Subunit of the N6-methyltransferase complex, a multiprotein complex that mediates N6-methyladenosine (m6A) methylation at the 5'-[AG]GAC-3' consensus sites of some mRNAs (PubMed:28503769). Associates with MTA, MTB, FIP37 and HAKAI to form the m6A writer complex which is essential for adenosine methylation at specific mRNA sequences (PubMed:28503769). N6-methyladenosine (m6A) plays a role in mRNA stability, processing, translation efficiency and editing (PubMed:28503769). Interacts with MTB, FIP37 and HAKAI (PubMed:28503769). Associates with MTA, MTB, FIP37 and HAKAI to form the m6A writer complex which is essential for adenosine methylation at specific mRNA sequences (PubMed:28503769). Embryonic lethality due to embryo development arrest at globular stage. Plants silencing VIR exhibit pleiotropic phenotypes, including aberrant root cap formation, gravity response and lateral root development, and defective development of cotyledons. Belongs to the vir family.