Methyltransferase that performs automethylation (By similarity). No other methyl-accepting substrate has been identified yet (By similarity). Component of the velvet transcription factor complex that acts as a global regulator for secondary metabolite gene expression (PubMed:26466873). Controls the expression of the cyclopiazonic acid (CPA) gene clusters (PubMed:26466873). Regulates also pigmentation and conidial head morphology (PubMed:26466873). L-methionyl-[protein] + S-adenosyl-L-methionine = S-adenosyl-L-homocysteine + S-methyl-L-methionyl-[protein] Component of the heterotrimeric velvet complex composed of laeA, veA and velB; VeA acting as a bridging protein between laeA and velB (By similarity). Belongs to the methyltransferase superfamily. LaeA methyltransferase family.