4cxk | pdb_00004cxk

G9 mutant of PAS, arylsulfatase from Pseudomonas Aeruginosa

spinqualitylabelsall models 4cxk, resolution 1.86Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4cxk is a 2 chain structure with sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.86Å Ligands: CA, DDZ, PEG, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ARS_PSEAE Publication Abstract from PubMed The recruitment and evolutionary optimization of promiscuous enzymes is key to the rapid adaptation of organisms to changing environments. Our understanding of the precise mechanisms underlying enzyme repurposing is, however, limited: What are the active-site features that enable the molecular recognition of multiple substrates with contrasting catalytic requirements? To gain insights into the molecular determinants of adaptation in promiscuous enzymes, we performed the laboratory evolution of an arylsulfatase to improve its initially weak phenylphosphonate hydrolase activity. The evolutionary trajectory led to a 100,000-fold enhancement of phenylphosphonate hydrolysis, while the native sulfate and promiscuous phosphate mono- and diester hydrolyses were only marginally affected (</=50-fold). Structural, kinetic, and in silico characterizations of the evolutionary intermediates revealed that two key mutations, T50A and M72V, locally reshaped the active site, improving access to the catalytic machinery for the phosphonate. Measured transition state (TS) charge changes along the trajectory suggest the creation of a new Michaelis complex (E*S, enzyme-substrate), with enhanced leaving group stabilization in the TS for the promiscuous phosphonate (betaleavinggroup from -1.08 to -0.42). Rather than altering the catalytic machinery, evolutionary repurposing was achieved by fine-tuning the molecular recognition of the phosphonate in the Michaelis complex, and by extension, also in the TS. This molecular scenario constitutes a mechanistic alternative to adaptation solely based on enzyme flexibility and conformational selection. Instead, rapid functional transitions between distinct chemical reactions rely on the high reactivity of permissive active-site architectures that allow multiple substrate binding modes. Evolutionary repurposing of a sulfatase: A new Michaelis complex leads to efficient transition state charge offset.,Miton CM, Jonas S, Fischer G, Duarte F, Mohamed MF, van Loo B, Kintses B, Kamerlin SCL, Tokuriki N, Hyvonen M, Hollfelder F Proc Natl Acad Sci U S A. 2018 Jul 31;115(31):E7293-E7302. doi:, 10.1073/pnas.1607817115. Epub 2018 Jul 16. PMID:30012610 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Sulfatase 3D structures

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