title: Cloning, characterization and expression of two new polyphenol oxidase cDNAs from Agaricus bisporus.
abstract: Two new polyphenol oxidase (PPO) cDNAs (PPO3 and PPO4 cDNAs, accession numbers GQ354801 and GQ354802, respectively) were obtained by RACE-PCR from Agaricus bisporus. PPO3 cDNA was 1844 bp in length with an open reading frame of 1731 bp, while PPO4 cDNA was 2042 bp with an open reading frame of 1836 bp. PPO3 and PPO4 cDNAs, with 52% identity at the nucleic acid level, encoded a 576-amino acid protein of 66.3 kDa and 611-amino acid protein of 68.3 kDa, respectively. Mature forms of PPO3 and PPO4 were characterized after removing the specific C-terminal region and expressed in Escherichia coli BL21 (DE3) RIPL using pGEX-4T-1 vector. The expressed proteins were probed by the anti-A. bisporus PPO antibody but without PPO activity. This indicated that the recombinant mature PPO3 and mature PPO4 could not form an active center in prokaryotic expression system.
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China.
authors.forename: Jinju
authors.initials: J
authors.lastname: Wu
authors.forename: Hongbing
authors.initials: H
authors.lastname: Chen
authors.forename: Jinyan
authors.initials: J
authors.lastname: Gao
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Cheng
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Ma
mesh_terms: D000364:Agaricus / Q000201:enzymology*; D000595:Amino Acid Sequence; D016227:Benzoquinones / Q000378:metabolism; D004156:Catechol Oxidase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics / Q000302:isolation & purification; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016366:Open Reading Frames; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
chemical_list: D016227:Benzoquinones; D018076:DNA, Complementary; D004271:DNA, Fungal; D005656:Fungal Proteins; C004532:quinone; D004156:Catechol Oxidase