Function:Weakly binds calcium but binds zinc very tightly-distinct binding sites with different affinities exist for both ions on each monomer. Physiological concentrations of potassium ion antagonize the binding of both divalent cations , especially affecting high-affinity calcium-binding sites. ,similarity:Belongs to the S-100 family. ,similarity:Contains 2 EF-hand domains. ,subunit:Dimer of either two alpha chains , or two beta chains , or one alpha and one beta chain. ,tissue specificity:Highly prevalent in heart. Also found in lesser quantities in skeletal muscle and brain. ,
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