SNOR Protein Triggers Resumption of Protein Synthesis in Dormant Cells

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A newly discovered protein called SNOR acts as a critical “all-clear” signal that allows dormant cells to rapidly resume protein synthesis when nutrients return, according to research published May 13, 2026 in Nature. The finding redefines how eukaryotic cells manage metabolic stress and could have implications for drug resistance in fungal infections, cancer cell dormancy, and synthetic biology approaches to controlling cellular activity.

The study, conducted by researchers at the University of Virginia, EMBL, Vanderbilt University, and Cornell University, used high-resolution in situ cryo-electron tomography to visualize how SNOR interacts with ribosomes during glucose depletion-induced dormancy in the fission yeast Schizosaccharomyces pombe. Unlike traditional hibernation factors that suppress ribosome activity, SNOR binds to the peptidyl transferase center and primes ribosomes for rapid reactivation.

How SNOR enables rapid recovery

When glucose becomes available again, SNOR collaborates with the hypusinated loop of eukaryotic initiation factor 5A (eIF5A) to promote the efficient recovery of polysomes—the clusters of ribosomes actively translating mRNA—and enable cells to exit dormancy. Without SNOR, ribosomes fail to restart protein synthesis even when glucose is restored, demonstrating its essential role in the process.

“This work reveals that translation restart is a highly regulated process, not just a passive recovery,” said Ahmad Jomaa of the University of Virginia, senior author of the study. “SNOR acts as a molecular switch that couples carbon-source availability to ribosomal surveillance and reactivation.”

The research shows that dormant cells can devote up to 50% of their cellular energy to protein synthesis during normal growth, but this activity is suppressed during nutrient deprivation. The study’s findings suggest that similar mechanisms may operate in other eukaryotic systems, including plants, animals, and even cancer cells, where dormancy contributes to treatment resistance.

Broader implications for biology and medicine

The discovery could have significant implications for understanding how pathogenic fungi evade antifungal drugs by entering dormant states. Slow-growing or dormant fungal cells are less susceptible to conventional treatments, and the SNOR mechanism may help explain how they persist in host tissues for extended periods before reactivating.

“This adds a new layer to how cells control protein synthesis under stress,” Jomaa noted. “It challenges the idea that recovery from dormancy is simply a passive process.” The team’s work integrates structural biology, biochemistry, and physiology to provide a comprehensive view of how cells manage metabolic stress at the molecular level.

Methodological advances

The study employed cryo-electron tomography to visualize SNOR’s interactions with ribosomes in their native cellular environment. This high-resolution imaging technique allowed researchers to observe how SNOR binds to the ribosome’s peptidyl transferase center—a key site for protein synthesis—and interacts with eIF5A during dormancy.

Previous research had identified hibernation factors that suppress ribosome activity during stress, but SNOR represents a distinct class of ribosome-associated factors that actively prepare ribosomes for reactivation. The findings suggest that cells use a two-step process to manage dormancy: first suppressing protein synthesis during stress, then licensing ribosomes for rapid recovery when conditions improve.

Next steps and potential applications

The research team is now exploring whether SNOR or similar proteins exist in mammalian cells and whether they play a role in disease states such as cancer or neurodegenerative conditions. They are also investigating whether targeting SNOR or its interactions could provide new therapeutic strategies for treating fungal infections or manipulating cell dormancy in biotechnological applications.

“This is a wonderful example of how integrating multiple scales—from structural biology to cellular physiology—can uncover fundamental mechanisms,” said Simone Mattei of EMBL, a co-author of the study. “We’re excited to see where this leads in terms of both basic science and potential applications.”

The study was supported by collaborations between the University of Virginia, EMBL, Vanderbilt University, and Cornell University, with funding from unspecified research grants. The full paper, titled “SNOR promotes translation restart after dormancy,” is available in the May 13, 2026 issue of Nature.