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There are three types of reactions postulated for the reaction between tannins (or rather Tannic acid) and proteins. 1. Tannic acid forms chemical bonds with basic amino acids in the protein chain. For example it bonds with the amino acid arginine at a pH 0f 3.5 where as it bonds with lysine at pH 7.5 when the tannic acid concentration is 2.5% 2. If the concentration of tannic acid is low (0.01% or 0.06 mM), only electrostatic interactions occur at pH7.5 resulting in the precipitation of proteins. 3. Hydrogen bonding is another mechanism by which tannins react with proteins if heavy metal are present. Google books on electron microscopy discusses these reaction and specific conditions in detail. I just did it by searching Google using the Key words "Tannin", "protein" and "reactions"

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