7k4x | pdb_00007k4x

Crystal structure of Kemp Eliminase HG3.7 in complex with the transition state analog 6-nitrobenzotriazole

spinqualitylabelsall models 7k4x, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7k4x is a 2 chain structure with sequence from Theau. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 6NT, ACT, SO4 Gene: XYNA (THEAU) Activity: Endo-1,4-beta-xylanase, with EC number 3.2.1.8 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The advent of biocatalysts designed computationally and optimized by laboratory evolution provides an opportunity to explore molecular strategies for augmenting catalytic function. Applying a suite of nuclear magnetic resonance, crystallography, and stopped-flow techniques to an enzyme designed for an elementary proton transfer reaction, we show how directed evolution gradually altered the conformational ensemble of the protein scaffold to populate a narrow, highly active conformational ensemble and accelerate this transformation by nearly nine orders of magnitude. Mutations acquired during optimization enabled global conformational changes, including high-energy backbone rearrangements, that cooperatively organized the catalytic base and oxyanion stabilizer, thus perfecting transition-state stabilization. The development of protein catalysts for many chemical transformations could be facilitated by explicitly sampling conformational substates during design and specifically stabilizing productive substates over all unproductive conformations. How directed evolution reshapes the energy landscape in an enzyme to boost catalysis.,Otten R, Padua RAP, Bunzel HA, Nguyen V, Pitsawong W, Patterson M, Sui S, Perry SL, Cohen AE, Hilvert D, Kern D Science. 2020 Dec 18;370(6523):1442-1446. doi: 10.1126/science.abd3623. Epub 2020, Nov 19. PMID:33214289 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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