8ih1 | pdb_00008ih1

Room temperature structure of GH11 from Thermoanaerobacterium saccharolyticum by serial crystallography

spinqualitylabelsall models 8ih1, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8ih1 is a 2 chain structure with sequence from Thermoanaerobacterium saccharolyticum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.75Å Ligands: ACT Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function I3VTR8_THESW Publication Abstract from PubMed Xylanases are important for the enzymatic breakdown of lignocellulose-based biomass to produce biofuels and other value-added products. We report functional and structural analyses of TsaGH11, an endo-1,4-beta-xylanase from the hemicellulose-degrading bacterium, Thermoanaerobacterium saccharolyticum. TsaGH11 was shown to be a thermophilic enzyme that favors acidic conditions with maximum activity at pH 5.0 and 70 degrees C. It decomposes xylans from beechwood and oat spelts to xylose-containing oligosaccharides with specific activities of 5622.0 and 3959.3 U mg(-1), respectively. The kinetic parameters, K(m) and k(cat) towards beechwood xylan, are 12.9 mg mL(-1) and 34,015.3 s(-1), respectively, resulting in k(cat)/K(m) value of 2658.7 mL mg(-1) s(-1), higher by 10(2)-10(3) orders of magnitude compared to other reported GH11s investigated with the same substrate, demonstrating its superior catalytic performance. Crystal structures of TsaGH11 revealed a beta-jelly roll fold, exhibiting open and close conformations of the substrate-binding site by distinct conformational flexibility to the thumb region of TsaGH11. In the room-temperature structure of TsaGH11 determined by serial synchrotron crystallography, the electron density map of the thumb domain of the TsaGH11 molecule, which does not affect crystal packing, is disordered, indicating that the thumb domain of TsaGH11 has high structural flexibility at room temperature, with the water molecules in the substrate-binding cleft being more disordered than those in the cryogenic structure. These results expand our knowledge of GH11 structural flexibility at room temperature and pave the way for its application in industrial biomass degradation. Characterization and structural analysis of the endo-1,4-beta-xylanase GH11 from the hemicellulose-degrading Thermoanaerobacterium saccharolyticum useful for lignocellulose saccharification.,Kim IJ, Kim SR, Kim KH, Bornscheuer UT, Nam KH Sci Rep. 2023 Oct 13;13(1):17332. doi: 10.1038/s41598-023-44495-8. PMID:37833340 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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