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Metal-binding properties of calmodulin

C L Wang, R R Aquaron, P C Leavis

    European Journal of Biochemistry
    |May 1, 1982
    PubMed
    Summary

    Calmodulin

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    Area of Science:

    • Biochemistry
    • Protein Structure
    • Metal Ion Binding

    Background:

    • Calmodulin is a crucial calcium-binding protein.
    • Understanding calmodulin's metal-binding is key to its function.
    • Lanthanide ions serve as useful calcium analogs.

    Purpose of the Study:

    • To investigate the metal-binding properties of calmodulin using lanthanide ions.
    • To compare calmodulin's binding characteristics with its homolog, troponin C.
    • To explore the role of tyrosine residues in metal binding.

    Main Methods:

    • Utilized trivalent lanthanide ions (terbium and europium) as calcium analogs.
    • Employed competition experiments to assess binding affinities.
    • Investigated calmodulin selectively nitrated at tyrosine residues.
    • Used laser-induced direct excitation of bound europium ions.

    Main Results:

    • Identified sites I and II as high-affinity binding sites for Tb3+ and Ca2+.
    • Found that both tyrosine residues contribute to energy transfer to Tb3+.
    • Determined that only Tyr-138's fluorescence is sensitive to metal binding.
    • Observed similar microenvironments across all four metal-binding sites in calmodulin.

    Conclusions:

    • Calmodulin exhibits distinct metal-binding properties compared to troponin C.
    • Tyrosine residue 138 plays a significant role in metal ion sensing.
    • The four metal-binding sites in calmodulin share comparable environments.

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