6a99

Crystal structure of a Stig cyclases Fisc from Fischerella sp. TAU in complex with (3Z)-3-(1-methyl-2-pyrrolidinylidene)-3H-indole

spinqualitylabelsall models 6a99, resolution 2.29Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6a99 is a 4 chain structure with sequence from Mastigocladus laminosus UTEX LB 1931. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.29Å Ligands: 9UL, CA, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A1P8VSL7_9CYAN Publication Abstract from PubMed Found recently in stignomatales, the Stig cyclases catalyze the Cope rearrangement and intramolecular cyclization to produce complex indole alkaloids. Five crystal structures were solved of subfamily 1 and 2 Stig cyclases, which adopt a beta-sandwich fold like the non-catalytic carbohydrate-binding motif. Several complex structures were also determined of indole-based compounds, which are bound to the hydrophobic terminal cavity, where a conserved Asp residue makes an H-bond to the indole N and triggers the acid-catalyzed Cope rearrangement. Through analyzing the enzyme-ligand interactions and mutagenesis experiments, several aromatic residues were found important in catalysis. Apart from a common substrate binding mode and catalytic mechanism, potential subfamily variations that may attribute to the different product specificity are implicated. These results shall expand our scope of enzymology, in particular for further investigation of the biosynthetic Cope rearrangement. The Crystal Structure of a Class of Cyclases that Catalyze the Cope Rearrangement.,Chen CC, Hu X, Tang X, Yang Y, Ko TP, Gao J, Zheng Y, Huang JW, Yu Z, Li L, Han S, Cai N, Zhang Y, Liu W, Guo RT Angew Chem Int Ed Engl. 2018 Nov 12;57(46):15060-15064. doi:, 10.1002/anie.201808231. Epub 2018 Oct 23. PMID:30222239 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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