Generality of Solvation Effects on the Hydrolysis Rates of Phosphate Monoesters and Their Possible Relevance to Enzymatic Catalysis Export

@article{citeulike:274018, abstract = {Previous work by Kirby and co-workers revealed a significant acceleration of the rate of hydrolysis of p-nitrophenyl phosphate by added dipolar solvents such as DMSO. Activation parameters and kinetic isotope effects have been measured to ascertain the origin of this effect. The generality of this phenomenon was examined with a series of esters with more basic leaving groups. Computational analyses of the effects of desolvation of dianionic phosphate monoesters were carried out, and the possible effect of the transfer from water to the active site of alkaline phosphatase was modeled. The results are consistent with a desolvation-induced weakening of the P-O ester bond in the ground state. Other aryl phosphate esters show similar rate accelerations at high fractions of DMSO, but phenyl and methyl phosphates do not, and their hydrolysis reactions are actually slowed by these conditions.}, author = {Grzyska, Piotr K. and Czyryca, Przemyslaw G. and Golightly, Justin and Small, Kelly and Larsen, Paul and Hoff, Richard H. and Hengge, Alvan C.}, citeulike-article-id = {274018}, citeulike-linkout-0 = {http://pubs.acs.org.ezproxy.library.drexel.edu/cgi-bin/article.cgi/joceah/2002/67/i04/html/jo016104p.html}, journal = {Journal of Oganic Chemistry}, keywords = {orgo}, month = {January}, number = {6}, pages = {1214--1220}, posted-at = {2005-08-04 19:42:02}, priority = {3}, title = {Generality of Solvation Effects on the Hydrolysis Rates of Phosphate Monoesters and Their Possible Relevance to Enzymatic Catalysis}, url = {http://pubs.acs.org.ezproxy.library.drexel.edu/cgi-bin/article.cgi/joceah/2002/67/i04/html/jo016104p.html}, volume = {67}, year = {2002} }

TY - JOUR ID - citeulike:274018 L3 - citeulike-article-id:274018 N2 - Previous work by Kirby and co-workers revealed a significant acceleration of the rate of hydrolysis of p-nitrophenyl phosphate by added dipolar solvents such as DMSO. Activation parameters and kinetic isotope effects have been measured to ascertain the origin of this effect. The generality of this phenomenon was examined with a series of esters with more basic leaving groups. Computational analyses of the effects of desolvation of dianionic phosphate monoesters were carried out, and the possible effect of the transfer from water to the active site of alkaline phosphatase was modeled. The results are consistent with a desolvation-induced weakening of the P-O ester bond in the ground state. Other aryl phosphate esters show similar rate accelerations at high fractions of DMSO, but phenyl and methyl phosphates do not, and their hydrolysis reactions are actually slowed by these conditions. IS - 6 JF - Journal of Oganic Chemistry EP - 1220 TI - Generality of Solvation Effects on the Hydrolysis Rates of Phosphate Monoesters and Their Possible Relevance to Enzymatic Catalysis VL - 67 SP - 1214 KW - orgo AU - Grzyska, Piotr AU - Czyryca, Przemyslaw AU - Golightly, Justin AU - Small, Kelly AU - Larsen, Paul AU - Hoff, Richard AU - Hengge, Alvan PY - 2002/01// UR - http://pubs.acs.org.ezproxy.library.drexel.edu/cgi-bin/article.cgi/joceah/2002/67/i04/html/jo016104p.html ER -