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.
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This work was supported by the National High Technology Research and Development Program of China (863 Program) (No.2006AA10Z324) and Goal-oriented Project of State Key Laboratory of Food Science and Technology, Nanchang University (No. SKLF-MB-200807).
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Wu, J., Chen, H., Gao, J. et al. Cloning, characterization and expression of two new polyphenol oxidase cDNAs from Agaricus bisporus . Biotechnol Lett 32, 1439–1447 (2010). https://doi.org/10.1007/s10529-010-0329-2
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DOI: https://doi.org/10.1007/s10529-010-0329-2