Phosphoryl transfer enolase

In the next reaction, an enol is formed by the dehydration of 2-phosphoglycerate. Enolase catalyzes the formation of phosphoenolpyruvate (PEP). This dehydration markedly elevates the transfer potential of the phosphoryl group. An enol phosphate has a high phosphoryl-transfer potential, whereas the phosphate ester, such as 2-phosphoglycerate, of an ordinary alcohol has a low one. The A G° of the hydrolysis of a phosphate ester of an ordinary alcohol is -3 kcal mofi (-13 kJ mol i), whereas that of phosphoenolpyruvate is -14.8 kcal mofi (- 62 kJ mofi). Why does phosphoenolpyruvate have such a high phosphoryl-transfer potential The phosphoryl group traps the molecule in its unstable enol form. 

In the next reaction, an enol is formed by the dehydration of 2-phosphoglycerate. Enolase catalyzes the formation of phosphoenolpyruvate (PEP). This dehydration markedly elevates the transfer potential of the phosphoryl group. An enol phosphate has a high phosphoryl-transfer potential. 

In the second glycolytic reaction that generates a compound with high phosphoryl group transfer potential, enolase promotes reversible removal of a molecule of water from 2-phosphoglycerate to yield phosphoenolpyruvate (PEP) ... 

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