Transformation of 6-tetrahydrobiopterin in aqueous solutions under UV-irradiation
作者:Taisiya A. Telegina、Tamara A. Lyudnikova、Andrey A. Buglak、Yulia L. Vechtomova、Mikhail V. Biryukov、Vladimir V. Demin、Mikhail S. Kritsky
DOI:10.1016/j.jphotochem.2017.07.029
日期:2018.3
vitiligo. (H4Bip), as the phenylalanine 4-hydroxylase coenzyme, catalyzes the oxidation of phenylalanine to tyrosine (a melanin precursor). In this context, photo-transformation of H4Bip in aqueous buffer solutions has been studied. HPLC–MS/MS has demonstrated that pterin products of H4Bip autoxidation (7,8-dihydropterin (H2Ptr), dihydroxanthopterin and pterin) predominate over biopterin products (7
黑色素生成障碍导致几种病理,包括白癜风疾病。紫外线(UV)窄带光疗(308或311 nm)用于治疗白癜风。然而,光疗的机理尚不清楚。白癜风伴随着(6 R)-1-赤型5,6,7,8-四氢生物蝶呤(H 4 Bip)的新合成增加了三倍,其过量和进一步氧化可被认为是引起白癜风的重要因素。白癜风的发病机理。(H 4 Bip),作为苯丙氨酸4-羟化酶的辅酶,催化苯丙氨酸氧化为酪氨酸(黑色素前体)。在这种情况下,H 4发生光转化已经研究了在缓冲水溶液中的浸泡。HPLC-MS / MS已证明,H 4 Bip自氧化的蝶呤产品(7,8-二氢蝶呤(H 2 Ptr),二氢黄蝶呤和蝶呤)比生物蝶呤产品(7,8-二氢双蝶呤(H 2 Bip)和生物蝶呤)占优势。我们已经表明,紫外线辐射加速了自氧化,而H 4 Bip的氧化降解产物充当了光敏剂。H的光氧化的显着特点4从自氧化的Bip是dihydropterin的形成(Н 2