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- W2075607383 abstract "Recently, it is has been shown that the C=N stretching vibration of a non-natural amino acid, p-cyano-phenylalanine (PheCN), could be used as an infrared reporter of local environment. Here, we further showed that the fluorescence emission of PheCN is also sensitive to solvent and, therefore, could be used as a novel optical probe for protein binding and folding studies. Moreover, we found that the fluorescence quantum yield of PheCN is nearly five times larger than that of phenylalanine and, more importantly, can be selectively excited even when other aromatic amino acids are present, thus making it a more versatile fluorophore. To test the feasibility of using PheCN as a practical fluorescent probe, we studied the binding of calmodulin (CaM) to a peptide derived from the CaM-binding domain of skeletal muscle myosin light chain kinase (MLCK). The peptide (MLCK3CN) contains a single PheCN residue and has been shown to bind to CaM with high affinity. As expected, addition of CaM into a MLCK3CN solution resulted in quenching of the PheCN fluorescence. A series of stochiometric titrations further allowed us to determine the binding affinity (Kd) of this peptide to CaM. Taken together, these results indicated that the PheCN fluorescence is sensitive to environment and could be applicable to a wide variety of biological problems." @default.
- W2075607383 created "2016-06-24" @default.
- W2075607383 creator A5015329154 @default.
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- W2075607383 date "2006-08-17" @default.
- W2075607383 modified "2023-10-10" @default.
- W2075607383 title "A novel fluorescent probe for protein binding and folding studies:p-cyano-phenylalanine" @default.
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- W2075607383 doi "https://doi.org/10.1002/bip.20587" @default.
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