6g3h

Crystal structure of EDDS lyase in complex with SS-EDDS

spinqualitylabelsall models 6g3h, resolution 2.27Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6g3h is a 1 chain structure with sequence from Chesb. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: EKQ Gene: Meso_0564 (CHESB) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The natural aminocarboxylic acid product ethylenediamine- N, N'-disuccinic acid [( S, S)-EDDS] is able to form a stable complex with metal ions, making it an attractive biodegradable alternative for the synthetic metal chelator ethylenediaminetetraacetic acid (EDTA), which is currently used on a large scale in numerous applications. Previous studies have demonstrated that biodegradation of ( S, S)-EDDS may be initiated by an EDDS lyase, converting ( S, S)-EDDS via the intermediate N-(2-aminoethyl)aspartic acid (AEAA) into ethylenediamine and two molecules of fumarate. However, current knowledge of this enzyme is limited because of the absence of structural data. Here, we describe the identification and characterization of an EDDS lyase from Chelativorans sp. BNC1, which has a broad substrate scope, accepting various mono- and diamines for addition to fumarate. We report crystal structures of the enzyme in an unliganded state and in complex with formate, succinate, fumarate, AEAA, and ( S, S)-EDDS. The structures reveal a tertiary and quaternary fold that is characteristic of the aspartase/fumarase superfamily and support a mechanism that involves general base-catalyzed, sequential two-step deamination of ( S, S)-EDDS. This work broadens our understanding of mechanistic diversity within the aspartase/fumarase superfamily and will aid in the optimization of EDDS lyase for asymmetric synthesis of valuable (metal-chelating) aminocarboxylic acids. Structural Basis for the Catalytic Mechanism of Ethylenediamine- N, N'-disuccinic Acid Lyase, a Carbon-Nitrogen Bond-Forming Enzyme with a Broad Substrate Scope.,Poddar H, de Villiers J, Zhang J, Puthan Veetil V, Raj H, Thunnissen AWH, Poelarends GJ Biochemistry. 2018 May 18. doi: 10.1021/acs.biochem.8b00406. PMID:29741885 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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