In enzymology, a 6-O-methylnorlaudanosoline 5'-O-methyltransferase (EC number 2.1.1.121) is an enzyme that catalyzes the chemical reaction:
Thus, the two substrates of this enzyme are S-adenosyl methionine and 6-O-methylnorlaudanosoline, whereas its two products are S-adenosylhomocysteine and nororientaline.
This enzyme is produced by the flowering plant Argemone platyceras and it participates in alkaloid biosynthesis.
This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:6-O-methylnorlaudanosoline 5'-O-methyltransferase.