title: The purification and characterization of 4-hydroxy-3-methoxycinnamic (ferulic) acid esterase from Streptomyces olivochromogenes.
abstract: A 4-hydroxy-3-methoxycinnamic acid (ferulic acid) esterase has been purified from the extracellular broth of cultures of Streptomyces olivochromogenes after growth on oat splet xylan. The purification procedure utilizes ion exchange on DEAE-BioGel A, anion exchange on Mono Q, gel filtration and hydrophobic interaction chromatography. The purified enzyme appeared as a single band on SDS-PAGE, with an apparent Mr of 29,000. Two bands, at pI7.9 and 8.5, were observed on isoelectric focusing. With methyl ferulate as substrate, the pH and temperature optima were 5.5 and 30 degrees C respectively, with a Km of 1.86 mM and Vmax of 0.3 mumols min-1 mg-1. The purfied enzyme released ferulic acid from de-starched wheat bran only in the presence of xylanase.
authors.affiliation: AFRC Institute of Food Research, Norwich Laboratory, Colney, UK.
authors.forename: C B
authors.initials: CB
authors.lastname: Faulds
authors.forename: G
authors.initials: G
authors.lastname: Williamson
mesh_terms: D001426:Bacterial Proteins / Q000302:isolation & purification* / Q000378:metabolism; D002265:Carboxylic Ester Hydrolases / Q000302:isolation & purification* / Q000378:metabolism; D002473:Cell Wall / Q000378:metabolism; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004043:Dietary Fiber / Q000378:metabolism; D006026:Glycoside Hydrolases / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D007700:Kinetics; D008970:Molecular Weight; D013302:Streptomyces / Q000201:enzymology*; D043325:Xylan Endo-1,3-beta-Xylosidase
chemical_list: D001426:Bacterial Proteins; D004043:Dietary Fiber; D002265:Carboxylic Ester Hydrolases; C070196:feruloyl esterase; D006026:Glycoside Hydrolases; D043325:Xylan Endo-1,3-beta-Xylosidase