Homologous Superfamily

tRNA intron endonuclease, catalytic domain-like superfamily (IPR036167)

Short name: tRNA_intron_Endo_cat-like_sf

Overlapping entries


This entry represents a three-layer alpha/beta/alpha domain found as the catalytic domain at the C-terminal in homotetrameric tRNA-intron endonucleases [PMID: 9535656], and as domains 2 and 4 (C-terminal) in the homodimeric enzymes [PMID: 16690865]. tRNA-intron endonucleases (EC: remove tRNA introns by cleaving pre-tRNA at the 5'- and 3'-splice sites to release the intron. The products are an intron and two tRNA half-molecules bearing 2',3' cyclic phosphate and 5'-hydroxyl termini [PMID: 9200602]. These enzymes recognise a pseudosymmetric substrate in which two bulged loops of three bases are separated by a stem of four bp [PMID: 14993668]. Although homotetrameric enzymes contain four active sites, only two participate in the cleavage, and should therefore, be considered as a dimer of dimers.

GO terms

Biological Process

GO:0006388 tRNA splicing, via endonucleolytic cleavage and ligation

Molecular Function

GO:0000213 tRNA-intron endonuclease activity

Cellular Component

No terms assigned in this category.

Contributing signatures

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