Abstract
By the use of pulsed nuclear magnetic resonance techniques, the dissociation constant of Mn 2+ -citrate lyase (citrate oxaloacetate-lyase, EC 4.1.3.6) has been determined to be 0.4 · 10 −4 M. This value is in agreement with the kinetically determined value. No evidence for ternary complex formation was found. The reaction would seem to be one that involves a metal-enzyme acting upon citrate (or acetate and oxaloacetate) rather than an enzyme acting upon a metal-citrate complex.
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