6isq

structure of Lipase mutant with oxided Cys-His-Asp catalytic triad

spinqualitylabelsall models 6isq, resolution 1.86Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6isq is a 2 chain structure with sequence from Moesziomyces antarcticus. 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: ACT, CSD, EDO, IPA, PGE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function LIPB_PSEA2 Hydrolysis of triglycerides. Is very stereospecific both in hydrolysis and in organic synthesis and has a potentially important application in glucolipid synthesis. Publication Abstract from PubMed Engineering artificial enzymes with high activity and catalytic mechanism different from naturally occurring enzymes is a challenge in protein design. For example, many attempts have been made to obtain active hydrolases by introducing a Ser --> Cys exchange at the respective catalytic triads, but this generally induced a breakdown of activity. We now report that this long-standing dogma no longer pertains, provided additional mutations are introduced by directed evolution. By employing Candida antarctica lipase B (CALB) as the model enzyme with the Ser-His-Asp catalytic triad, a highly active cysteine-lipase having a Cys-His-Asp catalytic triad and additional mutations W104V/A281Y/A282Y/V149G can be evolved, showing a 40-fold higher catalytic efficiency than wild-type CALB in the hydrolysis of 4-nitrophenyl benzoate, and tolerating bulky substrates. Crystal structures, kinetics, MD simulations and QM/MM calculations reveal dynamic features and explain all results, including the preference of a two-step mechanism involving the zwitterionic pair Cys105(-)/His224(+) rather than a concerted process. Artificial cysteine-lipases with high activity and altered catalytic mechanism created by laboratory evolution.,Cen Y, Singh W, Arkin M, Moody TS, Huang M, Zhou J, Wu Q, Reetz MT Nat Commun. 2019 Jul 19;10(1):3198. doi: 10.1038/s41467-019-11155-3. PMID:31324776 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lipase 3D Structures

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