methyltetrahydrofolate:corrinoid/iron-sulfur protein methyltransferase activity
methylthiol:coenzyme M methyltransferase activity
monomethylamine methyltransferase activity
mycinamicin VI 2''-O-methyltransferase activity
myricetin 7-O-methyltransferase activity
N-methyltransferase activity +
naringenin 7-O-methyltransferase activity
O-methyltransferase activity +
P-methyltransferase activity
precorrin-6A synthase (deacetylating) activity
protein methyltransferase activity +
protein-(glutamine-N5) methyltransferase activity
Catalysis of the reaction: S-adenosyl-L-methionine + a [release factor]-L-glutamine = S-adenosyl-L-homocysteine + H+ + a [release factor]-N5-methyl-L-glutamine.