ID 2.1.1.53 DE putrescine N-methyltransferase. CA putrescine + S-adenosyl-L-methionine = H(+) + N-methylputrescine + CA S-adenosyl-L-homocysteine. DR Q93XQ5, PMT1_NICAT ; Q42963, PMT1_TOBAC ; Q93XQ4, PMT2_NICAT ; DR Q9SEH7, PMT2_TOBAC ; A0A314LG79, PMT3_NICAT ; Q9SEH5, PMT3_TOBAC ; DR Q9SEH4, PMT4_TOBAC ; //