Abstract
1. 1. The binding of Zn 2+ to soluble proteins of intestinal mucosa of winter flounder was examined using an equilibrium dialysis technique. 2. 2. There appeared to be more than one binding system present for Zn 2+ in the mucosal cytosol. 3. 3. It required four times the normal endogenous Zn 2+ level found in the mucosal cytosol to saturate the highest affinity ( K 1 = 2.42 × 10 7 ) binding system. 4. 4. Of 10 metals tested Cu 2+ was the only one which interfered with Zn 2+ binding to the mucosal cytosol proteins. 5. 5. It is postulated that binding proteins in the mucosal cytosol of winter flounder may play a role in the transport of Zn 2+.
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