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Calcium-dependent alpha-helical structure in osteocalcin.

P V Hauschka, S A Carr

    Biochemistry
    |May 11, 1982
    PubMed
    Summary
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    Osteocalcin undergoes a significant structural change upon calcium binding, transitioning from a random coil to an alpha-helical conformation. This calcium-induced transformation enhances osteocalcin

    Area of Science:

    • Biochemistry
    • Structural Biology
    • Bone Metabolism

    Background:

    • Osteocalcin is a key bone protein rich in vitamin K-dependent gamma-carboxyglutamic acid (Gla) residues.
    • Gla residues are crucial for calcium binding and osteocalcin's interaction with hydroxylapatite (HA) in bone.
    • The conformational state of osteocalcin is known to be influenced by calcium ion concentration.

    Purpose of the Study:

    • To investigate the structural changes in osteocalcin induced by calcium binding.
    • To elucidate the role of Gla residues and disulfide bonds in osteocalcin's conformational transitions.
    • To develop a structural model for osteocalcin and understand its implications for bone metabolism.

    Main Methods:

    • Circular dichroism spectroscopy to assess protein secondary structure.

    Related Experiment Videos

  • Analysis of calcium binding affinity and its effect on protein conformation.
  • Predictive computational modeling based on osteocalcin sequence.

    • Main Results:

    • Metal-free osteocalcin exists as a random coil, with only 8% alpha-helical content.
    • Calcium binding induces a rapid, reversible transition to an alpha-helical conformation (38% alpha-helix).
    • The conformational change is dependent on intact disulfide bonds and diminished by Gla decarboxylation.

    Conclusions:

    • Calcium binding triggers a significant structural transition in osteocalcin, favoring an alpha-helical state.
    • The conserved arrangement of Gla residues on an alpha-helical face facilitates calcium binding and HA interaction.
    • This calcium-induced structural change likely plays a role in regulating bone metabolism.