Enzymatic degradation of algal 1,3-xylan: from synergism of lytic polysaccharide monooxygenases with ß-1,3-xylanases to their intelligent immobilization on biomimetic silica nanoparticles.
Appl Microbiol Biotechnol
; 104(12): 5347-5360, 2020 Jun.
Article
em En
| MEDLINE
| ID: mdl-32318768
ABSTRACT
Lytic polysaccharide monooxygenases (LPMOs) with synergistic effect on polysaccharide hydrolase represent a revolution in biotechnology, which may accelerate the conversion of biomass to the second-generation biofuels. Discovering more hydrolases that have synergism with LPMOs will considerably expand the knowledge and application of biomass degradation. The LPMOs named CgAA9 were verified to exhibit 1.52-fold synergism when incubated with ß-1,3-xylanase at a molar ratio of 31. The ion chromatography results proved that CgAA9 did not alter the endogenous hydrolysis mode of ß-1,3-xylanase. Meanwhile, to decrease the operational cost of enzymes, a novel strategy for immobilizing LPMOs and ß-1,3-xylanases based on the biomimetic silica nanoparticles was developed. It enabled preparation of immobilized enzymes directly from the cell lysate. The immobilization efficiency and activity recovery reached 84.6 and 81.4%. They showed excellent reusability for 12 cycles by retaining 68% of initial activity. The optimum temperature for both free and immobilized biocatalyst were 40 and 37 °C, indicating they were ideal candidates for typical simultaneous saccharification and fermentation (SSF) in ethanol production from algea biomass. This was the first report on the synergy between LPMOs and ß-1,3-xylanase, and the strategy for enzyme self-immobilization was simple, timesaving, and efficient, which might have great potentials in algae biomass hydrolysis. KEY POINTS ⢠The lytic polysaccharide monooxygenases (LPMOs) from Chaetomium globosum were firstly verified to boost the hydrolysis of ß-1,3-xylanases for ß-1,3-xylan. ⢠A novel strategy for simple preparation of SpyCather-modifed silica nanopartilcles and intelligent immobilization of target enzymes from the cell lysate was proposed. ⢠The immobilized LPMOs and ß-1,3-xylanases could be reasonable alternatives for typical simultaneous saccharification and fermentation (SSF) in manipulation of algae biomass.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Xilanos
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Dióxido de Silício
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Xilano Endo-1,3-beta-Xilosidase
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Enzimas Imobilizadas
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Nanopartículas
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Oxigenases de Função Mista
Idioma:
En
Revista:
Appl Microbiol Biotechnol
Ano de publicação:
2020
Tipo de documento:
Article