Allows the formation of correctly charged Gln-tRNA(Gln) through the transamidation of misacylated Glu-tRNA(Gln) in the mitochondria. The reaction takes place in the presence of glutamine and ATP through an activated gamma-phospho-Glu-tRNA(Gln). . This is the function of Ensembl gene identifier ENSG00000130348 (QRSL1, glutaminyl-tRNA amidotransferase subunit QRSL1).