Tyrosinase catalyzed oxidation of 5,6-dihydroxyindole () in the presence of glutathione leads in the early stages to an unstable 1:1 adduct which has been isolated and identified as 4-S-glutathionyl-5,6-dihydroxyindole (). Under similar conditions, 5,6-dihydroxy-1-methylindole () reacts with L-cysteine ethyl ester () or N-acetyl-L-cysteine () to give the analogous adducts or , presumably by a mechanism
在
谷胱甘肽存在下,
酪氨酸酶催化的5,6-二羟基
吲哚()氧化会导致早期的1:1不稳定加合物,该加合物已被分离并鉴定为4-S-
谷胱甘肽5,6-二羟基吲哚()。在相似的条件下,5,6-二羟基-
1-甲基吲哚()与
L-半胱氨酸乙酯()或
N-乙酰基-L-半胱氨酸()反应生成类似的加合物,或者大概是通过涉及添加巯基酶解生成1-甲基-5,6-
吲哚醌。根据观察到的某些单电子氧化剂(如过
硫酸铵,Fe 2+ -
EDTA / H 2 O 2)的能力来讨论这种机制。和
铜离子,以实现的耦合和与得到相同的加成物和。