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• W1551819979 abstract "Abstract The reaction of H atoms with anaerobic aqueous ribonuclease at pH 2.2–6.7 was investigated by means of the technique of pulse radiolysis-kinetic spectroscopy. Primary, secondary and tertiary absorption spectra were observed at intervals of the order of 10−5 sec, 10−2 sec, and 10 sec, respectively, after pulsing. The primary spectrum, generated with a specific second order rate, k[ribonuclease + H], equal to 1.5·1010 M−1·sec−1, is ascribed to the products of addition of H atom to ribonuclease. The primary spectrum indicates that attachment of H to SS links is an important primary process. The primary spectrum transforms into the secondary spectrum in a first order process, k[p → s] approx. 103 sec−1. The difference between the primary and secondary spectra indicates that sulfur radicals disappear and radicals derived from aromatic groups are formed in the intramolecular reaction responsible for this spectral change. The secondary spectrum transforms into the tertiary spectrum in a first order process, k[s → t] approx. 1 sec−1. The difference between the secondary and tertiary spectra suggests the disappearance of radicals derived from aromatic groups in the corresponding intramolecular reaction. The stable spectrum which is ultimately generated is characterized, inter alia, by diminished absorption at wavelengths characteristic of aromatic groups. Added O2 reacts both with H atoms and with the primary species formed by their reaction with ribonuclease. The data obtained in this study are consistent with the results of prior steady state studies of deactivation of aqueous ribonuclease by H atoms generated either externally or by radiolysis which showed that several amino acids containing divalent sulfur or aromatic groups are chemically altered within one ribonuclease molecule following addition of a single H atom." @default.
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• W1551819979 date "1972-03-01" @default.
• W1551819979 modified "2023-09-27" @default.
• W1551819979 title "Fast consecutive radical processes within the ribonuclease molecule in aqueous solution" @default.
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• W1551819979 doi "https://doi.org/10.1016/0005-2795(72)90155-9" @default.
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