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phenylalanyl-tRNA synthetase, alpha subunit Most phenylalanyl-tRNA synthetases are heterodimeric, with 2 alpha (pheS) and 2 beta (pheT) subunits. This model describes the alpha subunit, which shows some similarity to class II aminoacyl-tRNA ligases. Mitochondrial phenylalanyl-tRNA synthetase is a single polypeptide chain, active as a monomer, and similar to this chain rather than to the beta chain, but excluded from this model. An interesting feature of the alignment of all sequences captured by this model is a deep split between non-spirochete bacterial examples and all other examples; supporting this split is a relative deletion of about 50 residues in the former set between two motifs well conserved throughout the alignment. [Protein synthesis, tRNA aminoacylation]
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Jiyao W et al.(2023). "The conserved domain database in 2023.",