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Related Experiment Videos

Differential modulation of SERCA2 isoforms by calreticulin

L M John1, J D Lechleiter, P Camacho

  • 1Department of Biomedical Engineering, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, USA.

The Journal of Cell Biology
|August 29, 1998
PubMed
Summary

Calreticulin modulates calcium (Ca2+) waves by interacting with specific sarcoendoplasmic reticulum Ca2+-ATPase (SERCA)2 isoforms. A key glycosylation site in SERCA2b influences calreticulin targeting and function.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Calreticulin (CRT) is an endoplasmic reticulum (ER) chaperone involved in protein folding and calcium (Ca2+) homeostasis.
  • Inositol 1,4,5-trisphosphate (IP3)-induced Ca2+ oscillations are crucial for cellular signaling and are regulated by Ca2+ uptake into the ER.

Purpose of the Study:

  • To investigate the differential effects of calreticulin on alternatively spliced isoforms of sarcoendoplasmic reticulum Ca2+-ATPase (SERCA)2.
  • To identify the molecular determinants of calreticulin's selective interaction with SERCA2 isoforms.

Main Methods:

  • Overexpression of calreticulin in Xenopus laevis oocytes.
  • Analysis of Ca2+ wave properties and oscillations.
  • Site-directed mutagenesis and glucosidase inhibition to probe protein glycosylation and function.

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Main Results:

  • Calreticulin overexpression suppressed IP3-induced Ca2+ oscillations, suggesting inhibition of ER Ca2+ uptake.
  • SERCA2a and SERCA2b isoforms exhibited distinct Ca2+ wave properties and sensitivities to calreticulin.
  • A specific glycosylation site (N1036) in SERCA2b was critical for calreticulin's selective targeting and functional modulation.

Conclusions:

  • Calreticulin differentially modulates SERCA2 isoforms, impacting Ca2+ signaling.
  • Glycosylation plays a key role in the specific interaction between calreticulin and SERCA2b.
  • Calreticulin's role extends beyond immature protein folding to dynamically modulating mature glycoprotein function.