title: A long-wavelength fluorescent substrate for continuous fluorometric determination of cellulase activity: resorufin-beta-D-cellobioside.
abstract: A simple and reliable continuous assay procedure for measurement of cellulase activity from several species using the new substrate resorufin-beta-D-cellobioside (Res-CB) has been developed. The product of enzyme reaction, resorufin, exhibits fluorescence emission at 585 nm with excitation at 571 nm and has a pK(a) of 5.8, which allows continuous measurement of fluorescence turnover at or near physiological pH values. The assay performed using purified cellulase from the microscopic fungus Trichoderma reesei has been shown to give the kinetic parameters K(m) of 112 microM and V(max) of 0.000673 micromol/mL/min. Methods for performing the assay using cellulases isolated from both live Arabidopsis thaliana plant and Aspergillus niger fungal species are presented.
authors.affiliation: Marker Gene Technologies, Inc., University of Oregon Riverfront Research Park, 1850 Millrace Dr., Eugene, OR 97403, USA.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Coleman
authors.forename: Missy J
authors.initials: MJ
authors.lastname: Studler
authors.forename: John J
authors.initials: JJ
authors.lastname: Naleway
mesh_terms: D017360:Arabidopsis / Q000201:enzymology; D001234:Aspergillus niger / Q000201:enzymology; D002475:Cellobiose / Q000031:analogs & derivatives / Q000737:chemistry; D002478:Cells, Cultured; D002480:Cellulase / Q000378:metabolism*; D004187:Disaccharides / Q000138:chemical synthesis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010078:Oxazines / Q000138:chemical synthesis / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013997:Time Factors
chemical_list: D004187:Disaccharides; D005456:Fluorescent Dyes; D010078:Oxazines; C526627:resorufin-beta-D-cellobioside; D002475:Cellobiose; C014180:resorufin; D002480:Cellulase