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Related Experiment Videos

Signal transduction versus buffering activity in Ca(2+)-binding proteins

N J Skelton1, J Kördel, M Akke

  • 1Department of Molecular Biology, Scripps Research Institute, La Jolla, California 92037, USA.

Nature Structural Biology
|April 1, 1994
PubMed
Summary

Researchers studied calbindin D9k using NMR spectroscopy. They found its calcium-binding mechanism is less responsive than previously modeled, revealing novel ways these protein domains adapt to function.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biophysics

Background:

  • Calmodulin superfamily proteins are crucial calcium sensors.
  • Understanding calcium binding's structural impact is key to protein function.

Purpose of the Study:

  • To determine the three-dimensional structure of calbindin D9k without calcium.
  • To analyze the effects of calcium binding on calbindin D9k structure.
  • To compare calbindin D9k's response to calcium with other calmodulin superfamily members.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy in solution.
  • Structural determination of calbindin D9k.

Main Results:

  • The three-dimensional structure of apo-calbindin D9k was elucidated.

Related Experiment Videos

  • Calbindin D9k exhibits a significantly attenuated conformational response to Ca2+ binding compared to calmodulin and troponin C.
  • A novel mechanism for modulating Ca2+ binding responses in this protein family was identified.

    • Conclusions:

    • Calbindin D9k employs a unique strategy to regulate its response to calcium.
    • This study provides insights into the fine-tuning of Ca2+-binding domains for specific functional requirements.
    • The findings advance our understanding of calcium signaling and protein adaptation.