Acetylation of Axonal G3BP1 through ELP3 Accelerates Axon Regeneration

Area of Science:

• Neuroscience
• Cell Biology
• Molecular Biology

Background:

• Nerve injury necessitates localized mRNA translation for repair.
• G3BP1 protein sequesters axonal mRNAs in stress granules.
• G3BP1 granule dynamics are regulated by post-translational modifications like phosphorylation and acetylation.

Purpose of the Study:

• To investigate the role of G3BP1 acetylation in axonal response to nerve injury.
• To identify the mechanism regulating G3BP1 acetylation in axons.
• To determine the impact of G3BP1 acetylation on nerve regeneration and neuronal survival.

Main Methods:

• Axotomy model in rodent neurons.
• Analysis of G3BP1 post-translational modifications (acetylation).
• ELP3 depletion and overexpression studies.
• Assessment of axonal growth, protein synthesis, and neuronal survival.

Main Results:

• Rodent G3BP1 undergoes K374 acetylation after axotomy in an ELP3-dependent manner.
• Axonal G3BP1 acetylation enhances protein synthesis, accelerates nerve regeneration, and improves functional recovery.
• ELP3 depletion leads to reduced axon growth, increased G3BP1 granules, and rapid proximal axon degeneration.
• Expression of an acetylmimetic G3BP1 prevents axonal degeneration.

Conclusions:

• G3BP1 acetylation, mediated by ELP3, is a critical regulator of axonal regeneration and neuronal resilience.
• This post-translational modification links stress granule regulation to neuronal repair and protection after injury.