Engineering a Cytochrome P450 for Demethylation of Lignin-Derived Aromatic Aldehydes.

Engineering a Cytochrome P450 for Demethylation of Lignin-Derived Aromatic Aldehydes.
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DOI:
10.1021/jacsau.0c00103
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发表时间:
2021-03-22
期刊:
影响因子:
8
通讯作者:
DuBois JL
DuBois JL
中科院分区:
其他
文献类型:
--
作者:
Ellis ES;Hinchen DJ;Bleem A;Bu L;Mallinson SJB;Allen MD;Streit BR;Machovina MM;Doolin QV;Michener WE;Johnson CW;Knott BC;Beckham GT;McGeehan JE;DuBois JL

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Biological funneling of lignin-derived aromatic compounds is a promising approach for valorizing its catalytic depolymerization products. Industrial processes for aromatic bioconversion will require efficient enzymes for key reactions, including demethylation of O-methoxy-aryl groups, an essential and often rate-limiting step. The recently characterized GcoAB cytochrome P450 system comprises a coupled monoxygenase (GcoA) and reductase (GcoB) that catalyzes oxidative demethylation of the O-methoxy-aryl group in guaiacol. Here, we evaluate a series of engineered GcoA variants for their ability to demethylate o-and p-vanillin, which are abundant lignin depolymerization products. Two rationally designed, single amino acid substitutions, F169S and T296S, are required to convert GcoA into an efficient catalyst toward the o- and p-isomers of vanillin, respectively. Gain-of-function in each case is explained in light of an extensive series of enzyme-ligand structures, kinetic data, and molecular dynamics simulations. Using strains of Pseudomonas putida KT2440 already optimized for p-vanillin production from ferulate, we demonstrate demethylation by the T296S variant in vivo. This work expands the known aromatic O-demethylation capacity of cytochrome P450 enzymes toward important lignin-derived aromatic monomers.
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