title: Purification and characterization of an endoglucanase from the marine rotifer, Brachionus plicatilis.
abstract: The marine rotifer, Brachionus plicatilis, is able to digest Chlorella efficiently, suggesting that the rotifer contains a powerful cellulolytic enzyme system. A multi-component cellulolytic complex, including endoglucanase (CM-cellulase), cellobiohydrolase and beta-glucosidase, was found in Brachionus plicatilis. Endoglucanase (endo-beta-1,4 glucanase) was purified to homogeneity from rotifer homogenates using a sequential chromatographic method. The purified enzyme exhibits a strong hydrolytic activity with carboxymethyl(CM)-cellulose. The optimum temperature and pH for the endoglucanase activity were 37 degrees C and 7.0, respectively. 80% of the CM-cellulase activity was retained in salt mixture that ranged from 150 to 500 mM NaCl equivalent. The purified protein was isolated with a molecular weight of approximately 62 kDa estimated by SDS-polyacrylamide gel electrophoresis.
authors.affiliation: Department of Microbiology, Pukyong National University, Pusan, Korea.
authors.forename: C Z
authors.initials: CZ
authors.lastname: Chun
authors.forename: S B
authors.initials: SB
authors.lastname: Hur
authors.forename: Y T
authors.initials: YT
authors.lastname: Kim
mesh_terms: D000818:Animals; D002266:Carboxymethylcellulose Sodium / Q000378:metabolism; D002480:Cellulase / Q000302:isolation & purification* / Q000378:metabolism; D043366:Cellulose 1,4-beta-Cellobiosidase; D002845:Chromatography; D002850:Chromatography, Gel; D017886:Durapatite; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008970:Molecular Weight; D012403:Rotifera / Q000201:enzymology*; D013696:Temperature; D001617:beta-Glucosidase / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D017886:Durapatite; D001617:beta-Glucosidase; D002480:Cellulase; D043366:Cellulose 1,4-beta-Cellobiosidase; D002266:Carboxymethylcellulose Sodium