Optimized periphery-core interface increases fitness of the Bacillus subtilis glmS ribozyme.

Like other functional RNAs, ribozymes encode a conserved catalytic center supported by peripheral domains that vary among ribozyme sub-families. To understand how core-periphery interactions contribute to ribozyme fitness, we compared the cleavage kinetics of all single base substitutions at 152 sites across the Bacillus subtilis glmS ribozyme by high-throughput sequencing (k-seq). The in vitro activity map mirrored phylogenetic sequence conservation in glmS ribozymes, indicating that biological fitness reports all biochemically important positions.

Stick-slip unfolding favors self-association of expanded mRNA.

In Huntington's Disease (HD) and related disorders, expansion of CAG trinucleotide repeats produces a toxic gain of function in affected neurons. Expanded (exp) mRNA forms aggregates that sequester essential RNA binding proteins, dysregulating mRNA processing and translation. The physical basis of RNA aggregation has been difficult to disentangle owing to the heterogeneous structure of the CAG repeats.

Continuing development of vaccines and monoclonal antibodies against Zika virus.

The 2016 Zika virus (ZIKV) epidemic catalyzed a global effort to develop diagnostic tests, vaccines, and therapeutic treatments. However, the rapid waning epidemiology of ZIKV stalled many countermeasure development efforts. On January 31 and February 1, 2023, the National Institute of Allergy and Infectious Diseases (NIAID) hosted “Continuing Development of Vaccines and Monoclonal Antibodies Against Zika Virus,” a workshop of assembled experts from multiple fields and sectors to review the latest ZIKV research findings and develop recommendations for advancing vaccines and monoclonal antibodies.

RNA compaction and iterative scanning for small RNA targets by the Hfq chaperone.

RNA-guided enzymes must quickly search a vast sequence space for their targets. This search is aided by chaperones such as Hfq, a protein that mediates regulation by bacterial small RNAs (sRNAs). How RNA binding proteins enhance this search is little known.