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Related Experiment Videos

Calcium-myristoyl protein switch.

S Zozulya1, L Stryer

  • 1Department of Cell Biology, Stanford University School of Medicine, CA 94305.

Proceedings of the National Academy of Sciences of the United States of America
|December 1, 1992
PubMed
Summary

Calcium binding to recoverin protein exposes hydrophobic surfaces and extrudes its myristoyl group. This myristoylation is crucial for recoverin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Recoverin is an EF-hand calcium-binding protein crucial for vision.
  • Retinal rod cell recoverin possesses a myristoyl group at its N-terminus.

Purpose of the Study:

  • To investigate the biological role of the myristoyl group in recoverin function.
  • To understand how calcium binding affects recoverin's interaction with hydrophobic surfaces and membranes.

Main Methods:

  • Studied unmyristoylated and myristoylated recombinant recoverin.
  • Utilized phenyl-agarose binding assays to assess hydrophobic interactions.
  • Employed rod outer segment membranes and phosphatidylcholine vesicles for lipid bilayer interaction studies.

Main Results:

  • Calcium binding induced phenyl-agarose binding in both forms of recoverin, indicating exposed hydrophobic surfaces.
  • Calcium binding induced membrane and vesicle binding only in myristoylated recoverin, suggesting myristoyl group extrusion.
  • Myristoylation facilitates recoverin's insertion into lipid bilayers.

Conclusions:

  • Calcium binding to recoverin has dual effects: exposing hydrophobic regions and extruding the myristoyl group.
  • The myristoyl group plays an active role in calcium signaling by recoverin and related proteins.
  • Myristoylation is essential for recoverin's membrane association in response to calcium.

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