Researchers have long struggled to visualize ribosomes in their native cellular environments. Traditionally, scientists purified or reconstituted samples to study these complex structures. However, this process often strips away essential proteins or traps ribosomes in unnatural states. Consequently, many researchers found it difficult to observe the full diversity of structural heterogeneity present in living cells. To solve this, a new method called cryoPRISM ribosome imaging offers a rapid, purification-free workflow.

Specifically, this approach combines cell lysis and vitrification with advanced image analysis. By skipping the purification step, the technique preserves delicate interactions and native structural states. Furthermore, the speed and accessibility of this workflow make it superior to traditional tomography. While in situ tomography preserves context, it often lacks high resolution and throughput. In contrast, this new ex vivo method provides high-quality data quickly.

Advancing Structural Biology with cryoPRISM Ribosome Imaging

In a recent study using Escherichia coli, scientists resolved more than 20 distinct ribosomal configurations. These states span the entire lifecycle, including assembly, elongation, and quiescence. Most notably, they identified a novel configuration where Elongation Factor G (EF-G) binds to idle ribosomes alongside the hibernation factor RaiA. This discovery highlights the complexity of bacterial survival mechanisms. Therefore, this tool will likely become standard for exploring bacterial biology and developing new antimicrobial strategies.

What is cryoPRISM?

CryoPRISM (purification-free ribosome imaging from subcellular mixtures) is a rapid workflow that allows scientists to analyze ribosomal structures directly from cell lysates without time-consuming purification steps.

Why is avoiding purification important in structural biology?

Purification can remove associated protein factors or force ribosomes into artificial states. Consequently, purification-free methods better reflect the actual diversity and interactions found within a living cell.

How does this discovery help clinical medicine?

By resolving states like ribosome hibernation, researchers can identify how bacteria survive stress and antibiotics. This knowledge is crucial for developing novel drugs that target persistent bacterial infections.

Disclaimer: This content is for informational and educational purposes only. It is not intended as medical advice or as a substitute for professional healthcare guidance. Always seek the advice of a qualified physician or other health provider with any questions regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

May MB et al. Capturing ribosomal structures in cellular extracts with cryoPRISM: A purification-free cryoEM approach reveals novel structural states. Proc Natl Acad Sci U S A. 2026 Mar 03. doi: 10.1073/pnas.2521210123. PMID: 41739560.

Polikanov YS, Blaha GM, Steitz TA. How hibernation factors RMF, HPF, and YfiA turn off protein synthesis. Science. 2012;337(6097):915-918. doi: 10.1126/science.1223697.

Feaga HA, Dworkin J. Ribosome hibernation: a survival strategy for bacteria. Curr Genet. 2021;67(1):61-66. doi: 10.1007/s00294-020-01121-3.