7xz8

Mutant (K141A) of the N-terminal domain of fucoidan lyase FdlA

spinqualitylabelsall models 7xz8, resolution 1.89Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7xz8 is a 1 chain structure with sequence from Flavobacteriaceae bacterium SA-0082. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.89Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Fucoidans represent a type of polyanionic fucose-containing sulfated polysaccharides (FCSPs) that are cleaved by fucoidan-degrading enzymes, producing low-molecular-weight fucoidans with multiple biological activities suitable for pharmacological use. Most of the reported fucoidan-degrading enzymes are glycoside hydrolases, which have been well studied for their structures and catalytic mechanisms. Little is known, however, about the rarer fucoidan lyases, primarily due to the lack of structural information. FdlA from Flavobacterium sp. SA-0082 is an endo-type fucoidan-degrading enzyme that cleaves the sulfated fuco-glucuronomannan (SFGM) through a lytic mechanism. Here, we report nine crystal structures of the catalytic N-terminal domain of FdlA (FdlA-NTD), in both its wild type (WT) and mutant forms, at resolutions ranging from 1.30 to 2.25 A. We show that the FdlA-NTD adopts a right-handed parallel beta-helix fold, and possesses a substrate binding site composed of a long groove and a unique alkaline pocket. Our structural, biochemical, and enzymological analyses strongly suggest that FdlA-NTD utilizes catalytic residues different from other beta-helix polysaccharide lyases, potentially representing a novel polysaccharide lyase family. Structural and Biochemical Analysis Reveals Catalytic Mechanism of Fucoidan Lyase from Flavobacterium sp. SA-0082.,Wang J, Liu Z, Pan X, Wang N, Li L, Du Y, Li J, Li M Mar Drugs. 2022 Aug 20;20(8). pii: md20080533. doi: 10.3390/md20080533. PMID:36005536 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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