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Tryptophan fluorescence lifetimes in lysozyme.

C Formoso, L S Forster

    The Journal of Biological Chemistry
    |May 25, 1975
    PubMed
    Summary

    Tryptophan fluorescence lifetimes in lysozyme reveal how solvent exposure and interactions between tryptophans affect protein structure and energy transfer. These insights aid in understanding protein fluorescence dynamics.

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    Area of Science:

    • Biochemistry
    • Biophysics
    • Protein Science

    Background:

    • Tryptophan fluorescence is a key tool for studying protein structure and dynamics.
    • Understanding how environmental factors and intramolecular interactions influence tryptophan fluorescence is crucial.

    Purpose of the Study:

    • To investigate tryptophan fluorescence lifetimes in lysozyme and its derivatives.
    • To elucidate the impact of solvent exposure, intramolecular contacts, and intertryptophanyl interactions on fluorescence properties.

    Main Methods:

    • Measurement of tryptophan fluorescence lifetimes at different pH values (2 and 8) for native lysozyme and modified derivatives.
    • Site-specific modification of tryptophan residues (Trp-62 and Trp-108) to assess their individual contributions.

    Main Results:

    • Tryptophan fluorescence lifetimes varied from 0.5 ns to 2.8 ns, increasing with solvent exposure but decreasing due to intramolecular contacts.
    • Evidence of intertryptophanyl energy transfer was observed between Trp-108 and Trp-62.
    • Complexation with tri-(N-acetyl-glucosamine) affected both tryptophan lifetimes and the number of emitting tryptophans.

    Conclusions:

    • Tryptophan fluorescence lifetime measurements provide valuable insights into protein conformation and dynamics.
    • Interactions between tryptophan residues significantly influence fluorescence characteristics.
    • Further conformational effects accompanying chemical modifications require consideration.

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