3nyd

Crystal Structure of Kemp Eliminase HG-2 Complexed with Transition State Analog 5-Nitro Benzotriazole

spinqualitylabelsall models 3nyd, resolution 1.23Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3nyd is a 2 chain structure with sequence from Thermoascus aurantiacus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.23Å Ligands: 3NY, ACT, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function XYNA_THEAU Publication Abstract from PubMed A general approach for the computational design of enzymes to catalyze arbitrary reactions is a goal at the forefront of the field of protein design. Recently, computationally designed enzymes have been produced for three chemical reactions through the synthesis and screening of a large number of variants. Here, we present an iterative approach that has led to the development of the most catalytically efficient computationally designed enzyme for the Kemp elimination to date. Previously established computational techniques were used to generate an initial design, HG-1, which was catalytically inactive. Analysis of HG-1 with molecular dynamics simulations (MD) and X-ray crystallography indicated that the inactivity might be due to bound waters and high flexibility of residues within the active site. This analysis guided changes to our design procedure, moved the design deeper into the interior of the protein, and resulted in an active Kemp eliminase, HG-2. The cocrystal structure of this enzyme with a transition state analog (TSA) revealed that the TSA was bound in the active site, interacted with the intended catalytic base in a catalytically relevant manner, but was flipped relative to the design model. MD analysis of HG-2 led to an additional point mutation, HG-3, that produced a further threefold improvement in activity. This iterative approach to computational enzyme design, including detailed MD and structural analysis of both active and inactive designs, promises a more complete understanding of the underlying principles of enzymatic catalysis and furthers progress toward reliably producing active enzymes. Iterative approach to computational enzyme design.,Privett HK, Kiss G, Lee TM, Blomberg R, Chica RA, Thomas LM, Hilvert D, Houk KN, Mayo SL Proc Natl Acad Sci U S A. 2012 Mar 6;109(10):3790-5. Epub 2012 Feb 22. PMID:22357762 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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