Transcription factor, GTP-binding domain (IPR000795)

Short name: TF_GTP-bd_dom

Overlapping homologous superfamilies

Domain relationships


The translational GTPases are the Bacteria elongation factors, EFTu, EFG, and the initiation factor, IF2, and their archaeal homologues, the EF1, EF2, aeIF5b and aeIF2. They all contain two homologous N-terminal domains: a GTPase or G-domain, followed by an OB-domain. These translational proteins' G-domains are both structurally and functionally related to a larger family of GTPase G proteins [PMID: 11916378].

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 profiles