6q7n

Crystal structure of BH32 alkylated with the mechanistic inhibitor 2-bromoacetophenoneCrystal structure of BH32 alkylated with the mechanistic inhibitor 2-bromoacetophenone

Structural highlights 6q7n is a 1 chain structure with sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.02Å Ligands: Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function O58216_PYRHO Publication Abstract from PubMed The combination of computational design and laboratory evolution is a powerful and potentially versatile strategy for the development of enzymes with new functions(1-4). However, the limited functionality presented by the genetic code restricts the range of catalytic mechanisms that are accessible in designed active sites. Inspired by mechanistic strategies from small-molecule organocatalysis(5), here we report the generation of a hydrolytic enzyme that uses Ndelta-methylhistidine as a non-canonical catalytic nucleophile. Histidine methylation is essential for catalytic function because it prevents the formation of unreactive acyl-enzyme intermediates, which has been a long-standing challenge when using canonical nucleophiles in enzyme design(6-10). Enzyme performance was optimized using directed evolution protocols adapted to an expanded genetic code, affording a biocatalyst capable of accelerating ester hydrolysis with greater than 9,000-fold increased efficiency over free Ndelta-methylhistidine in solution. Crystallographic snapshots along the evolutionary trajectory highlight the catalytic devices that are responsible for this increase in efficiency. Ndelta-methylhistidine can be considered to be a genetically encodable surrogate of the widely employed nucleophilic catalyst dimethylaminopyridine(11), and its use will create opportunities to design and engineer enzymes for a wealth of valuable chemical transformations. Design and evolution of an enzyme with a non-canonical organocatalytic mechanism.,Burke AJ, Lovelock SL, Frese A, Crawshaw R, Ortmayer M, Dunstan M, Levy C, Green AP Nature. 2019 May 27. pii: 10.1038/s41586-019-1262-8. doi:, 10.1038/s41586-019-1262-8. PMID:31132786 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

spinqualitylabelsall models 6q7n, resolution 2.02Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image