title: Gene cloning of cellobiohydrolase II from the white rot fungus Irpex lacteus MC-2 and its expression in Pichia pastoris.
abstract: A gene (cel4) coding for a cellobiohydrolase II (Ex-4) was isolated from the white rot basidiomycete, Irpex lacteus strain MC-2. The cel4 ORF was composed of 452 amino acid residues and was interrupted by eight introns. Its deduced amino acid sequence revealed a multi domain structure composed of a cellulose-binding domain, a linker, and a catalytic domain belonging to family 6 of glycosyl hydrolases, from the N-terminus. cel4 cDNA was successfully expressed in the yeast Pichia pastoris. Recombinant Ex-4 showed endo-processive degrading activity towards cellulosic substrates, and a synergistic effect in the degradation of Avicel was observed when the enzyme acted together with either cellobiohydrolase I (Ex-1) or endoglucanase (En-1) produced by I. lacteus MC-2.
authors.affiliation: Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Toda
authors.forename: Naoki
authors.initials: N
authors.lastname: Nagahata
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Amano
authors.forename: Kouichi
authors.initials: K
authors.lastname: Nozaki
authors.forename: Takahisa
authors.initials: T
authors.lastname: Kanda
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Okazaki
authors.forename: Makoto
authors.initials: M
authors.lastname: Shimosaka
mesh_terms: D000595:Amino Acid Sequence; D001487:Basidiomycota / Q000201:enzymology*; D002482:Cellulose / Q000378:metabolism; D043366:Cellulose 1,4-beta-Cellobiosidase / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D003001:Cloning, Molecular; D005656:Fungal Proteins / Q000737:chemistry; D015870:Gene Expression; D006026:Glycoside Hydrolases / Q000737:chemistry; D008969:Molecular Sequence Data; D010843:Pichia / Q000235:genetics*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D017422:Sequence Analysis, DNA
chemical_list: D005656:Fungal Proteins; D011994:Recombinant Proteins; D002482:Cellulose; D006026:Glycoside Hydrolases; C035212:driselase; D043366:Cellulose 1,4-beta-Cellobiosidase