期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 118, 期 49, 页码 14302-14313出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp511221c
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资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba (Secyt-UNC)
Alkaline phosphatases (APs) catalyze the hydrolysis and transphosphorylation of phosphate monoesters. Quantum-mechanical computational methods were employed to study the catalytic mechanism of human placental AP (PLAP). An active-site model was used, constructed on the basis of the X-ray crystal structure of the enzyme. Kinetic and thermodynamic evaluations were achieved for each reaction step. Calculations shed light on the mechanistic differences that had been experimentally observed between aryl and alkyl phosphates, particularly regarding the rate-determining step. The functional implications of relevant residues in the active site were examined. The present theoretical study rationalizes experimental observations previously reported in the literature.
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