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  • Title: The tertiary amine local anesthetic dibucaine binds to the membrane skeletal protein spectrin.
    Author: Mondal M, Chakrabarti A.
    Journal: FEBS Lett; 2002 Dec 18; 532(3):396-400. PubMed ID: 12482599.
    Abstract:
    The quinoline-based tertiary amine dibucaine has been shown to bind the membrane skeletal protein spectrin with a dissociation constant of 3.5x10(-5) M at 25 degrees C. Such binding is detected by monitoring the quenching of the tryptophan fluorescence intensity with increasing concentrations of dibucaine only and not with the benzene-based local anesthetics procaine, tetracaine and lidocaine. Binding of dibucaine also indicated changes in the tertiary structure of spectrin indicated by a circular dichroism spectrum in the near-UV region due to absorption of the aromatic side chains. The thermodynamic parameters associated with the binding indicated the interaction of dibucaine and spectrin to be enthalpy-driven and insensitive to an increase in the ionic strength of the buffer.
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