Tu), which binds GTP and an aminoacyl-tRNAand delivers the latter to the A site of ribosomes; EF-1beta (EF-Ts), which interacts with EF-1a/EF-Tu to displace GDP and thus allows the regeneration of GTP-EF-1a; and EF-2 (EF-G), which binds GTP and peptidyl-tRNA and translocates the latter from the A site to the P site. In EF-1-alpha, a specific region has been shown [PMID: 3126836] to be involved in a conformational change mediated by the hydrolysis of GTP to GDP. This region is conserved in both EF-1alpha/EF-Tu as well as EF-2/EF-G and thus seems typical for GTP-dependent proteins which bind non-initiator tRNAs to the ribosome. The GTP-binding protein synthesis factor family also includes the eukaryotic peptide chain release factor GTP-binding subunits [PMID: 7556078] and prokaryotic peptide chain release factor 3 (RF-3) [PMID: 7737996]; the prokaryotic GTP-binding protein lepA and its homologue in yeast (GUF1) and Caenorhabditis elegans (ZK1236.1); yeast HBS1 [PMID: 1394434]; rat statin S1 [PMID: 1709933]; and the prokaryotic selenocysteine-specific elongation factor selB [PMID: 2531290].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0005525 GTP binding
GO:0003924 GTPase activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE patterns