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Comparative cadmium 113 nmr studies on rabbit cadmium 113 metallothionein zinc cadmium metallothionein 2a and partially metal depleted cadmium 113 metallothionein 2a


, : Comparative cadmium 113 nmr studies on rabbit cadmium 113 metallothionein zinc cadmium metallothionein 2a and partially metal depleted cadmium 113 metallothionein 2a. Biochemical Journal 253(2): 611-614

Rabbit 113Cd7-metallothionein-2a (MT) contains two metal-thiolate clusters of three (cluster B) and four (cluster A) metal ions. The 113Cd-n.m.r. spectrum of 113Cd6-MT, isolated from 113Cd7-MT upon treatment with EDTA, is similar to that of 113Cd7-MT, but the cluster B resonances are lower in in intensity, suggesting its co-operative metal depletion. (Zn1, 113Cd6)-MT, formed upon addition of the Zn(II) ions to 113Cd6-MT shows, 113Cd-n.m.r. features characteristic of cluster B populations containing both Cd(II) and Zn(II) ions. The overall intensity gain of the mixed cluster B resonances per Cd as to those in 113Cd6- and 113Cd7-MT suggests a stabilization effect of the bound Zn(II) ions upon the previously established intramolecular 113Cd exchange within this cluster.

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