Functions in trans to edit the amino acid moiety from incorrectly charged tRNA(Ala). Binds 1 zinc ion per subunit. Based on a readthrough transcript which may produce a PTGES3L-AARSD1 fusion protein. Based on a readthrough transcript which may produce a PTGES3L-AARSD1 fusion protein. Belongs to the class-II aminoacyl-tRNA synthetase family. Alax-L subfamily.