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• W2080294217 endingPage "9259" @default.
• W2080294217 startingPage "9254" @default.
• W2080294217 abstract "We present the first pressure-versus-temperature phase diagram for the helix-to-coil transition of double stranded nucleic acids. The thermodynamic stability of a nucleic acid duplex is a complex function of temperature and pressure and strongly depends on the denaturation temperature, T(M), of the duplex at atmospheric pressure. Depending upon T(M), pressure, and temperature, the phase diagram shows that pressure may stabilize, destabilize, or have no effect on the conformational state of DNA. To verify the phase diagram, we have conducted high-pressure UV melting experiments on poly(dIdC)poly(dIdC), a DNA duplex, poly(rA)poly(rU), an RNA duplex, and poly(dA)poly(rU), a DNA/RNA hybrid duplex. The T(M) values of these duplexes have been modulated by altering the solution ionic strength. Significantly, at low salt, these three duplexes have helix-to-coil transition temperatures of 50 degrees C or less. In agreement with the derived phase diagram, we found that the polymeric duplexes were destabilized by pressure if the T(M) is < approximately 50 degrees C. However, these duplexes were stabilized by pressure if the T(M) is > approximately 50 degrees C. The DNA/RNA hybrid duplex, poly(dA)poly(rU), with a T(M) of 31 degrees C in 20 mM NaCl undergoes a pressure-induced helix-to-coil transition at room temperature. This is the first report of pressure-induced denaturation of a nucleic acid duplex and provides new insights into the molecular forces stabilizing these structures." @default.
• W2080294217 created "2016-06-24" @default.
• W2080294217 creator A5021213313 @default.
• W2080294217 creator A5041182519 @default.
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• W2080294217 date "2001-08-29" @default.
• W2080294217 modified "2023-10-18" @default.
• W2080294217 title "On the Stability of Double Stranded Nucleic Acids" @default.
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• W2080294217 doi "https://doi.org/10.1021/ja004309u" @default.
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• W2080294217 hasPublicationYear "2001" @default.
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