| PF01409 | tRNA synthetases class II core domain (F) (tRNA-synt_2d) | tRNA synthetases class II core domain (F) | Other tRNA synthetase sub-families are too dissimilar to be included. This family includes only phenylalanyl-tRNA synthetases. This is the core catalytic domain. | Domain |
| PF03483 | B3/4 domain (B3_4) | B3/4 domain | This domain is found in tRNA synthetase beta subunits as well as in some non tRNA synthetase proteins. | Domain |
| PF03484 | tRNA synthetase B5 domain (B5) | tRNA synthetase B5 domain | This domain is found in phenylalanine-tRNA synthetase beta subunits. | Domain |
| PF17759 | Phenylalanyl tRNA synthetase beta chain CLM domain (tRNA_synthFbeta) | Phenylalanyl tRNA synthetase beta chain CLM domain | This domain corresponds to the catalytic like domain (CLM) in the beta chain of phe tRNA synthetase [1]. | Domain |