7TA8

NMR structure of crosslinked cyclophilin A

7TA8 の概要

• エントリーDOI: 10.2210/pdb7ta8/pdb
• NMR情報: BMRB: 30977
• 分子名称: Peptidyl-prolyl cis-trans isomerase A (1 entity in total)
• 機能のキーワード: isomerase, side chain crosslink
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 18065.50

構造登録者

Lu, M.,Toptygin, D.,Xiang, Y.,Shi, Y.,Schwieters, C.D.,Lipinski, E.C.,Ahn, J.,Byeon, I.-J.L.,Gronenborn, A.M. (登録日: 2021-12-20, 公開日: 2022-06-01, 最終更新日: 2024-10-30)

主引用文献

Lu, M.,Toptygin, D.,Xiang, Y.,Shi, Y.,Schwieters, C.D.,Lipinski, E.C.,Ahn, J.,Byeon, I.L.,Gronenborn, A.M.
The Magic of Linking Rings: Discovery of a Unique Photoinduced Fluorescent Protein Crosslink.
J.Am.Chem.Soc., 144:10809-10816, 2022

PubMed Abstract: Fluorosubstituted tryptophans serve as valuable probes for fluorescence and nuclear magnetic resonance (NMR) studies of proteins. Here, we describe an unusual photoreactivity introduced by replacing the single tryptophan in cyclophilin A with 7-fluoro-tryptophan. UV exposure at 282 nm defluorinates 7-fluoro-tryptophan and crosslinks it to a nearby phenylalanine, generating a bright fluorophore. The crosslink-containing fluorescent protein possesses a large quantum yield of ∼0.40 with a fluorescence lifetime of 2.38 ns. The chemical nature of the crosslink and the three-dimensional protein structure were determined by mass spectrometry and NMR spectroscopy. To the best of our knowledge, this is the first report of a Phe-Trp crosslink in a protein. Our finding may break new ground for developing novel fluorescence probes and for devising new strategies to exploit aromatic crosslinks in proteins.

PubMed: 35574633
DOI: 10.1021/jacs.2c02054

実験手法

SOLUTION NMR