Catalysis of the reaction: N(6)-methyl-L-lysyl(20)-[histone H4] + S-adenosyl-L-methionine = H+ + N(6),N(6)-dimethyl-L-lysyl(20)-[histone H4] + S-adenosyl-L-homocysteine. This reaction is the addition of a methyl group to the monomethlyated lysine residue at position 20 of histone H4, producing H4K20me2.
Source:RHEA:60348
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