ABSTRACTThe scope of photobiological processes that involve absorbers within a protein matrix may be limited by the vulnerability of the peptide group to attack by highly reactive redox centers consequent upon electronic excitation. We have explored the nature of this vulnerability by undertaking comprehensive product analyses of aqueous photolysates of 12 N‐p‐toluenesulfonyl peptides with systematically selected structures. The results indicate that degradation includes a major pathway that is initiated by intramolecular electron transfer in which the peptide bond serves as electron donor, and the data support the likelihood of a relay process in dipeptide derivatives.
摘要涉及蛋白质基质中吸收剂的光生物学过程的范围可能会受到肽基易受电子激发后高活性氧化还原中心攻击的限制。我们对 12 种具有系统选择结构的 N 对甲苯磺酰基肽的水光解产物进行了全面的产物分析,从而探索了这种脆弱性的本质。结果表明,降解包括一个由分子内电子转移引发的主要途径,其中肽键是电子供体,数据支持了二肽衍生物发生中继过程的可能性。