Adducin-Related Cellular Mechanisms in Membrane Dynamics

Adducins are a family of ubiquitous membrane-skeletal proteins that orchestrate the assembly and regulation of the spectrin–actin network beneath the plasma membrane. By capping the barbed ends of actin filaments and recruiting spectrin into head–tail oligomeric complexes, adducins stabilise membrane architecture and modulate cortical tension. Their function is finely tuned by calcium–calmodulin binding and by phosphorylation through kinases such as PKA and PKC. In erythrocytes, this control over filament length underpins cell deformability, while in non-erythroid cells adducins coordinate junctional integrity, cell migration and mechanical resilience. Emerging studies have linked adducin activity to mitotic spindle pole cohesion, vesicle trafficking and endothelial barrier regulation. Dysregulation of these mechanisms contributes to pathological states—including hypertension, vascular hyperpermeability and tumour cell invasion—highlighting adducin as a nexus between membrane dynamics and cellular physiology.

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Adducin-Related Cellular Mechanisms in Membrane Dynamics publication trend

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Technical terms

Adducin: A heteromeric actin-binding protein that caps filament barbed ends and recruits spectrin to stabilise the membrane skeleton.

Spectrin–Actin Network: A triangular meshwork of spectrin tetramers and filamentous actin supporting plasma membrane resilience and shape.

Cortical Actin Meshwork: A dense layer of actin filaments beneath the cell membrane regulated by spectrin, adducin and associated crosslinkers.

Barbed End Capping: The inhibition of actin filament elongation at the fast-growing (barbed) end, mediated by proteins such as adducin.

Membrane Blebbing: The formation of transient bulges in the plasma membrane due to local loss of cortical actin support and increased tension.

Phosphorylation: A reversible post-translational modification that alters protein activity and interactions, governing adducin’s association with binding partners.

References

1. A New Function for Adducin CALCIUM/CALMODULIN-REGULATED CAPPING OF THE BARBED ENDS OF ACTIN FILAMENTS (*). Journal of Biological Chemistry (1996).
2. Adducin Preferentially Recruits Spectrin to the Fast Growing Ends of Actin Filaments in a Complex Requiring the MARCKS-related Domain and a Newly Defined Oligomerization Domain*. Journal of Biological Chemistry (1998).
3. Adducin Regulation DEFINITION OF THE CALMODULIN-BINDING DOMAIN AND SITES OF PHOSPHORYLATION BY PROTEIN KINASES A AND C*. Journal of Biological Chemistry (1996).
4. abLIM1 constructs non-erythroid cortical actin networks to prevent mechanical tension-induced blebbing. Cell Discovery (2018).
5. Adducin Is Involved in Endothelial Barrier Stabilization. PLOS ONE (2015).
6. Adducin‐1 is essential for spindle pole integrity through its interaction with TPX2. EMBO Reports (2018).