title: Purification and general properties of pectin methyl esterase from Curvularia inaequalis NRRL 13884 in solid state culture using orange peels as an inducer.
abstract: Pectin methyl esterase (PME) [E.C.3. 1.1.11] production by Curvularia inaequalis (Shear) Boedijn NRRL 13884 was investigated using solid-state culture. The highest level of extracellular pectin methyl esterase was detected with orange peels as an inducing substrate and as a sole carbon source. The enzyme was partially purified using Sephadex G-100 and DEAE-Cellulose column chromatography. It was purified about 40 fold with optimum activity at pH 4.4 and 45 degrees C. The enzyme was activated by Co++, Mg++, Na+, whereas it was slightly activated in the presence of Cu++, K+, Mn++, Zn++. On the other hand Ag++, Ca++ and Hg++ inhibited the activity of the enzyme. The Km was calculated to be 0.52 mM.
authors.affiliation: Department of Biological Sciences, Faculty of Education, Ain Shams University, Heliopolis, Roxy, Cairo, Egypt.
authors.forename: A F
authors.initials: AF
authors.lastname: Afifi
authors.forename: E M
authors.initials: EM
authors.lastname: Fawzi
authors.forename: M A
authors.initials: MA
authors.lastname: Foaad
mesh_terms: D001203:Ascomycota / Q000201:enzymology* / Q000378:metabolism; D002265:Carboxylic Ester Hydrolases / Q000302:isolation & purification* / Q000378:metabolism*; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D032084:Citrus sinensis / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D013696:Temperature
chemical_list: D002265:Carboxylic Ester Hydrolases; C022323:pectinesterase