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Cellohexaose

Cellohexaose O-CHE
Product code: O-CHE
€195.00

10 mg

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Content: 10 mg
Shipping Temperature: Ambient
Storage Temperature: Ambient
Physical Form: Powder
Stability: > 2 years under recommended storage conditions
CAS Number: 2478-35-5
Molecular Formula: C36H62O31
Molecular Weight: 990.9
Purity: > 95%
Substrate For (Enzyme): endo-Cellulase

High purity Cellohexaose for use in research, biochemical enzyme assays and in vitro diagnostic analysis.

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Publications
Megazyme publication

Versatile high resolution oligosaccharide microarrays for plant glycobiology and cell wall research.

Pedersen, H. L., Fangel, J. U., McCleary, B., Ruzanski, C., Rydahl, M. G., Ralet, M. C., Farkas, V., Von Schantz, L., Marcus, S. E., Andersen, M.C. F., Field, R., Ohlin, M., Knox, J. P., Clausen, M. H. & Willats, W. G. T. (2012). Journal of Biological Chemistry, 287(47), 39429-39438.

Microarrays are powerful tools for high throughput analysis, and hundreds or thousands of molecular interactions can be assessed simultaneously using very small amounts of analytes. Nucleotide microarrays are well established in plant research, but carbohydrate microarrays are much less established, and one reason for this is a lack of suitable glycans with which to populate arrays. Polysaccharide microarrays are relatively easy to produce because of the ease of immobilizing large polymers noncovalently onto a variety of microarray surfaces, but they lack analytical resolution because polysaccharides often contain multiple distinct carbohydrate substructures. Microarrays of defined oligosaccharides potentially overcome this problem but are harder to produce because oligosaccharides usually require coupling prior to immobilization. We have assembled a library of well characterized plant oligosaccharides produced either by partial hydrolysis from polysaccharides or by de novo chemical synthesis. Once coupled to protein, these neoglycoconjugates are versatile reagents that can be printed as microarrays onto a variety of slide types and membranes. We show that these microarrays are suitable for the high throughput characterization of the recognition capabilities of monoclonal antibodies, carbohydrate-binding modules, and other oligosaccharide-binding proteins of biological significance and also that they have potential for the characterization of carbohydrate-active enzymes.

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Functional characterization of a lytic polysaccharide monooxygenase from Schizophyllum commune that degrades non-crystalline substrates.

Østby, H., Christensen, I. A., Hennum, K., Várnai, A., Buchinger, E., Grandal, S., Courtade, G., Hegnar, O. A., Aachmann, F. L. & Eijsink, V. G. (2023). Scientific Reports, 13(1), 17373.

Lytic polysaccharide monooxygenases (LPMOs) are mono-copper enzymes that use O2 or H2O2 to oxidatively cleave glycosidic bonds. LPMOs are prevalent in nature, and the functional variation among these enzymes is a topic of great interest. We present the functional characterization of one of the 22 putative AA9-type LPMOs from the fungus Schizophyllum commune, ScLPMO9A. The enzyme, expressed in Escherichia coli, showed C4-oxidative cleavage of amorphous cellulose and soluble cello-oligosaccharides. Activity on xyloglucan, mixed-linkage β-glucan, and glucomannan was also observed, and product profiles differed compared to the well-studied C4-oxidizing NcLPMO9C from Neurospora crassa. While NcLPMO9C is also active on more crystalline forms of cellulose, ScLPMO9A is not. Differences between the two enzymes were also revealed by nuclear magnetic resonance (NMR) titration studies showing that, in contrast to NcLPMO9C, ScLPMO9A has higher affinity for linear substrates compared to branched substrates. Studies of H2O2-fueled degradation of amorphous cellulose showed that ScLPMO9A catalyzes a fast and specific peroxygenase reaction that is at least two orders of magnitude faster than the apparent monooxygenase reaction. Together, these results show that ScLPMO9A is an efficient LPMO with a broad substrate range, which, rather than acting on cellulose, has evolved to act on amorphous and soluble glucans.

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New colours for old in the blue-cheese fungus Penicillium roqueforti.

Cleere, M. M., Novodvorska, M., Geib, E., Whittaker, J., Dalton, H., Salih, N., Hewitt, S., Kokolski, M. Brock, M. & Dyer, P. S. (2024). npj Science of Food, 8(1), 3.

Penicillium roqueforti is used worldwide in the production of blue-veined cheese. The blue-green colour derives from pigmented spores formed by fungal growth. Using a combination of bioinformatics, targeted gene deletions, and heterologous gene expression we discovered that pigment formation was due to a DHN-melanin biosynthesis pathway. Systematic deletion of pathway genes altered the arising spore colour, yielding white to yellow-green to red-pink-brown phenotypes, demonstrating the potential to generate new coloured strains. There was no consistent impact on mycophenolic acid production as a result of pathway interruption although levels of roquefortine C were altered in some deletants. Importantly, levels of methyl-ketones associated with blue-cheese flavour were not impacted. UV-induced colour mutants, allowed in food production, were then generated. A range of colours were obtained and certain phenotypes were successfully mapped to pathway gene mutations. Selected colour mutants were subsequently used in cheese production and generated expected new colourations with no elevated mycotoxins, offering the exciting prospect of use in future cheese manufacture.

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AA16 Oxidoreductases Boost Cellulose-Active AA9 Lytic Polysaccharide Monooxygenases from Myceliophthora thermophila

Sun, P., Huang, Z., Banerjee, S., Kadowaki, M. A., Veersma, R. J., Magri, S., Hilgers, R., Muderspach, S. J., Laurent, C. V. F. P., Ludwig, R., Cannella, D., Leggio, L. L., van Berkel, W. J. H. & Kabel, M. A. (2023). ACS Catalysis, 13, 4454-4467.

Copper-dependent lytic polysaccharide monooxygenases (LPMOs) classified in Auxiliary Activity (AA) families are considered indispensable as synergistic partners for cellulolytic enzymes to saccharify recalcitrant lignocellulosic plant biomass. In this study, we characterized two fungal oxidoreductases from the new AA16 family. We found that MtAA16A from Myceliophthora thermophila and AnAA16A from Aspergillus nidulans did not catalyze the oxidative cleavage of oligo- and polysaccharides. Indeed, the MtAA16A crystal structure showed a fairly LPMO-typical histidine brace active site, but the cellulose-acting LPMO-typical flat aromatic surface parallel to the histidine brace region was lacking. Further, we showed that both AA16 proteins are able to oxidize low-molecular-weight reductants to produce H2O2. The oxidase activity of the AA16s substantially boosted cellulose degradation by four AA9 LPMOs from M. thermophila (MtLPMO9s) but not by three AA9 LPMOs from Neurospora crassa (NcLPMO9s). The interplay with MtLPMO9s is explained by the H2O2-producing capability of the AA16s, which, in the presence of cellulose, allows the MtLPMO9s to optimally drive their peroxygenase activity. Replacement of MtAA16A by glucose oxidase (AnGOX) with the same H2O2-producing activity could only achieve less than 50% of the boosting effect achieved by MtAA16A, and earlier MtLPMO9B inactivation (6 h) was observed. To explain these results, we hypothesized that the delivery of AA16-produced H2O2 to the MtLPMO9s is facilitated by protein–protein interaction. Our findings provide new insights into the functions of copper-dependent enzymes and contribute to a further understanding of the interplay of oxidative enzymes within fungal systems to degrade lignocellulose.

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Novel, acidic, and cold-adapted glycoside hydrolase family 8 endo-β-1, 4-glucanase from an Antarctic lichen-associated bacterium, Lichenicola cladoniae PAMC 26568.

Kim, J., Lee, Y. M., Byeon, S. M., Gwak, J. H., Lee, J. S., Shin, D. H. & Park, H. Y. (2022). Frontiers in Microbiology, 13.

Endo-β-1,4-glucanase is a crucial glycoside hydrolase (GH) involved in the decomposition of cellulosic materials. In this study, to discover a novel cold-adapted β-1,4-d-glucan-degrading enzyme, the gene coding for an extracellular endo-β-1,4-glucanase (GluL) from Lichenicola cladoniae PAMC 26568, an Antarctic lichen (Cladonia borealis)-associated bacterium, was identified and recombinantly expressed in Escherichia coli BL21. The GluL gene (1044-bp) encoded a non-modular polypeptide consisting of a single catalytic GH8 domain, which shared the highest sequence identity of 55% with that of an uncharacterized protein from Gluconacetobacter takamatsuzukensis (WP_182950054). The recombinant endo-β-1,4-glucanase (rGluL: 38.0 kDa) most efficiently degraded sodium carboxymethylcellulose (CMC) at pH 4.0 and 45°C, and showed approximately 23% of its maximum degradation activity even at 3°C. The biocatalytic activity of rGluL was noticeably enhanced by >1.3-fold in the presence of 1 mM Mn2+ or NaCl at concentrations between 0.1 and 0.5 M, whereas the enzyme was considerably downregulated by 1 mM Hg2+ and Fe2+ together with 5 mM N-bromosuccinimide and 0.5% sodium dodecyl sulfate. rGluL is a true endo-β-1,4-glucanase, which could preferentially decompose d-cellooligosaccharides consisting of 3 to 6 d-glucose, CMC, and barley β-glucan, without other additional glycoside hydrolase activities. The specific activity (15.1 U mg–1) and kcat/Km value (6.35 mg–1 s–1mL) of rGluL toward barley β-glucan were approximately 1.8- and 2.2-fold higher, respectively, compared to its specific activity (8.3 U mg–1) and kcat/Km value (2.83 mg–1 s–1mL) toward CMC. The enzymatic hydrolysis of CMC, d-cellotetraose, and d-cellohexaose yielded primarily d-cellobiose, accompanied by d-glucose, d-cellotriose, and d-cellotetraose. However, the cleavage of d-cellopentaose by rGluL resulted in the production of only d-cellobiose and d-cellotriose. The findings of the present study imply that rGluL is a novel, acidic, and cold-adapted GH8 endo-β-1,4-glucanase with high specific activity, which can be exploited as a promising candidate in low-temperature processes including textile and food processes.

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Biological cellulose saccharification using a coculture of Clostridium thermocellum and Thermobrachium celere strain A9.

Nhim, S., Waeonukul, R., Uke, A., Baramee, S., Ratanakhanokchai, K., Tachaapaikoon, C., Pason, P., Liu, Ya-Jun, & Kosugi, A. (2022). Applied microbiology and Biotechnology, 106(5), 2133-2145.

An anaerobic thermophilic bacterial strain, A9 (NITE P-03545), that secretes β-glucosidase was newly isolated from wastewater sediments by screening using esculin. The 16S rRNA gene sequence of strain A9 had 100% identity with that of Thermobrachium celere type strain JW/YL-NZ35. The complete genome sequence of strain A9 showed 98.4% average nucleotide identity with strain JW/YL-NZ35. However, strain A9 had different physiological properties from strain JW/YL-NZ35, which cannot secrete β-glucosidases or grow on cellobiose as the sole carbon source. The key β-glucosidase gene (TcBG1) of strain A9, which belongs to glycoside hydrolase family 1, was characterized. Recombinant β-glucosidase (rTcBG1) hydrolyzed cellooligosaccharides to glucose effectively. Furthermore, rTcBG1 showed high thermostability (at 60°C for 2 days) and high glucose tolerance (IC50 = 0.75 M glucose), suggesting that rTcBG1 could be used for biological cellulose saccharification in cocultures with Clostridium thermocellum. High cellulose degradation was observed when strain A9 was cocultured with C. thermocellum in a medium containing 50 g/l crystalline cellulose, and glucose accumulation in the culture supernatant reached 35.2 g/l. In contrast, neither a monoculture of C. thermocellum nor coculture of C. thermocellum with strain JW/YL-NZ35 realized efficient cellulose degradation or high glucose accumulation. These results show that the β-glucosidase secreted by strain A9 degrades cellulose effectively in combination with C. thermocellum cellulosomes and has the potential to be used in a new biological cellulose saccharification process that does not require supplementation with β-glucosidases.

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Inhibition of LPMOs by Fermented Persimmon Juice.

Tokin, R., Ipsen, J. Ø., Poojary, M. M., Jensen, P. E., Olsson, L. & Johansen, K. S. (2021). Biomolecules, 11(12), 1890.

Fermented persimmon juice, Kakishibu, has traditionally been used for wood and paper protection. This protective effect stems at least partially from inhibition of microbial cellulose degrading enzymes. The inhibitory effect of Kakishibu on lytic polysaccharide monooxygenases (LPMOs) and on a cocktail of cellulose hydrolases was studied, using three different cellulosic substrates. Dose dependent inhibition of LPMO activity by a commercial Kakishibu product was assessed for the well-characterized LPMO from Thermoascus aurantiacus TaAA9A, and the inhibitory effect was confirmed on five additional microbial LPMOs. The model tannin compound, tannic acid exhibited a similar inhibitory effect on TaAA9A as Kakishibu. It was further shown that both polyethylene glycol and tannase can alleviate the inhibitory effect of Kakishibu and tannic acid, indicating a likely mechanism of inhibition caused by unspecific tannin-protein interactions.

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Chromatographic analysis of oxidized cello-oligomers generated by lytic polysaccharide monooxygenases using dual electrolytic eluent generation.

Østby, H., Jameson, J. K., Costa, T., Eijsink, V. G. & Arntzen, M. Ø. (2021). Journal of Chromatography A, 462691.

Research on oligosaccharides, including the complicated product mixtures generated by lytic polysaccharide monooxygenases (LPMOs), is growing at a rapid pace. LPMOs are gaining major interest, and the ability to efficiently and accurately separate and quantify their native and oxidized products chromatographically is essential in furthering our understanding of these oxidative enzymes. Here we present a novel set of methods based on dual electrolytic eluent generation, where the conventional sodium acetate/sodium hydroxide (NaOAc/NaOH) eluents in high-performance anion-exchange chromatography (HPAEC) are replaced by electrolytically-generated potassium methane sulfonate/potassium hydroxide (KMSA/KOH). The new methods separate all compounds of interest within 24-45 minutes and with high sensitivity; limits of detection and quantification were in the range of 0.0001-0.0032 mM and 0.0002-0.0096 mM, respectively. In addition, an average of 3.5 times improvement in analytical CV was obtained. This chromatographic platform overcomes drawbacks associated with manual preparation of eluents and offers simplified operation and rapid method optimization, with increased precision for less abundant LPMO-derived products.

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Oligosaccharides production by enzymatic hydrolysis of banana pseudostem pulp.

Díaz, S., Ortega, Z., Benítez, A. N., Marrero, M. D., Carvalheiro, F., Duarte, L. C., Leonidas Matsakas, L., Eleni Krikigianni, E., Ulrika Rova, U., Christakopoulos, P. & Fernandes, M. C. (2021). Biomass Conversion and Biorefinery, 136, 1-12.

Banana production generates significant amounts of agricultural wastes, being fiber extraction one of the most relevant alternatives for their valorization. This process produces banana’s pseudostem pulp (BPP) as a byproduct, which shows an interesting composition for the biorefinery’s biochemical platform, with high polysaccharides (68%) and low lignin contents. This work deals with the enzymatic hydrolysis (EH) of raw and hydrothermally pre-treated BPP, focusing on the production of oligosaccharides (OS). Raw BPP hydrolysis with cellulase at different dosages rendered only 3.2% OS yields (OSY). Pectinase addition has not affected EH performance. On the other hand, EH of hydrothermally pre-treated BPP at 150°C and 170°C (P150 and P170) allowed to increase OSY up to 28% (P150, 1 FPU of cellulase/g dry biomass, 12 h), being 72% of the solubilized sugars in the form of cello-oligosaccharides. This last condition was subjected to a multi-stage EH strategy without improvements in OSY. An endo-glucanase was also tested, but obtained OSY were lower than cellulase results. Finally, obtained OS demonstrated to stimulate the growth of two Lactobacilli strains. The results show that BPP pre-treated under mild operational conditions is a good candidate for cello-oligosaccharides production by EH using 1 FPU/g DB of cellulase with a simple strategy.

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Four cellulose-active lytic polysaccharide monooxygenases from Cellulomonas species.

Li, J., Solhi, L., Goddard-Borger, E. D., Mathieu, Y., Wakarchuk, W. W., Withers, S. G. & Brumer, H. (2021). Biotechnology for Biofuels, 14(1), 1-19.

Background: The discovery of lytic polysaccharide monooxygenases (LPMOs) has fundamentally changed our understanding of microbial lignocellulose degradation. Cellulomonas bacteria have a rich history of study due to their ability to degrade recalcitrant cellulose, yet little is known about the predicted LPMOs that they encode from Auxiliary Activity Family 10 (AA10). Results: Here, we present the comprehensive biochemical characterization of three AA10 LPMOs from Cellulomonas flavigena (CflaLPMO10A, CflaLPMO10B, and CflaLPMO10C) and one LPMO from Cellulomonas fimi (CfiLPMO10). We demonstrate that these four enzymes oxidize insoluble cellulose with C1 regioselectivity and show a preference for substrates with high surface area. In addition, CflaLPMO10B, CflaLPMO10C, and CfiLPMO10 exhibit limited capacity to perform mixed C1/C4 regioselective oxidative cleavage. Thermostability analysis indicates that these LPMOs can refold spontaneously following denaturation dependent on the presence of copper coordination. Scanning and transmission electron microscopy revealed substrate-specific surface and structural morphological changes following LPMO action on Avicel and phosphoric acid-swollen cellulose (PASC). Further, we demonstrate that the LPMOs encoded by Cellulomonas flavigena exhibit synergy in cellulose degradation, which is due in part to decreased autoinactivation. Conclusions: Together, these results advance understanding of the cellulose utilization machinery of historically important Cellulomonas species beyond hydrolytic enzymes to include lytic cleavage. This work also contributes to the broader mapping of enzyme activity in Auxiliary Activity Family 10 and provides new biocatalysts for potential applications in biomass modification.

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