中科院上海药物所林东海课题组和昆明动物研究所赖仞课题组合作，探索高原滇蛙裸露皮肤在长日照、强紫外线环境下抗紫外线和迅速清除自由基机制保持氧化还原平衡的分子机制。经过合作研究，研究组从滇蛙中发现了一种新型的、可以快速清除氧化自由基、具有强抗氧化功效的皮肤抗氧化多肽antioxidin-RL。

科研人员用NMR 技术解析了antioxidin-RL的溶液结构，探测了它与氧化自由基ABTS+的相互作用，发现该多肽上两个酪氨酸残基Tyr6,Tyr12与自由基形成共价结合，而半胱氨酸残基Cys10起迅速清除自由基的作用。为进一步研究和开发利用抗氧化多肽antioxidin-RL在生物医学、抗氧化保护以及化妆品研发等方面的价值提供了理论基础。

原始出处：

Free Radical Biology and Medicine doi:10.1016/j.freeradbiomed.2010.01.036

Frog skins keep redox homeostasis by antioxidant peptides with rapid radical scavenging ability

Cunbao Liua, b, 1, Jing Hongb, c, 1, Hailong Yanga, b, 1, Jing Wua, b, Dongying Maa, b, Dongsheng Lia, Donghai Linc, ,  and Ren Laia, d,

a Biotoxin Unit of the Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
b Graduate School, Chinese Academy of Sciences, Beijing, China
c Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
d Key Laboratory of Microbiological Engineering of the Agricultural Environment, Ministry of Agriculture, Life Sciences College, Nanjing Agricultural University, Nanjing, Jiangsu, China

The question of how amphibians can protect themselves from reactive oxygen species when exposed to the sun in an oxygen-rich atmosphere is important and interesting, not only from an evolutionary viewpoint, but also as a primer for researchers interested in mammalian skin biology, in which such peptide systems for antioxidant defense are not well studied. The identification of an antioxidant peptide named antioxidin-RL from frog (Odorrana livida) skin in this report supports the idea that a peptide antioxidant system may be a widespread antioxidant strategy among amphibian skins. Its ability to eliminate most of the 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) radical tested within 2 s, which is much faster than the commercial antioxidant factor butylated hydroxytoluene, suggests that it has a potentially large impact on redox homeostasis in amphibian skins. Cys10 is proven to be responsible for its rapid radical scavenging function and tyrosines take part in the binding of antioxidin-RL to radicals according to our nuclear magnetic resonance assay.