scholarly journals Correction to “Oxidative Cleavage of Cellobiose by Lytic Polysaccharide Monooxygenase (LPMO)-Inspired Copper Complexes”

ACS Omega ◽  
2020 ◽  
Vol 5 (43) ◽  
pp. 28403-28403
Author(s):  
Andrea. C. Neira ◽  
Paulina R. Martínez-Alanis ◽  
Gabriel Aullón ◽  
Marcos Flores-Alamo ◽  
Paulino Zerón ◽  
...  
Keyword(s):  
Copper Complexes ◽  
Oxidative Cleavage ◽  
Lytic Polysaccharide Monooxygenase ◽  
Polysaccharide Monooxygenase

scholarly journals Oxidative Cleavage of Cellobiose by Lytic Polysaccharide Monooxygenase (LPMO)-Inspired Copper Complexes

ACS Omega ◽  
2019 ◽  
Vol 4 (6) ◽  
pp. 10729-10740 ◽  
Author(s):  
Andrea. C. Neira ◽  
Paulina R. Martínez-Alanis ◽  
Gabriel Aullón ◽  
Marcos Flores-Alamo ◽  
Paulino Zerón ◽  
...  
Keyword(s):  
Copper Complexes ◽  
Oxidative Cleavage ◽  
Lytic Polysaccharide Monooxygenase ◽  
Polysaccharide Monooxygenase

scholarly journals NEW ASPECTS OF THE ENZYMATIC BREAKDOWN OF CHITIN: A REVIEW

2021 ◽  
Vol 26 ◽  
pp. 5-10
Author(s):  
Urszula Jankiewicz ◽  
◽  
Arletta Kochańska-Jeziorska ◽  
Agnieszka Gałązka
Keyword(s):  
Crystalline Structure ◽  
Enzymatic Degradation ◽  
Soluble Sugars ◽  
Practical Importance ◽  
Oxidative Cleavage ◽  
Lytic Polysaccharide Monooxygenase ◽  
Great Practical Importance ◽  
Polysaccharide Monooxygenase

This review focuses on the enzymatic breakdown of chitin, taking into account the latest scientific reports on the activity of lytic polysaccharide monooxygenase (LPMO). Chitin is a natural, abundant polysaccharide of great practical importance in the environment. However, the insolubility in water and the tightly packed crystalline structure of chitin pose a serious obstacle to enzymatic degradation. This substrate can be converted into soluble sugars by the action of glycosidic hydrolases (GH), also known as chitinases. LPMO could prove to be helpful in enzymatic processes that increase the rate of chitin depolymerisation by improving the availability of substrates for chitinases. The unique action of LPMO is based on the ability to catalyse the oxidative cleavage of glycosidic chains present in complex, resistant crystal networks of chitin, and this cleavage facilitates the subsequent action of glycolytic hydrolases.

Oxidative cleavage of some cellulosic substrates by auxiliary activity (AA) family 9 enzymes influences the adsorption/desorption of hydrolytic cellulase enzymes

2016 ◽  
Vol 18 (23) ◽  
pp. 6329-6336 ◽  
Author(s):  
Jinguang Hu ◽  
Amadeus Pribowo ◽  
Jack N. Saddler
Keyword(s):  
Oxidative Cleavage ◽  
Lytic Polysaccharide Monooxygenase ◽  
Cellulase Enzymes ◽  
Adsorption Desorption ◽  
Hydrolysis Of ◽  
Polysaccharide Monooxygenase

The addition of Lytic polysaccharide monooxygenase (LPMO's) increases the desorption of exoglucanases during the hydrolysis of cellulosic substrates.

scholarly journals A Lytic Polysaccharide Monooxygenase with Broad Xyloglucan Specificity from the Brown-Rot Fungus Gloeophyllum trabeum and Its Action on Cellulose-Xyloglucan Complexes

2016 ◽  
Vol 82 (22) ◽  
pp. 6557-6572 ◽  
Author(s):  
Yuka Kojima ◽  
Anikó Várnai ◽  
Takuya Ishida ◽  
Naoki Sunagawa ◽  
Dejan M. Petrovic ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Dynamic Viscosity ◽  
Brown Rot ◽  
Primary Cell Wall ◽  
Gloeophyllum Trabeum ◽  
Lytic Polysaccharide Monooxygenase ◽  
Content Type ◽  
Brown Rot Fungus ◽  
Sensitive Method ◽  
Polysaccharide Monooxygenase

ABSTRACTFungi secrete a set of glycoside hydrolases and lytic polysaccharide monooxygenases (LPMOs) to degrade plant polysaccharides. Brown-rot fungi, such asGloeophyllum trabeum, tend to have few LPMOs, and information on these enzymes is scarce. The genome ofG. trabeumencodes four auxiliary activity 9 (AA9) LPMOs (GtLPMO9s), whose coding sequences were amplified from cDNA. Due to alternative splicing, two variants ofGtLPMO9A seem to be produced, a single-domain variant,GtLPMO9A-1, and a longer variant,GtLPMO9A-2, which contains a C-terminal domain comprising approximately 55 residues without a predicted function. We have overexpressed the phylogenetically distinctGtLPMO9A-2 inPichia pastorisand investigated its properties. Standard analyses using high-performance anion-exchange chromatography–pulsed amperometric detection (HPAEC-PAD) and mass spectrometry (MS) showed thatGtLPMO9A-2 is active on cellulose, carboxymethyl cellulose, and xyloglucan. Importantly, compared to other known xyloglucan-active LPMOs,GtLPMO9A-2 has broad specificity, cleaving at any position along the β-glucan backbone of xyloglucan, regardless of substitutions. Using dynamic viscosity measurements to compare the hemicellulolytic action ofGtLPMO9A-2 to that of a well-characterized hemicellulolytic LPMO,NcLPMO9C fromNeurospora crassarevealed thatGtLPMO9A-2 is more efficient in depolymerizing xyloglucan. These measurements also revealed minor activity on glucomannan that could not be detected by the analysis of soluble products by HPAEC-PAD and MS and that was lower than the activity ofNcLPMO9C. Experiments with copolymeric substrates showed an inhibitory effect of hemicellulose coating on cellulolytic LPMO activity and did not reveal additional activities ofGtLPMO9A-2. These results provide insight into the LPMO potential ofG. trabeumand provide a novel sensitive method, a measurement of dynamic viscosity, for monitoring LPMO activity.IMPORTANCECurrently, there are only a few methods available to analyze end products of lytic polysaccharide monooxygenase (LPMO) activity, the most common ones being liquid chromatography and mass spectrometry. Here, we present an alternative and sensitive method based on measurement of dynamic viscosity for real-time continuous monitoring of LPMO activity in the presence of water-soluble hemicelluloses, such as xyloglucan. We have used both these novel and existing analytical methods to characterize a xyloglucan-active LPMO from a brown-rot fungus. This enzyme,GtLPMO9A-2, differs from previously characterized LPMOs in having broad substrate specificity, enabling almost random cleavage of the xyloglucan backbone.GtLPMO9A-2 acts preferentially on free xyloglucan, suggesting a preference for xyloglucan chains that tether cellulose fibers together. The xyloglucan-degrading potential ofGtLPMO9A-2 suggests a role in decreasing wood strength at the initial stage of brown rot through degradation of the primary cell wall.

scholarly journals Recent Advances in Screening Methods for the Functional Investigation of Lytic Polysaccharide Monooxygenases

2021 ◽  
Vol 9 ◽  
Author(s):  
Damao Wang ◽  
Yanping Li ◽  
Yuting Zheng ◽  
Yves S. Y. Hsieh
Keyword(s):  
Copper Ions ◽  
Biomass Conversion ◽  
Screening Methods ◽  
Lytic Polysaccharide Monooxygenase ◽  
Indirect Measurements ◽  
Glycosidic Bonds ◽  
Lytic Polysaccharide Monooxygenases ◽  
Polysaccharide Monooxygenases ◽  
Functional Investigation ◽  
Polysaccharide Monooxygenase

Lytic polysaccharide monooxygenase (LPMO) is a newly discovered and widely studied enzyme in recent years. These enzymes play a key role in the depolymerization of sugar-based biopolymers (including cellulose, hemicellulose, chitin and starch), and have a positive significance for biomass conversion. LPMO is a copper-dependent enzyme that can oxidize and cleave glycosidic bonds in cellulose and other polysaccharides. Their mechanism of action depends on the correct coordination of copper ions in the active site. There are still difficulties in the analysis of LPMO activity, which often requires multiple methods to be used in concert. In this review, we discussed various LPMO activity analysis methods reported so far, including mature mass spectrometry, chromatography, labeling, and indirect measurements, and summarized the advantages, disadvantages and applicability of different methods.

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