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.
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
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
pH-Stat titration allows the continuous determination of ribonuclease A activity toward cytidine 2',3'-cyclic monophosphate at high substrate concentrations.
The Journal of biological chemistry, 273(40), 25565-25572 (1998-09-25)
The kinetics of the hydrolysis of cytidine 2',3'-cyclic phosphate (C>p) to 3'-CMP by ribonuclease A are multiphasic at high substrate concentrations. We have investigated these kinetics by determining 3'-CMP formation both spectrophotometrically and by a highly specific and quantitative chemical
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