This domain of approximately 100 residues is conserved from plants to humans. It is frequently found in association with Lsm domain-containing proteins. It is an anticodon-binding domain of a prolyl-tRNA synthetase, whose PDB structure is available under the identifier 1h4q.

1: Novel Sm-like proteins with long C-terminal tails and associated methyltransferases. Albrecht M, Lengauer T; FEBS Lett 2004;569:18-26. PMID:15225602