The AARS1 protein facilitates the two-step process of attaching alanine to tRNA (Ala) : first, alanine is activated by ATP to form Ala-AMP, and then it is transferred to the acceptor end of tRNA (Ala) . AARS1 also corrects incorrectly charged tRNA (Ala) through its editing domain. AARS1 Protein, Mouse (sf9, His, solution) is the recombinant mouse-derived AARS1 protein, expressed by Sf9 insect cells , with C-His labeled tag.