Enzyme kinetics of fungal glucuronoyl esterases on natural lignin-carbohydrate complexes
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Glucuronoyl esterases (CE15 family) enable targeted cleavage of ester linkages in lignin-carbohydrate complexes (LCCs), particularly those linking lignin and glucuronoyl residues in xylan. A substantial challenge in characterization and kinetic analysis of CE15 enzymes has been the lack of proper substrates. Here, we present an assay using an insoluble LCC-rich lignin fraction from birch; lignin-rich pellet (LRP). The assay employs quantification of enzyme reaction products by LC-MS. The kinetics of four fungal CE15 enzymes, PsGE, CuGE, TtGE, and AfuGE originating from lignocellulose-degrading fungi Punctularia strigosozonata, Cerrena unicolor, Thielavia terrestris, and Armillaria fuscipes respectively were characterized and compared using this new assay. All four enzymes had activity on LRP and showed a clear preference for the insoluble substrate compared with smaller soluble LCC mimicking esters. End-product profiles were near identical for the four enzymes but differences in kinetic parameters were observed. TtGE possesses an alternative active site compared with the three other enzymes as it has the position of the catalytic glutamic acid occupied by a serine. TtGE performed poorly compared with the other enzymes. We speculate that glucuronoyl LCCs are not the preferred substrate of TtGE. Removal of an N-terminal CBM on CuGE affected the catalytic efficiently of the enzyme by reducing Kcat by more than 30%. Reaction products were detected from all four CE15s on a similar substrate from spruce indicating a more generic GE activity not limited to the hardwood. The assay with natural substrate represents a novel tool to study the natural function and kinetics of CE15s.
KeywordsGlucuronoyl esterases CE15 LCC Glucuronoxylan Aldouronic acids Lignin
We sincerely thank Novozymes A/S for the donation of GH10 containing preparation.
This work was partly financed by the grant NNF15OC0015222 funded by the Novo Nordisk Foundation and also supported by the Bio-Value Strategic Platform for Innovation and Research, co-funded by The Danish Council for Strategic Research and The Danish Council for Technology and Innovation, case no: 0603-00522B.
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Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
- Bååth JA, Mazurkewich S, Knudsen RM, Poulsen J-CN, Olsson L, Lo Leggio L, Larsbrink J (2018) Biochemical and structural features of diverse bacterial glucuronoyl esterases facilitating recalcitrant biomass conversion. Biotechnol Biofuels 11:213. https://doi.org/10.1186/s13068-018-1213-x CrossRefGoogle Scholar
- Charavgi MD, Dimarogona M, Topakas E, Christakopoulos P, Chrysina ED (2013) The structure of a novel glucuronoyl esterase from Myceliophthora thermophila gives new insights into its role as a potential biocatalyst. Acta Crystallogr Sect D Biol Crystallogr 69:63–73. https://doi.org/10.1107/S0907444912042400 CrossRefGoogle Scholar
- d’Errico C, Jørgensen JO, Krogh KBRM, Spodsberg N, Madsen R, Monrad RN (2015) Enzymatic degradation of lignin-carbohydrate complexes (LCCs): model studies using a fungal glucuronoyl esterase from Cerrena unicolor. Biotechnol Bioeng 112:914–922. https://doi.org/10.1002/bit.25508 CrossRefGoogle Scholar
- Dilokpimol A, Mäkelä MR, Cerullo G, Zhou M, Varriale S, Gidijala L, Brás JLA, Jütten P, Piechot A, Verhaert R, Faraco V, Hilden KS, de Vries RP (2018) Fungal glucuronoyl esterases: genome mining based enzyme discovery and biochemical characterization. New Biotechnol 40:282–287. https://doi.org/10.1016/j.nbt.2017.10.003 CrossRefGoogle Scholar
- Lin M-I, Hiyama A, Kondo K, Nagata T, Katahira M (2018) Classification of fungal glucuronoyl esterases (FGEs) and characterization of two new FGEs from Ceriporiopsis subvermispora and Pleurotus eryngii. Appl Microbiol Biotechnol 102:9635–9645. https://doi.org/10.1007/s00253-018-9318-5 CrossRefGoogle Scholar
- Tang J, Long L, Cao Y, Ding S (2019) Expression and characterization of two glucuronoyl esterases from Thielavia terrestris and their application in enzymatic hydrolysis of corn bran. Appl Microbiol Biotechnol. https://doi.org/10.1007/s00253-019-09662-w
- Topakas E, Moukouli M, Dimarogona M, Vafiadi C, Christakopoulos P (2010) Functional expression of a thermophilic glucuronoyl esterase from Sporotrichum thermophile: identification of the nucleophilic serine. Appl Microbiol Biotechnol 87:1765–1772. https://doi.org/10.1007/s00253-010-2655-7 CrossRefGoogle Scholar