Carbohydrate Esterase Functionality in Plant Polysaccharide Degradation
Summary
Plant cell walls contain complex polysaccharides such as cellulose, hemicelluloses and pectins, often modified by acetyl and feruloyl groups that hinder enzymatic breakdown. Carbohydrate esterases (CEs) catalyse the removal of these ester-linked substituents, enhancing accessibility of glycoside hydrolases to the sugar backbone. Deacetylating enzymes such as acetyl xylan esterases cleave acetyl groups from xylan, while feruloyl esterases detach lignin–polysaccharide cross-links. Both CEs and hydrolases frequently operate in concert, creating synergistic pathways that drive efficient saccharification of lignocellulosic biomass. Advances in structural biology have elucidated the conserved catalytic triad and diverse active-site architectures across CE families, including the SGNH hydrolase superfamily. Insights into enzyme specificity, host secretion systems and adaptive motifs are guiding engineering of biocatalysts tailored for biofuel production, animal feed improvement and paper-pulp processing. Emerging technologies leverage metagenomic discovery and modular enzyme assemblies to harness CEs for sustainable biorefineries and to valorise agricultural residues at a global scale.
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Carbohydrate Esterase Functionality in Plant Polysaccharide Degradation publication trend
The graph below shows the total number of articles in carbohydrate esterase functionality in plant polysaccharide degradation across all publications each year (not limited to Nature Index journals).
Technical terms
Carbohydrate esterase: Enzyme that hydrolyses ester bonds between acetyl or aryl groups and sugar residues in polysaccharides.
Acetyl xylan esterase: CE that specifically removes acetyl substituents from the xylan backbone, facilitating xylanase action.
Feruloyl esterase: CE that cleaves ester linkages between ferulic acid and polysaccharide chains, releasing phenolic cross-links.
Polysaccharide utilization locus: Genomic region encoding co-regulated enzymes and transporters for complex carbohydrate degradation.
SGNH hydrolase superfamily: A class of proteins with a conserved four-β-strand fold and catalytic Ser-Gly-Asn-His motif, encompassing multiple CE families.
Catalytic triad: The trio of serine, histidine and aspartate residues that cooperatively mediate ester bond hydrolysis in serine esterases.
Xylan: A hemicellulose composed of β-1,4-linked xylose units often decorated with acetyl, arabinofuranosyl and glucuronosyl substituents.
References
- The SGNH hydrolase family: a template for carbohydrate diversity. Glycobiology (2022).
- Positional preferences of acetyl esterases from different CE families towards acetylated 4-O-methyl glucuronic acid-substituted xylo-oligosaccharides. Biotechnology for Biofuels and Bioproducts (2015).
- Polysaccharide utilization loci-driven enzyme discovery reveals BD-FAE: a bifunctional feruloyl and acetyl xylan esterase active on complex natural xylans. Biotechnology for Biofuels and Bioproducts (2021).
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