Enables site-specific DNA-methyltransferase (adenine-specific) activity. Involved in DNA methylation on adenine and regulation of chromatin organization. Predicted to be located in mitochondrial matrix. Predicted to be active in cytosol and nucleus. Orthologous to human METTL4 (methyltransferase 4, N6-adenosine). [provided by Alliance of Genome Resources, Apr 2022]