Calcium that enters the cell during smooth muscle excitation binds with
a. myosin
b. actin
c. troponin
d. inactive myosin kinase
e. calmodulin

Respuesta :

Calcium that enters the cell during smooth muscle excitation binds with calmodulin.

What is calmodulin?

  • All eukaryotic cells express calmodulin, a multifunctional intermediate messenger protein that binds calcium.
  • Calmodulin is an intracellular target of the secondary messenger Ca2+, and Ca2+ binding is necessary for calmodulin activation.
  • Various calcium-sensitive enzymes, ion channels, and other proteins get signals from calmodulin, a protein that functions as an intermediate protein that senses calcium levels.
  • All eukaryotic cells have the calcium-binding protein calmodulin, also known as calcium-modulated protein, in their cytoplasm.
  • It interacts with a large number of other proteins in the cell and performs a wide range of biological tasks as a regulator or effector molecule.
  • Calmodulin binds calcium and magnesium.
  • Different calcium-calmodulin complexes then bind to and activate enzymes that control cellular calcium or cyclic nucleotides as well as particular protein kinases that control target enzymes by ATP-dependent phosphorylation.

Learn more about calmodulin here:

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