Abstract
We report the first example of a monoclonal antibody-catalysed hydrolysis of a β-lactam where the antibodies were generated by a simple transition-state analogue. A rat monoclonal antibody (1/91c/4d/26) generated by using an acyclic 4-nitrophenylphosphate immunogen catalysed the hydrolysis of corresponding 4-nitrophenyl carbonates but, more importantly, also catalysed the hydrolysis of N-(4-nitrophenyl)-azetidinone at pH 8 with k cat =8.7×10 −6 s −1 and K M =35 μM . This is the first example of a rat monoclonal catalytic antibody.
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