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Background: The microscopic events of ribonuclease (RNase) catalyzed phosphoryl transfer reactions are still a matter of debate in which the contenders adhere to either the classical concerted acid-base mechanism or a more sequential triester-like mechanism. In the case of RNase A, small thio-effects of the nonbridging oxygens have been invoked in favor of the classical mechanism. However, the RNase...
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