title: Protodioscin-glycosidase-1 hydrolyzing 26-O-β-D-glucoside and 3-O-(1 → 4)-α-L-rhamnoside of steroidal saponins from Aspergillus oryzae.
abstract: A novel protodioscin-(steroidal saponin)-glycoside hydrolase, named protodioscin-glycosidase-1 (PGase-1), was purified and characterized from the Aspergillus oryzae strain. The molecular mass of this enzyme was determined to be about 55 kDa based on SDS-polyacrylamide gel electrophoresis. PGase-1 was able to hydrolyze the terminal 26-O-β-D-glucopyranoside of protodioscin (furostanoside) to produce dioscin (spirostanoside), and then further hydrolyze the terminal 3-O-(1 → 4)-α-L-rhamnopyranoside of dioscin to form progenin III. However, PGase-1 could hardly hydrolyze the 3-O-(1 → 2)-α-L-rhamnopyranoside of progenin III, 3-O-β-D-glucoside of trillin, and the 1-O-glycosides of ophiopogonin D (steroidal saponin). In addition, PGase-1 also could hydrolyze the α-D-galactopyranoside, β-D-glucopyranoside, and β-D-galactopyranoside of p-nitrophenyl-glycosides, but the enzyme could not hydrolyze the α-D-mannopyranoside, α-L-arabinopyranoside, α-D-glucopyranoside, β-D-xylopyranoside, and α-L-rhamnopyranoside of p-nitrophenyl-glycosides. These new properties of PGase-1 were significantly different from those of previously described steroidal saponin-glycosidases and the glycosidases currently described in Enzyme Nomenclature by the NC-IUBMB. The gene (termed as pgase-1) encoding PGase-1 was cloned, sequenced, and expressed in Pichia pastoris GS115. The complete nucleotide sequence of pgase-1 consists of 1,725 bp. The recombinant PGase-1 from recombinant P. pastoris GS115 strain also showed the activity hydrolyzing glycosides of steroidal saponins which was similar to that of the wild-type PGase-1 from A. oryzae. The PGase-1 gene is highly similar to Aspergilli α-amylase (EC 3.2.1.1), and PGase-1 should be classified as glycoside hydrolase family 13 by the method of gene sequence-based classification. But the enzyme properties of PGase-1 are different from those of α-amylase in this family.
authors: College of Science, Yanbian University, Yanji City, 133002, People's Republic of China.
authors: Tingqiang
authors: T
authors: Liu
authors: Hongshan
authors: H
authors: Yu
authors: Chunying
authors: C
authors: Liu
authors: Yuanhao
authors: Y
authors: Wang
authors: Minqian
authors: M
authors: Tang
authors: Xiaodong
authors: X
authors: Yuan
authors: Ning
authors: N
authors: Luo
authors: Qingyu
authors: Q
authors: Wang
authors: Xiaodong
authors: X
authors: Xu
authors: Fengxie
authors: F
authors: Jin
mesh_terms: D001236:Aspergillus oryzae / Q000737:chemistry / Q000201:enzymology* / Q000235:genetics; D001711:Biotransformation; D003001:Cloning, Molecular; D004144:Diosgenin / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism; D004795:Enzyme Stability; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006026:Glycoside Hydrolases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006027:Glycosides / Q000737:chemistry* / Q000378:metabolism; D006868:Hydrolysis; D008969:Molecular Sequence Data; D012503:Saponins / Q000737:chemistry* / Q000378:metabolism; D013379:Substrate Specificity
chemical_list: D005656:Fungal Proteins; D006027:Glycosides; D012503:Saponins; C459619:protodioscin; D006026:Glycoside Hydrolases; D004144:Diosgenin