title: Separation of the S-adenosylmethionine: 5- and 8-hydroxyfuranocoumarin O-methyltransferases of Ruta graveolens L. by general ligand affinity chromatography.
abstract: Two S-adenosyl-L-methionine:furanocoumarin O-methyltransferases of R. graveolens, acting at the 5- and 8-hydroxyl of the psoralen nucleus, were completely resolved by adsorption on a general affinity ligand, 5-(3-carboxypropanamido) xanthotoxin, followed by specific desorption by bergaptol and xanthotoxol, respectively. The 5-O-methyltransferase was purified 450-fold by this procedure, the 8-O-methyltransferase 112-fold, and both enzyme fractions were electrophoretically homogeneous. No resolution could be achieved of the activity against two 5-hydroxypsoralens or of the activity against two 8-hydroxypsoralens, and conclusive evidence is presented for the existence of only one 5-O-methyltransferase and only one 8-O-methyltransferase acting on linear furanocoumarins.
mesh_terms: D002846:Chromatography, Affinity; D003374:Coumarins; D007527:Isoenzymes / Q000302:isolation & purification; D008780:Methyltransferases / Q000302:isolation & purification*; D010944:Plants / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D003374:Coumarins; D007527:Isoenzymes; D008780:Methyltransferases