Journal
CHEMBIOCHEM
Volume 8, Issue 7, Pages 767-774Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.200600414
Keywords
bioorganic chemistry; fluorescent probes; green fluorescent protein; protein modifications; trimethoprim
Funding
- NIGMS NIH HHS [GM071754-01] Funding Source: Medline
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The combined technologies of optical microscopy and selective probes allow for real-time analysis of protein function in living cells. Synthetic chemistry offers a means to develop specific, protein-targeted probes that exhibit greater optical and chemical functionality than the widely used fluorescent proteins. Here we describe pharmacokinetically optimized, fluorescent trimethoprim (TMP) analogues that can be used to specifically label recombinant proteins fused to E. coli dihydrofolate reductase (eDHFR) in living, wild-type mammalian cells. These improved fluorescent tags exhibited high specificity and fast labeling kinetics, and they could be detected at a high signal-to-noise ratio by using fluorescence microscopy and fluorescence-activated cell sorting (FACS). We also show that fluorescent TMP-eDHFR complexes are complements to green fluorescent protein (GFP) for two-color protein labeling experiments in cells.
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