Cyclic homodimer formation by singlet oxygen-mediated oxidation of carnosine.

IF 3.8 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Frontiers in Chemistry Pub Date : 2024-08-19 eCollection Date: 2024-01-01 DOI:10.3389/fchem.2024.1425742

Hiroko Kawakami, Yuki Itakura, Tetsuya Yamamoto, Taku Yoshiya

引用次数: 0

Abstract

Although carnosine (β-Ala-L-His) is one of physiological protectants against in vivo damages caused by reactive oxygen species (ROS), its reactivity against singlet oxygen (¹O₂), an ROS, is still unclear at the molecular level. Theoretically, the reaction consists of two steps: i) oxygenation of the His side chain to form an electrophilic endoperoxide and ii) nucleophilic addition to the endoperoxide. In this study, the end product of ¹O₂-mediated carnosine oxidation was evaluated using 2D-NMR and other analytical methods both in the presence and absence of external nucleophiles. Interestingly, as the end product without external nucleophile, a cyclic homodimer was confirmed under our particular conditions. The reaction was also replicated in pork specimens.

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单线态氧介导的肌肽氧化形成环状同二聚体

虽然肌肽（β-Ala-L-His）是防止活性氧（ROS）对人体造成损害的生理保护剂之一，但它对单线态氧（1O2）（一种 ROS）的反应在分子水平上仍不清楚。理论上，该反应包括两个步骤：i）His 侧链氧合形成亲电的内过氧化物；ii）内过氧化物的亲核加成反应。在本研究中，使用二维核磁共振和其他分析方法对 1O2 介导的肌肽氧化反应的最终产物进行了评估，包括外部亲核物存在和不存在的情况。有趣的是，在我们的特定条件下，在没有外部亲核剂的情况下，最终产物被确认为环状同二聚体。该反应也在猪肉标本中得到了复制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Chemistry Chemistry-General Chemistry

CiteScore

8.50

自引率

3.60%

发文量

1540

审稿时长

12 weeks

期刊介绍： Frontiers in Chemistry is a high visiblity and quality journal, publishing rigorously peer-reviewed research across the chemical sciences. Field Chief Editor Steve Suib at the University of Connecticut is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to academics, industry leaders and the public worldwide. Chemistry is a branch of science that is linked to all other main fields of research. The omnipresence of Chemistry is apparent in our everyday lives from the electronic devices that we all use to communicate, to foods we eat, to our health and well-being, to the different forms of energy that we use. While there are many subtopics and specialties of Chemistry, the fundamental link in all these areas is how atoms, ions, and molecules come together and come apart in what some have come to call the “dance of life”. All specialty sections of Frontiers in Chemistry are open-access with the goal of publishing outstanding research publications, review articles, commentaries, and ideas about various aspects of Chemistry. The past forms of publication often have specific subdisciplines, most commonly of analytical, inorganic, organic and physical chemistries, but these days those lines and boxes are quite blurry and the silos of those disciplines appear to be eroding. Chemistry is important to both fundamental and applied areas of research and manufacturing, and indeed the outlines of academic versus industrial research are also often artificial. Collaborative research across all specialty areas of Chemistry is highly encouraged and supported as we move forward. These are exciting times and the field of Chemistry is an important and significant contributor to our collective knowledge.