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Calcium ions (Ca2+) regulate protein trafficking by binding to viral Gag proteins. This interaction is crucial for precise protein delivery within cells, impacting viral release and cellular homeostasis.

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Area of Science:

  • Cell Biology
  • Virology
  • Biochemistry

Background:

  • Directional protein delivery is essential for cellular function but poorly understood.
  • The HIV synapse serves as a model for studying protein complex targeting.

Purpose of the Study:

  • To investigate the mechanism of directional protein delivery using the HIV synapse model.
  • To determine the role of calcium ions (Ca2+) in the trafficking of the viral Gag protein.

Main Methods:

  • Utilized the HIV synapse as a model system for uropod targeting.
  • Analyzed the co-polarization of Gag with intracellular Ca2+ gradients.
  • Identified and mutated Ca2+ binding sites in Gag proteins.

Main Results:

  • Gag protein co-polarizes with intracellular Ca2+ gradients and binds specifically to Ca2+.
  • Conserved acidic residues flanking ESCRT-binding motifs are key Ca2+ binding sites.
  • Ca2+ binding mutations alter Gag trafficking, homo/hetero-oligomerization, and virion release.

Conclusions:

  • Ca2+-protein binding, mediated by intracellular Ca2+ gradients, is a regulatory mechanism for protein trafficking.
  • This Ca2+-dependent mechanism influences viral assembly and release.