This is the anticodon binding domain found in some phenylalanyl tRNA synthetases. The domain has a ferredoxin fold [1,2].
Aminoacyl-tRNA synthetases (aaRSs) play a crucial role in the translation of the genetic code by means of covalent attachment of amino acids to their cognate tRNAs. Phenylalanine-tRNA synthetase (PheRS, also known as Phenylalanine-tRNA ligase) is known to be among the most complex enzymes of the aaRS family. Bacterial and mitochondrial PheRSs share a ferredoxin-fold anticodon binding (FDX-ACB) domain, which represents a canonical double split alpha+beta motif having no insertions. The FDX-ACB domain displays a typical RNA recognition fold (RRM) (see PROSITEDOC) formed by the four-stranded antiparallel beta sheet, with two helices packed against it [PUBMED:7664121, PUBMED:9016717, PUBMED:10049785, PUBMED:12962494, PUBMED:18611382].
Wolf YI, Aravind L, Grishin NV, Koonin EV; , Genome Res 1999;9:689-710.: Evolution of aminoacyl-tRNA synthetases--analysis of unique domain architectures and phylogenetic trees reveals a complex history of horizontal gene transfer events. PUBMED:10447505 EPMC:10447505 .
Goldgur Y, Mosyak L, Reshetnikova L, Ankilova V, Lavrik O, Khodyreva S, Safro M; , Structure 1997;5:59-68.: The crystal structure of phenylalanyl-tRNA synthetase from thermus thermophilus complexed with cognate tRNAPhe. PUBMED:9016717 EPMC:9016717.