Domain

Translation elongation factor EFTu/EF1A, domain 2 (IPR004161)

Short name: Transl_elong_EFTu/EF1A_2

Domain relationships

Description

Translation elongation factors are responsible for two main processes during protein synthesis on the ribosome [PMID: 12762045, PMID: 15922593, PMID: 12932732]. EF1A (or EF-Tu) is responsible for the selection and binding of the cognate aminoacyl-tRNA to the A-site (acceptor site) of the ribosome. EF2 (or EF-G) is responsible for the translocation of the peptidyl-tRNA from the A-site to the P-site (peptidyl-tRNA site) of the ribosome, thereby freeing the A-site for the next aminoacyl-tRNA to bind. Elongation factors are responsible for achieving accuracy of translation and both EF1A and EF2 are remarkably conserved throughout evolution.

EF1A (also known as EF-1alpha or EF-Tu) is a G-protein. It forms a ternary complex of EF1A-GTP-aminoacyltRNA. The binding of aminoacyl-tRNA stimulates GTP hydrolysis by EF1A, causing a conformational change in EF1A that causes EF1A-GDP to detach from the ribosome, leaving the aminoacyl-tRNA attached at the A-site. Only the cognate aminoacyl-tRNA can induce the required conformational change in EF1A through its tight anticodon-codon binding [PMID: 15680978, PMID: 12102560]. EF1A-GDP is returned to its active state, EF1A-GTP, through the action of another elongation factor, EF1B (also known as EF-Ts or EF-1beta/gamma/delta).

EF1A consists of three structural domains. This entry represents domain 2 of EF2, which adopts a beta-barrel structure, and is involved in binding to both charged tRNA [PMID: 7491491]. This domain is structurally related to the C-terminal domain of EF2 (IPR004160), to which it displays weak sequence matches. This domain is also found in other proteins such as translation initiation factor IF-2 and tetracycline-resistance proteins.

More information about these proteins can be found at Protein of the Month: Elongation Factors [].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0005525 GTP binding

Cellular Component

No terms assigned in this category.

Contributing signatures

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