title: Further stabilization of earthworm serine protease by chemical modification and immobilization.
abstract: Earthworm serine protease is more stable and is less affected by organic solvents and detergent than other proteases. However, it is inactivated, probably by autolysis, at 60 degrees C or above under alkaline conditions. Further stabilization was managed by chemical modification of the enzyme with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and phenylglyoxal to protect the activity from the autolytic inactivation. Stabilization was possible also under acidic conditions, in which the stability of the enzyme was rather low, by immobilization with folded sheet mesoporous material. Thus, further stabilization of the enzyme has been achieved by chemical modification or immobilization.
authors.affiliation: Department of Nutritional Science, Faculty of Health and Welfare Science, Okayama Prefectural University, Soja, Okayama 719-1197, Japan. nakajima@fhw.oka-pu.ac.jp
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Nakajima
authors.forename: Kohji
authors.initials: K
authors.lastname: Ishihara
authors.forename: Manabu
authors.initials: M
authors.lastname: Sugimoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakahara
authors.forename: Hideaki
authors.initials: H
authors.lastname: Tsuji
mesh_terms: D000818:Animals; D002234:Carbodiimides / Q000737:chemistry; D004800:Enzymes, Immobilized / Q000737:chemistry* / Q000378:metabolism*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D009835:Oligochaeta / Q000201:enzymology*; D010658:Phenylglyoxal / Q000737:chemistry; D012697:Serine Endopeptidases / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D002234:Carbodiimides; D004800:Enzymes, Immobilized; C074139:1-ethyl-3-(3-dimethylaminoethyl)carbodiimide; D012697:Serine Endopeptidases; D010658:Phenylglyoxal