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Kinetic scheme for Ca2+-arsenazo III interactions.

P L Dorogi, C R Rabl, E Neumann

    Biochemical and Biophysical Research Communications
    |March 29, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    Calcium ions (Ca2+) bind rapidly to arsenazo III (Ar), but the formation of the CaAr2 complex involves a slow step. This limits arsenazo III

    Area of Science:

    • Biochemistry
    • Chemical Kinetics
    • Analytical Chemistry

    Background:

    • Metallochromic dyes like arsenazo III are used to detect calcium ions.
    • Understanding the kinetics of dye-calcium complex formation is crucial for biological applications.

    Purpose of the Study:

    • To investigate the kinetic mechanisms of calcium (Ca2+) complex formation with arsenazo III (Ar).
    • To determine the rate-limiting steps in the formation of the CaAr2 complex.

    Main Methods:

    • Utilized temperature-jump relaxation kinetic studies.
    • Analyzed the complex formation between Ca2+ and arsenazo III.

    Main Results:

    • Observed a rapid complex formation mode (≤10 µs) involving Ca2+ and Na+ of arsenazo III.

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  • Identified a slower mode (≈10 ms) attributed to structural rearrangements in the 1:2 CaAr2 complex.
  • Kinetic data support a multi-step reaction scheme: Ca2+ + 2Ar ⇌ CaAr + Ar ⇌ CaAr2.

    • Conclusions:

    • The slow rate-limiting step in CaAr2 complex formation restricts the use of arsenazo III for studying rapid Ca2+ kinetics in cell biology.
    • Further research may explore alternative indicators for faster calcium signaling detection.