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Related Concept Videos

Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...

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Evaluating protein complexes between human aquaporin and calmodulin using biomolecular fluorescence complementation.

Jessica Glas1, Johanna Landén1, Kristina Hedfalk2

  • 1Department of Chemistry and Molecular Biology, Gothenburg University, Göteborg, 405 30, Box 462, Sweden.

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This study screened human aquaporins (AQPs) for interactions with calmodulin (CaM) in yeast. Researchers validated CaM binding to hAQP1 and hAQP4, and found strong evidence for CaM interaction with hAQP8 and hAQP9.

Keywords:
Saccharomyces cerevisiaeAquaporinBimolecular fluorescence complementationCalmodulin

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Area of Science:

  • Membrane biophysics
  • Protein-protein interactions
  • Molecular biology

Background:

  • Aquaporins (AQPs) facilitate transmembrane water and solute transport.
  • Calmodulin (CaM) is a key calcium-binding protein regulating various cellular processes.
  • CaM's role in modulating specific eukaryotic aquaporin function is increasingly recognized.

Purpose of the Study:

  • To systematically investigate interactions between all 13 human aquaporin (hAQP) homologues and calmodulin (CaM) in vivo.
  • To identify novel CaM-binding hAQPs and understand their regulation.
  • To establish a high-throughput screening method for membrane protein interactions.

Main Methods:

  • Recombinant expression of 13 human aquaporins in yeast Saccharomyces cerevisiae.
  • High-throughput screening using flow cytometry and microscopy.
  • Bimolecular Fluorescence Complementation (BiFC) assays to detect protein complex formation.
  • In silico analysis of potential CaM binding sites.

Main Results:

  • Validated CaM binding to hAQP1 and hAQP4, building on known hAQP0-CaM interactions.
  • Observed significant CaM interaction signals for hAQP8 and hAQP9, independent of their production levels.
  • Demonstrated a robust yeast-based system for screening CaM-aquaporin interactions.

Conclusions:

  • Calmodulin interacts with a subset of human aquaporins, including novel interactions with hAQP8 and hAQP9.
  • The developed Bimolecular Fluorescence Complementation (BiFC) system in yeast is effective for discovering membrane protein interactions.
  • These findings provide new insights into the regulatory mechanisms of human aquaporins by calmodulin.