title: Cloning of a gene encoding dextranase from Lipomyces starkeyi and its expression in Pichia pastoris.
abstract: A gene (lsd1) encoding dextranase from Lipomyces starkeyi KSM22 has been previously cloned, sequenced, and expressed in Saccharomyces cerevisiae. The gene consisting of 1,824 base pairs and encoding a protein of 608 amino acids was then cloned into and secretively expressed in Pichia pastoris under the control of the AOX1 promoter. The dextranase productivity of the P. pastoris transformant (pPIC9K-LSD1, 134,000 U/l) was approximately 4.2-fold higher than that of the S. cerevisiae transformant (pYLSD1, 32,000 U/l) cultured in an 8-l fermentor. Over 0.63 g/l of active dextranase was secreted into the medium after methanol induction. The dextranase of the P. pastoris transformant, as analyzed by SDS-PAGE and Western blotting, showed only one homogeneous band. This dextranase of the P. pastoris transformant showed a broad band near 73 kDa. Rabbit monoclonal antibodies against a synthetic LSD1 peptide mix also recognized approximately 73 kDa.
authors.affiliation: School of Biological Sciences and Technology, Chonnam National University, Gwang-ju 500-757, Korea.
authors.forename: Hee-Kyoung
authors.initials: HK
authors.lastname: Kang
authors.forename: Ji-Young
authors.initials: JY
authors.lastname: Park
authors.forename: Joon-Seob
authors.initials: JS
authors.lastname: Ahn
authors.forename: Seung-Heuk
authors.initials: SH
authors.lastname: Kim
authors.forename: Doman
authors.initials: D
authors.lastname: Kim
mesh_terms: D003001:Cloning, Molecular; D003910:Dextranase / Q000235:genetics / Q000378:metabolism*; D005285:Fermentation; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D055160:Lipomyces / Q000235:genetics* / Q000378:metabolism; D010843:Pichia / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D005656:Fungal Proteins; D011994:Recombinant Proteins; D003910:Dextranase