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Solution structure of calcium-free calmodulin

H Kuboniwa1, N Tjandra, S Grzesiek

  • 1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.

Nature Structural Biology
|September 1, 1995
PubMed
Summary

The three-dimensional structure of calcium-binding protein calmodulin (CaM) without calcium ions reveals two flexible domains, similar to its calcium-bound state. This finding provides insights into CaM's dynamic structural changes.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biophysics

Background:

  • Calmodulin (CaM) is a crucial calcium-binding protein involved in numerous cellular signaling pathways.
  • Understanding CaM's structure in different calcium states is essential for elucidating its regulatory mechanisms.

Purpose of the Study:

  • To determine the three-dimensional structure of calmodulin in the absence of Ca2+.
  • To compare the Ca2+-free structure with the Ca2+-ligated state and other related proteins.

Main Methods:

  • Utilized three- and four-dimensional heteronuclear Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Employed Nuclear Overhauser Effect (ROE) experiments, isotope-filtering with reverse labeling, and measurement of over 700 three-bond J-couplings.

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Main Results:

  • The Ca2+-free calmodulin structure consists of two globular domains connected by a flexible linker, lacking direct inter-domain contacts.
  • Each domain features a highly twisted helical bundle capped by an anti-parallel beta-sheet.
  • This structure shares similarities with the Ca2+-free N-terminal domain of troponin C.

Conclusions:

  • Calmodulin maintains a two-domain, flexible linker architecture irrespective of calcium binding.
  • The observed structural features in the absence of Ca2+ highlight the protein's inherent flexibility and adaptability.
  • The findings contribute to a deeper understanding of calmodulin's conformational dynamics and its role in signal transduction.