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Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
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Crystal Structure of the N-terminal Domain of Ryanodine Receptor from Plutella xylostella
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Lobe-specific calmodulin binding to different ryanodine receptor isoforms.

Kelvin Lau1, Mandy M Y Chan, Filip Van Petegem

  • 1Department of Biochemistry and Molecular Biology, Life Sciences Institute, University of British Columbia , Vancouver, British Columbia V6T 1Z3, Canada.

Biochemistry
|January 23, 2014
PubMed
Summary
This summary is machine-generated.

Calmodulin (CaM) binding to ryanodine receptors (RyRs) varies between muscle types and Ca(2+) levels. Specific RyR regions and mutations impact CaM binding, influencing Ca(2+) release channel function.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Ryanodine receptors (RyRs) are crucial Ca(2+) release channels in muscle.
  • Calmodulin (CaM) is a Ca(2+) binding protein that modulates RyR activity.
  • Isoform-specific differences in RyR function are critical for cellular processes.

Purpose of the Study:

  • To investigate the binding characteristics of CaM to different RyR regions.
  • To compare CaM binding in skeletal (RyR1) and cardiac (RyR2) isoforms.
  • To elucidate the role of Ca(2+) and disease mutations in CaM-RyR interactions.

Main Methods:

  • Isothermal titration calorimetry (ITC) was used to quantify CaM binding.
  • Analysis of CaM domain binding to specific RyR regions.
  • Comparison of binding under Ca(2+)-loaded and Ca(2+)-free conditions.

Main Results:

  • CaM binds to all three analyzed RyR regions in both RyR1 and RyR2 isoforms.
  • Distinct CaM binding modes were observed in two RyR segments.
  • A Ca(2+)/CaM and apoCaM binding site was identified in the C-terminal region of RyRs.
  • Malignant hyperthermia and central core disease mutations in RyR1 affect CaM binding energetics and mode.

Conclusions:

  • CaM interaction with RyRs is complex and isoform-specific.
  • The identified C-terminal binding site is critical for CaM modulation of RyR function.
  • Disease-associated mutations disrupt CaM binding, providing insight into RyR-related disorders.