Biochemical Analysis of Recombinant Pea Seed Coat-Specific Polyphenol Oxidase (PeaPPO) in Relation to Various Phenolic Substrates
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| Title: | Biochemical Analysis of Recombinant Pea Seed Coat-Specific Polyphenol Oxidase (PeaPPO) in Relation to Various Phenolic Substrates |
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| Authors: | Adéla Franková, Matthias Pretzler, Jana Balarynová, Jana Sekaninová, Petra Krejčí, Petr Bednář, Sanja Ćavar Zeljković, Vladan Doupovec, Mária Škrabišová, René Lenobel, Marek Petřivalský, Annette Rompel, Petr Smýkal |
| Source: | Journal of Agricultural and Food Chemistry. 73:21754-21768 |
| Publisher Information: | American Chemical Society (ACS), 2025. |
| Publication Year: | 2025 |
| Subject Terms: | Recombinant Proteins/metabolism, Kinetics, 301303 Medizinische Biochemie, 104009 Lebensmittelchemie, 104009 Food chemistry, Seeds/enzymology, Phenols/metabolism, 301303 Medical biochemistry, Catechol Oxidase/metabolism, Plant Proteins/genetics, Pisum sativum/enzymology, Substrate Specificity |
| Description: | The seed coat serves as the primary protective barrier, offering mechanical and chemical defense for the embryo. It contains various metabolites, including phenolic compounds, which can be oxidized by polyphenol oxidase (PPO) to form oligomers. In this study, we heterologously expressed a 515 amino acid protein derived from wild pea (Pisum elatius), omitting its N-terminal signal sequence, and analyzed its biochemical properties. The recombinant PeaPPO required sodium dodecyl sulfate (SDS) for activation and exhibited activity between pHs 5.2 and 7.0, peaking at pH 6.0 with 0.25 mM SDS. Tropolone and its isomer thujaplicin were the most effective inhibitors. PeaPPO catalyzed reactions with seed coat-derived substrates, displaying activity toward phenols, catechols, and pyrogallols, with the highest affinity for catechols. Principal component analysis of LC-MS/MS-derived phenolic profiles demonstrated that PPO+ and ppo- genotypes differ significantly in their accumulation of PPO substrates and inhibitors. These findings confirm that PeaPPO possesses both monophenolase and catechol oxidase activities, identifying it as a tyrosinase. |
| Document Type: | Article |
| Language: | English |
| ISSN: | 1520-5118 0021-8561 |
| DOI: | 10.1021/acs.jafc.5c01839 |
| Access URL: | https://ucrisportal.univie.ac.at/de/publications/a656c1ed-b09b-49f5-b696-b30729e9f99c https://doi.org/10.1021/acs.jafc.5c01839 |
| Rights: | CC BY |
| Accession Number: | edsair.doi.dedup.....fadaf629721b2b6ca062a89e3d511e4f |
| Database: | OpenAIRE |
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