Homologous Superfamily

Aspartyl/glutamyl-tRNA(Asn/Gln) amidotransferase subunit B, C-terminal (IPR023168)

Short name: GatB_Yqey_C

Overlapping entries


Glutamyl-tRNA(Gln) amidotransferase (Gat; EC:6.3.5) provides a means of producing correctly charged Gln-tRNA(Gln) through the transamidation of mis-acylated Glu-tRNA(Gln) in organisms which lack glutaminyl-tRNA synthetase [PMID: 9342321]. The reaction takes place in the presence of glutamine and ATP through an activated gamma-phospho-Glu-tRNA(Gln). The enzyme is composed of three subunits: A (an amidase), B and C. It also exists in eukaryotes as a protein targeted to the mitochondria.

The heterotrimer GatABC is involved in converting Glu to Gln and/or Asp to Asn, when the amino acid is attached to the appropriate tRNA. In Lactobacillus, GatABC is responsible for producing tRNA(Gln). In Archaea, GatABC is responsible for producing tRNA(Asn), while GatDE is responsible for producing tRNA(Gln). In lineages that include Thermus, Chlamydia, or Acidithiobacillus, the GatABC complex catalyses both tRNA(Gln) and tRNA(Asn).

This entry represents the extreme C-terminal structural domain of GatB and GatE subunits. It forms a predominantly alpha-helical structure.

Contributing signatures

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