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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Resolved fluorescence of the two tryptophan residues in horse apomyoglobin.

The composite fluorescence emission from the two tryptophans (W7 and W14) of horse heart apomyoglobin was explored by fluorescence quenching experiments. The fluorescence of the W7 residue is the only one involved in the quenching by iodide or trichloroethanol (TCE) titration. The fluorescence contribution of W7 is 49% of the total apomyoglobin emission, and its spectrum is red-shifted compared to the W14 emission. The fluorescence decay of Trp residues gives an average fluorescence lifetime of 2.06 ns for W14 and 2.84 ns for W7. The static fluorescence quenching by TCE was used to monitor the individual motions of the two tryptophans in apomyoglobin. The short correlation time of W7 (rho = 3 ns) explains why this residue can experience various environments without having to assume the existence of several protein conformations occurring during its lifetime emission.[1]


  1. Resolved fluorescence of the two tryptophan residues in horse apomyoglobin. Glandières, J.M., Twist, C., Haouz, A., Zentz, C., Alpert, B. Photochem. Photobiol. (2000) [Pubmed]
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