该发明涉及一种非规范氨基酸,化学式为I,即A - L - X,其中A是赖氨酸或酪氨酸,L是连接物或不存在,X是氨氧基自由基,如果A是赖氨酸,L与赖氨酸的N-ε原子结合,如果L不存在,X与赖氨酸的N-ε原子结合;如果A是酪氨酸,L与酪氨酸的酚羟基结合,如果L不存在,X与酪氨酸的酚羟基结合。此外,该发明还涉及一种将自旋标记引入蛋白质的方法,以及一种改性的吡咯赖氨酰-tRNA合成酶。
A Genetically Encoded Spin Label for Electron Paramagnetic Resonance Distance Measurements
作者:Moritz J. Schmidt、Julia Borbas、Malte Drescher、Daniel Summerer
DOI:10.1021/ja411535q
日期:2014.1.29
spin-labeled proteins and obviates the need for any chemical labeling step usually required for protein electron paramagnetic resonance (EPR) studies. The amino acid can be introduced at multiple, user-defined sites of a protein and is stable in E. coli even for prolonged expression times. It can report intramolecular distance distributions in proteins by double-electron electron resonance measurements. Moreover
[EN] GENETICALLY ENCODED SPIN LABEL<br/>[FR] MARQUEUR DE SPIN CODÉ GÉNÉTIQUEMENT
申请人:UNIVERSITÄT KONSTANZ
公开号:WO2015107071A1
公开(公告)日:2015-07-23
The invention relates to a non-canonical amino acid of the formula I, namely A - L - X, A is a lysine or a tyrosine, L is a linker or absent, and X is an aminoxyl radical or photocaged aminoxyl radical, and if A is lysine, L is bound to the N-epsilon atom of the lysine or, if L is absent, X is bound to the N-epsilon atom of the lysine; and if A is tyrosine, L is bound to the phenolic hydroxyl of the tyrosine or, if L is absent, X is bound to the phenolic hydroxyl of the tyrosine. Moreover, the invention also relates to a method for introducing a spin label into a protein and to a modified pyrrolysyl-tRNA- synthetase.