Singlet molecular oxygen regulates vascular tone and blood pressure in inflammation
作者:Christopher P. Stanley、Ghassan J. Maghzal、Anita Ayer、Jihan Talib、Andrew M. Giltrap、Sudhir Shengule、Kathryn Wolhuter、Yutang Wang、Preet Chadha、Cacang Suarna、Oleksandra Prysyazhna、Jenna Scotcher、Louise L. Dunn、Fernanda M. Prado、Nghi Nguyen、Jephthah O. Odiba、Jonathan B. Baell、Johannes-Peter Stasch、Yorihiro Yamamoto、Paolo Di Mascio、Philip Eaton、Richard J. Payne、Roland Stocker
DOI:10.1038/s41586-019-0947-3
日期:2019.2.28
Singlet molecular oxygen (1O2) has well-established roles in photosynthetic plants, bacteria and fungi1–3, but not in mammals. Chemically generated 1O2 oxidizes the amino acid tryptophan to precursors of a key metabolite called N-formylkynurenine4, whereas enzymatic oxidation of tryptophan to N-formylkynurenine is catalysed by a family of dioxygenases, including indoleamine 2,3-dioxygenase 15. Under
Directed Evolution of a Tryptophan 2,3‐Dioxygenase for the Diastereoselective Monooxygenation of Tryptophans
作者:Yanxin Wei、Chen Lu、Shengsheng Jiang、Yanyan Zhang、Qiuchun Li、Wen‐Ju Bai、Xiqing Wang
DOI:10.1002/anie.201911825
日期:2020.2.17
that can monooxygenate unprotected tryptophan into the corresponding 3a-hydroxyhexahydropyrrolo[2,3-b]indole-2-carboxylic acid (HPIC) in a single, scalable step with excellent turnover number and diastereoselectivity. Taking advantage of directed evolution, we analyzed the stepwise oxygen-insertion mechanism of tryptophan 2,3-dioxygenases, and transformed tryptophan 2,3-dioxygenase from Xanthomonas campestris