2e7z
Acetylene Hydratase from Pelobacter acetylenicusAcetylene Hydratase from Pelobacter acetylenicus
Structural highlights
FunctionAHY_SYNAC Catalyzes the hydration of acetylene to form acetaldehyde. Ethylene cannot act as a substrate.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe tungsten-iron-sulfur enzyme acetylene hydratase stands out from its class because it catalyzes a nonredox reaction, the hydration of acetylene to acetaldehyde. Sequence comparisons group the protein into the dimethyl sulfoxide reductase family, and it contains a bis-molybdopterin guanine dinucleotide-ligated tungsten atom and a cubane-type [4Fe:4S] cluster. The crystal structure of acetylene hydratase at 1.26 A now shows that the tungsten center binds a water molecule that is activated by an adjacent aspartate residue, enabling it to attack acetylene bound in a distinct, hydrophobic pocket. This mechanism requires a strong shift of pK(a) of the aspartate, caused by a nearby low-potential [4Fe:4S] cluster. To access this previously unrecognized W-Asp active site, the protein evolved a new substrate channel distant from where it is found in other molybdenum and tungsten enzymes. Structure of the non-redox-active tungsten/[4Fe:4S] enzyme acetylene hydratase.,Seiffert GB, Ullmann GM, Messerschmidt A, Schink B, Kroneck PM, Einsle O Proc Natl Acad Sci U S A. 2007 Feb 27;104(9):3073-7. PMID:17360611[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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