Catalytic component of the MIS complex, a complex that mediates N6-methyladenosine (m6A) methylation on some mRNAs during meiosis and is required for sporulation. M6A, which takes place on the adenosine of 5'-[AG]GAC-3' consensus sites of some mRNAs, is probably required to initiate sporulation. Positive regulator for IME2. an adenosine in mRNA + S-adenosyl-L-methionine = an N(6)-methyladenosine in mRNA + H(+) + S-adenosyl-L-homocysteine Component of the MIS complex, composed of SLZ1, MUM2 and IME4. Localizes in the nucleolus during the period of m6A mRNA accumulation. In response to starvation conditions. Belongs to the MT-A70-like family.