4u9d | pdb_00004u9d

Crystal Structure of the Zn-directed tetramer of the engineered cyt cb562 variant, AB3

spinqualitylabelsall models 4u9d, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4u9d is a 4 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HEC, ZN Gene: cybC ("Bacillus coli" Migula 1895) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [C562_ECOLX] Electron-transport protein of unknown function. Publication Abstract from PubMed The generation of new enzymatic activities has mainly relied on repurposing the interiors of preexisting protein folds because of the challenge in designing functional, three-dimensional protein structures from first principles. Here we report an artificial metallo-beta-lactamase, constructed via the self-assembly of a structurally and functionally unrelated, monomeric redox protein into a tetrameric assembly that possesses catalytic zinc sites in its interfaces. The designed metallo-beta-lactamase is functional in the Escherichia coli periplasm and enables the bacteria to survive treatment with ampicillin. In vivo screening of libraries has yielded a variant that displays a catalytic proficiency [(k(cat)/K(m))/k(uncat)] for ampicillin hydrolysis of 2.3 x 10(6) and features the emergence of a highly mobile loop near the active site, a key component of natural beta-lactamases to enable substrate interactions. A designed supramolecular protein assembly with in vivo enzymatic activity.,Song WJ, Tezcan FA Science. 2014 Dec 19;346(6216):1525-8. doi: 10.1126/science.1259680. PMID:25525249 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome b5 3D structures

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