1ZG6:
reference: Structure of the wild-type TEM-1 beta-lactamase at 1.55 A and the mutant enzyme Ser70Ala at 2.1 A suggest the mode of noncovalent catalysis for the mutant enzyme., Stec B, Holtz KM, Wojciechowski CL, Kantrowitz ER, Acta Crystallogr D Biol Crystallogr 2005 Aug;61(Pt 8):1072-9. Epub 2005, Jul 20. PMID: 16041072

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