dictionary help| double displacement mechanism --> ping-pong mechanism | medical dictionary |
A special multisubstrate reaction in which, for a two-substrate, two-product (i.e., bi-bi) system, an enzyme reacts with one substrate to form a product and a modified enzyme, the latter then reacting with a second substrate to form a second, final product, and regenerating the original enzyme. An example of such a mechanism is found in the aminotransferases. More complex ping-pong mechanisms exist for enzymes having more than two substrates.
Synonyms: double displacement mechanism.
(05 Mar 2000)
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