Potato apyrase

Apyrase (isoenzyme of high ATPase/ADPase ratio, potato)[7] S-Aryltransferase (sheep liver... 

Fig. 6. Time course ci luminescence of firefly enzyme plus different concentrations of potato apyrase in the presence of a constant added amount of ATP. Apyrase AI(OH) treated ATP — 140 pg./0.8 ml.

Further phosphates of thiamine, thiamine monophosphate (TMP), and thiamine triphosphate (TTP) have also been found as natural products 19, 80). Kiessling has shown that potato apyrase, ch cleaves Y-phosphates, hydrolyzes TTP in the same manner as it does ATP, suggesting that the two compounds have their phosphate groups arranged in a similar manner 81). Yeast incorporates P K)4 to a greater extent into the phosphate of TTP than into any other thiamine phosphate 88). Neither TMP nor TTP possess cocarboxylase activity 83). TTP can, however, transfer its terminal phosphate enzymically to glucose, just as does ATP 84). 

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