Cytidine 2′,3′-cyclic monophosphate (2′,3′-CyclicCMP) (2′,3′-cCMP) is used as a model substrate for kinetic analysis of various ribonucleases, especially ribonuclease A.
Although highly stable toward unfolding, native ribonuclease A is known to be cleaved by unspecific proteases in the flexible loop region near Ala20. With the aim to create a protease-resistant ribonuclease A, Ala20 was substituted for Pro by site-directed mutagenesis.
Isothermal titration calorimetry (ITC) and progress curve analysis was used to measure the enzyme kinetic parameters (KM and kcat) of the hydrolysis of cCMP by RNase-A, a reaction that includes end-product competitive inhibition by 3'-CMP. The heat generated from injection
Protein expression and purification, 7(3), 253-261 (1996-05-01)
Human pancreatic ribonuclease (HP-RNase) has considerable promise as a therapeutic agent. Structure-function analyses of HP-RNase have been impeded by the difficulty of obtaining the enzyme from its host. Here, a gene encoding HP-RNase was designed, synthesized, and inserted into two
European journal of biochemistry, 124(1), 151-156 (1982-05-01)
The study of the temperature dependence of the hydrolysis of cytidine 2',3'-phosphate by bovine pancreatic ribonuclease A (EC 3.1.27.5) at pH 7.0 by using the pH-stat method showed a transition at 4 degrees C [J. A. Biosca and C. M.
pH-Stat titration allows the continuous determination of ribonuclease A activity toward cytidine 2',3'-cyclic monophosphate at high substrate concentrations.
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