7b6b | pdb_00007b6b

The carbohydrate binding module family 48 (CBM48) and carboxy-terminal carbohydrate esterase family 1 (CE1) domains of the multidomain esterase DmCE1B from Dysgonomonas mossii in complex with methyl ferulate

spinqualitylabelsall models 7b6b, resolution 1.41Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7b6b is a 2 chain structure with sequence from Dysgonomonas mossii DSM 22836. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.41Å Ligands: CL, EDO, SZQ Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function F8X1N1_9BACT Publication Abstract from PubMed The gut microbiota plays a central role in human health by enzymatically degrading dietary fiber and concomitantly excreting short chain fatty acids that are associated with manifold health benefits. The polysaccharide xylan is abundant in dietary fiber but non-carbohydrate decorations hinder efficient cleavage by glycoside hydrolases (GHs) and need to be addressed by carbohydrate esterases (CEs). Enzymes from carbohydrate esterase families 1 and 6 (CE1 & 6) perform key roles in xylan degradation by removing feruloyl and acetate decorations, yet little is known about these enzyme families especially with regards to their diversity in activity. Bacteroidetes bacteria are dominant members of the microbiota and often encode their carbohydrate-active enzymes in multi-gene polysaccharide utilization loci (PULs). Here we present the characterization of three CEs found in a PUL encoded by the gut Bacteroidete Dysgonomonas mossii. We demonstrate that the CEs are functionally distinct, with one highly efficient CE6 acetyl esterase and two CE1 enzymes with feruloyl esterase activities. One multidomain CE1 enzyme contains two CE1 domains: an N-terminal domain feruloyl esterase, and a C-terminal domain with minimal activity on model substrates. We present the structure of the C-terminal CE1 domain with the carbohydrate binding module that bridges the two CE1 domains, as well as a complex of the same protein fragment with methyl ferulate. The investment of D. mossii in producing multiple CEs suggests that improved accessibility of xylan for GHs as well as cleavage of covalent polysaccharide-polysaccharide and lignin-polysaccharide bonds are important enzyme activities in the gut environment. A polysaccharide utilization locus from the gut bacterium Dysgonomonas mossii encodes functionally distinct carbohydrate esterases.,Kmezik C, Mazurkewich S, Meents T, McKee LS, Idstrom A, Armeni M, Savolainen O, Branden G, Larsbrink J J Biol Chem. 2021 Mar 2:100500. doi: 10.1016/j.jbc.2021.100500. PMID:33667545 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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