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Related Experiment Videos

Root effect of Panulirus interruptus hemocyanin

H A Kuiper, M Coletta, L Zolla

    Biochimica Et Biophysica Acta
    |December 16, 1980
    PubMed
    Summary

    The oxygen-binding capacity of Panulirus interruptus hemocyanin decreases with lower pH due to reduced oxygen affinity and cooperativity. This Root effect is linked to protein stabilization in a low-affinity state, not functional heterogeneity.

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    Area of Science:

    • Biochemistry
    • Protein Chemistry
    • Respiratory Pigments

    Background:

    • Hemocyanins are copper-containing proteins responsible for oxygen transport in many invertebrates.
    • The oxygen-binding properties of hemocyanins are sensitive to environmental factors like pH.
    • Panulirus interruptus hemocyanin (PiH) is a model system for studying hemocyanin function.

    Purpose of the Study:

    • To characterize the oxygen-binding behavior of Panulirus interruptus hemocyanin across a range of pH values.
    • To investigate the underlying mechanisms of the observed Root effect in PiH.
    • To determine if functional heterogeneity contributes to the pH-dependent oxygen-binding changes.

    Main Methods:

    • Determination of oxygen-binding curves over the complete range of oxygen saturation.

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  • Application of high-pressure spectrophotometry for precise measurements.
  • Analysis of pH-dependent changes in oxygen affinity and cooperativity.

    • Main Results:

    • A progressive decrease in oxygen affinity and cooperativity of PiH was observed with decreasing pH.
    • The Root effect was clearly related to the stabilization of a low oxygen affinity state.
    • Functional heterogeneity was not apparent in the studied system.

    Conclusions:

    • The Root effect in Panulirus interruptus hemocyanin is primarily due to the stabilization of a low-affinity state.
    • The complex pH-dependent oxygen-binding behavior cannot be fully explained by simple models like the Monod-Wyman-Changeux model.
    • The study provides insights into the allosteric regulation of hemocyanin function.