L-glutamine(104)-[histone H2A] + S-adenosyl-L-methionine <=> N(5)-methyl-L-glutamine(104)-[histone H2A] + S-adenosyl-L-homocysteine + H(+)
l-glutamine(104)-[histone h2a] + s-adenosyl-l-methionine <=> n(5)-methyl-l-glutamine(104)-[histone h2a] + s-adenosyl-l-homocysteine + h(+)