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• W2059896189 abstract "Kinetic analysis of hydrolytic stability of 2',5'- and 3',5'-linked dinucleoside monophosphate (N(2)'pN and N(3)'pN) was successfully performed in aqueous solution at 175-240 degrees C using a new real-time monitoring method for rapid hydrothermal reactions. The half-lives of NpN were in the range 2-8 s at 240 degrees C and apparent activation energy decreases in the order U(2)'pU>A(2)'pA>G(2)'pG>U(3)pU approximately C(3)'pC>A(3)pA. The stability of phosphodiester bond was dependent on the types of base moiety and phosphodiester linkages, but no systematic correlation was found between the structure and stability. The interconversion of 2',5'-adenylyladenosine monophosphate (A(2)'pA) and 3',5'-adenylyladenosine monophosphate (A(3)'pA) was enhanced in the presence of D- or L-histidine. The rate constants of degradation of NpN were dissected into the rate constants of hydrolysis and interconversion between N(2)'pN and N(3)'pN using a computer program SIMFIT. Kinetic analysis supports the mechanism that imidazolium ion and imidazole catalyze interconversion and hydrolysis even under hydrothermal environments. The activation parameters for the hydrolysis and interconversion of NpN were systematically determined for the first time from the temperature dependence of the rate constants, where both DeltaH(app)( not equal ) and DeltaS(app)( not equal ) for 2',5'-linked NpN are larger than those for 3',5'-linked NpN. These parameters support the pseudorotation mechanism through pentacoordinate intermediate from 2',5'- and 3',5'-linked NpN, where the average value of DeltaH( not equal ) (pseudorotation) was estimated to be 30+/-18 kJ mol(-1) at 175-240 degrees C." @default.
• W2059896189 created "2016-06-24" @default.
• W2059896189 creator A5008069389 @default.
• W2059896189 date "2003-03-01" @default.
• W2059896189 modified "2023-10-11" @default.
• W2059896189 title "Kinetics and activation parameter analyses of hydrolysis and interconversion of 2′,5′- and 3′,5′-linked dinucleoside monophosphate at extremely high temperatures" @default.
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• W2059896189 doi "https://doi.org/10.1016/s0304-4165(02)00533-0" @default.
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