title: Accelerated degradation of lignin by lignin peroxidase isozyme H8 (LiPH8) from Phanerochaete chrysosporium with engineered 4-O-methyltransferase from Clarkia breweri.
abstract: Free-hydroxyl phenolic units can decrease or even abort the catalytic activity of lignin peroxidase H8 during oxidation of veratryl alcohol and model lignin dimers, resulting in slow and inefficient lignin degradation. In this study we applied engineered 4-O-methyltransferase from Clarkia breweri to detoxify the inhibiting free-hydroxyl phenolic groups by converting them to methylated phenolic groups. The multistep, enzyme-catalyzed process that combines 4-O-methyltransferase and lignin peroxidase H8 suggested in this work can increase the efficiency of lignin-degradation. This study also suggests approaching the field of multi-enzyme in vitro systems to improve the understanding and development of plant biomass in biorefinery operations.
authors.affiliation: Department of Chemical Engineering, Kwangwoon University, 447-1, Wolgye-Dong, Nowon-Gu, Seoul 139-701, Republic of Korea.
authors.forename: Le Thanh Mai
authors.initials: le TM
authors.lastname: Pham
authors.affiliation: Department of Chemical Engineering, Kwangwoon University, 447-1, Wolgye-Dong, Nowon-Gu, Seoul 139-701, Republic of Korea. Electronic address: metalkim@kw.ac.kr.
authors.forename: Yong Hwan
authors.initials: YH
authors.lastname: Kim
mesh_terms: D001592:Benzyl Alcohols / Q000378:metabolism; D001673:Biodegradation, Environmental; D018533:Biomass; D031663:Clarkia / Q000201:enzymology* / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism; D008031:Lignin / Q000378:metabolism*; D008780:Methyltransferases / Q000235:genetics / Q000378:metabolism*; D010544:Peroxidases / Q000235:genetics / Q000378:metabolism*; D020075:Phanerochaete / Q000201:enzymology* / Q000235:genetics; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D015202:Protein Engineering; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D001592:Benzyl Alcohols; D005656:Fungal Proteins; D007527:Isoenzymes; D010940:Plant Proteins; D011994:Recombinant Proteins; D008031:Lignin; D010544:Peroxidases; C042858:lignin peroxidase; D008780:Methyltransferases; C477811:isoeugenol-O-methyltransferase; C042197:veratryl alcohol
keywords: Free-hydroxyl phenolic group; Lignin peroxidase; Lignin-degradation; O-Methyltransferase