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• W2079771616 abstract "Abstract— –Flash photolysis of aqueous lysozyme has shown that the initial photochemical products are photo-oxidized tryptophan residues (Λmax= 500 nm), hydrated electrons (Λmax= 720 nm), and the cystine residue electron adduct (Λmax= 420 nm). Comparisons with mixtures of the chromophoric amino acids show that 1 to 2 tryptophan residues provide electrons at a quantum yield of 0.018 (25 per cent). Part of the ejected electrons are captured by cystine residues via a short-range, intramolecular process with essentially unit efficiency. The remainder become hydrated and back react with oxidized tryptophan residues before 10-4sec. The cystine residue electron adduct decays with 2 msec halftime (25°C) and 1.5 kcal/mole activation energy. The surviving oxidized tryptophan residues decay with a comparable time constant in a hydroxyl ion catalyzed process. In acid solutions the oxidized tryptophan residue and long-lived H atom adduct are observed (Λmax= 380 nm). The quantum yield of lysozyme inactivation induced by xenon flash irradiation above 250 nm is 0.023 (20 per cent), which is not sensitive to oxygen or pH. Comparison to the primary photochemical reactions indicates that electron ejection from the essential tryptophan residues inactivates the enzyme, irrespective of the electron trap and subsequent reactions. On the basis of the structure and supporting information it is proposed that the tryptophan residues of the active site are involved. Direct disruption of cystine residues does not contribute more than 10 per cent to the inactivation quantum yield in this wavelength region. Lysozyme inactivation may differ from other enzymes because the chromophores include essential residues located in the active center." @default.
• W2079771616 created "2016-06-24" @default.
• W2079771616 creator A5080144527 @default.
• W2079771616 creator A5088217750 @default.
• W2079771616 date "1971-03-01" @default.
• W2079771616 modified "2023-10-18" @default.
• W2079771616 title "FLASH PHOTOLYSIS AND INACTIVATION OF AQUEOUS LYSOZYME" @default.
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• W2079771616 doi "https://doi.org/10.1111/j.1751-1097.1971.tb06106.x" @default.
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