Abstract
Triplet tryptophanTTrpH quenching the by nucleotides adenosine-5′-monophosphate (AMP), cytidine-5′-monophosphate (CMP), guanosine-5′-monophosphate (GMP), and uridine-5′-monophosphate (UMP) is reported for the first time. The quenching rate constants for AMP, CMP, and UMP are of the same orderkq=(3–6)·108 M−1s−1, for GMP this value is 5.6·107 M−1s−1. This difference correlates with the reduction potentials of the nucleotides under study, pointing at the involvement of the electron transfer process.TTrpH quenching by AMP, CMP, and GMP does not result in the radical formation, whereas in the reaction ofTTrpH with UMP radicals are formed with the quantum yield Φ≈0.13, the, radical formation is confirmed by both laser flash photolysis and time-resolved chemically induced dynamic nuclear polarization measurements.
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