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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The active site of penicillinase from Staphylococcus aureus PC1. Isolation of a specific covalent complex with the substrate quinacillin.

1. The penicillinase-catalysed hydrolysis of quinacillin was quenched by addition of 5 m-guanidinium chloride or 1% (w/v) sodium dodecyl sulphate, and the quenched reaction mixture was dialysed exhaustively against solutions of the denaturant. 2. Irreversibly bound quinacillin was shown by titration with HgCl2 to be covalently attached to the protein by the beta-lactam carboxyl group. 3. The derivative was found to be stable over the pH range 3.5-8. 5. 4. Chymotryptic hydrolysis of the product and subsequent fractionation showed that quinacillin was bound to one or possibly two peptides.[1]

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