Scientists reveal how neurons endure energy crises with paired ribosomes

A new study from the Max Planck Institute for Brain Research has uncovered how neurons survive energy shortages. Under stress, these cells pair inactive ribosomes together, saving energy while staying ready for rapid recovery. The discovery reveals a previously unknown mechanism controlled by RNA structures.

The research team, led by Erin Schuman, used high-resolution 3D imaging to observe ribosome behaviour in stressed animal cells. For the first time, cryo-electron tomography allowed them to directly visualise these paired ribosomes—called disomes—in intact, frozen cells. Unlike bacteria, animal cells rely on long, flexible RNA 'tentacles' to link ribosomes in a reversible bond.

The key player is expansion segment 31b, a section of RNA that forms a 'kissing loop' connection between ribosomes. This pairing keeps them inactive but poised for quick reactivation when conditions improve. Neurons, which demand high energy, especially benefit from this system during food scarcity.

The study combined cell biology, biochemistry, and genetic experiments across yeast and mammalian cells. Disrupting the disome formation impaired cell growth and stress tolerance, highlighting its importance. While no immediate therapies are proposed, the findings suggest new ways to study ribosome regulation in neurological diseases.

This RNA-based mechanism offers a clearer picture of how cells manage stress at the molecular level. By pairing ribosomes, neurons conserve energy without losing the ability to restart protein production quickly. The insights may eventually guide research into treatments for stress-related disorders and improve understanding of neuronal resilience.