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CaMK2rep: A Highly Sensitive Genetically Encoded Biosensor for Monitoring CaMKII Activity in Mammalian Cells.

Elena Martínez-Blanco1, Raquel de Andrés1, Lucía Baratas-Álvarez1

  • 1Group of Molecular Basis of Neuronal Plasticity, Departamento de Biología Molecular, Facultad de Ciencias, and Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma de Madrid, Nicolás Cabrera 1, Madrid 28049, Spain.

Analytical Chemistry
|September 15, 2025
PubMed
Summary

A new biosensor, CaMK2rep, offers high-sensitivity monitoring of calcium/calmodulin-dependent protein kinase II (CaMKII) activity. This tool helps reveal how neurogranin (Ng) regulates CaMKII by sequestering calmodulin (CaM).

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Area of Science:

  • Molecular and Cellular Neuroscience
  • Biochemistry
  • Biosensor Technology

Background:

  • Existing genetically encoded sensors for CaMKII activity lack sensitivity and dynamic range.
  • Accurate monitoring of CaMKII signaling is crucial for understanding cellular processes and disease.
  • CaMKII plays vital roles in synaptic plasticity and neuronal function.

Purpose of the Study:

  • To develop and validate a novel, highly sensitive biosensor for CaMKII activity.
  • To investigate the role of neurogranin (Ng) in regulating CaMKII activation.
  • To demonstrate the utility of combining orthogonal biosensors for complex signaling studies.

Main Methods:

  • Development of CaMK2rep, a phosphorylation-based biosensor utilizing synapsin sequence context.
  • Validation in HeLa cells and hippocampal neurons using phospho-specific antibody detection.
  • Complementary use of the live-cell CaMKAR reporter for dynamic CaMKII activity monitoring.

Main Results:

  • CaMK2rep demonstrated robust, specific, and high-sensitivity detection of CaMKII activity.
  • The biosensor exhibited a near-linear response to CaMKII expression and stimulation intensity with no cytotoxicity.
  • Combined biosensor use provided evidence for a CaM-buffering model involving neurogranin (Ng) and calmodulin (CaM).

Conclusions:

  • CaMK2rep is a versatile and sensitive tool for CaMKII signaling research, especially for population analyses.
  • The study supports a model where Ng limits basal CaMKII activation by sequestering CaM.
  • Orthogonal biosensor combinations are valuable for dissecting complex signaling pathways in health and disease.