Bioorthogonal fluorescent labeling of functional G-protein-coupled receptors.

Bioorthogonal fluorescent labeling of functional G-protein-coupled receptors.
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DOI:
10.1002/cbic.201402193
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发表时间:
2014-08-18
期刊:
影响因子:
3.2
通讯作者:
Huber, Thomas
Huber, Thomas
中科院分区:
生物学3区
文献类型:
--
作者:
Tian, He;Naganathan, Saranga;Kazmi, Manija A.;Schwartz, Thue W.;Sakmar, Thomas P.;Huber, Thomas

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Novel methods are required for site-specific, quantitative fluorescence labeling of G protein-coupled receptors (GPCRs) and other difficult-to-express membrane proteins. Ideally, fluorescent probes should perturb native structure and function as little as possible. We evaluated bioorthogonal reactions to label genetically encoded p-acetyl-l-phenylalanine (AcF) or p-azido-l-phenylalanine (azF) residues in receptors heterologously expressed in mammalian cells. We found that keto-selective reagents were not truly bioorthogonal, possibly due to posttranslational protein oxidation reactions. In contrast, the strain-promoted [3+2] azide–alkyne cycloaddition (SpAAC) with dibenzocyclooctyne (DIBO) reagents yielded stoichiometric conjugates with azF-rhodopsin while undergoing negligible background reactions. As one useful application, we used Alexa488-rhodopsin to measure the kinetics of ligand uptake and release in membrane-mimetic bicelles using a novel fluorescence-quenching assay.
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