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ALG-2 attenuates COPII budding in vitro and stabilizes the Sec23/Sec31A complex.

Jonas M la Cour1, Adam J Schindler, Martin W Berchtold

  • 1Department of Biology, University of Copenhagen, Copenhagen, Denmark.

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Calcium-binding protein ALG-2 regulates COPII vesicle budding by interacting with Sec31A. This interaction, dependent on calcium ions, attenuates vesicle formation and influences protein recruitment during transport from the ER to the Golgi.

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Protein Trafficking

Background:

  • Coated vesicles, specifically COPII (coat protein complex II), are essential for transporting proteins from the endoplasmic reticulum (ER) to the Golgi apparatus.
  • The COPII coat is composed of Sar1 GTPase, Sec23/24 inner coat proteins, and Sec13/31A outer coat proteins.
  • The Ca(2+)-binding protein ALG-2 has been identified as a Sec31A binding partner, suggesting a role in calcium-regulated COPII vesicle budding.

Purpose of the Study:

  • To investigate the role of ALG-2 and Ca(2+) in the regulation of COPII vesicle budding.
  • To elucidate the mechanism by which ALG-2 interacts with Sec31A and affects vesicle formation.
  • To determine the functional significance of the ALG-2/Sec31A interaction in COPII protein recruitment and tethering.

Main Methods:

  • In vitro assays to assess the effect of ALG-2/Ca(2+) on COPII vesicle budding.
  • Analysis of ALG-2 binding to Sec31A, focusing on the Ca(2+)-binding site (EF-hand 1).
  • Liposome-based assays to study the recruitment of COPII proteins (Sec23/24, Sec13/31A) and their interactions.

Main Results:

  • ALG-2/Ca(2+) was shown to attenuate COPII vesicle budding in vitro.
  • The inhibitory effect of ALG-2 on vesicle budding requires an intact Ca(2+)-binding site at EF-hand 1 of ALG-2.
  • ALG-2 enhanced the recruitment of Sec23/24 and Sec13/31A to artificial liposomes and mediated the binding between Sec13/31A and Sec23.

Conclusions:

  • ALG-2, in a Ca(2+)-dependent manner, acts as a negative regulator of COPII vesicle budding.
  • The interaction between ALG-2 and Sec31A is crucial for modulating COPII vesicle formation.
  • These findings reveal a novel regulatory mechanism involving ALG-2/Ca(2+) in COPII protein tethering and vesicle budding processes.