Thiamin triphosphate (ThTP) can transfer phosphate to a few proteins. Animal tissues contain a membrane-associated as well as a soluble thiamine triphosphatase that can dephosphorylate ThTP. Only the soluble enzyme was characterized in calf (Lakaye et al, 2002).
De Pauw, E,
thiamin-triphosphatase activity of THTPA:Mg2+ [cytosol]