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Updated: Jun 20, 2025

Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
Published on: July 27, 2021
Structural basis for a highly conserved RNA-mediated enteroviral genome replication.
Naba Krishna Das1, Jeff Vogt1, Alisha Patel1
1Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, MD 21250, USA.
This study reveals the conserved H-type four-way junction structure of enteroviral replication-linked RNAs (REPLRs). These structures are crucial for recruiting PCBP2, a key protein for viral genome replication and potential therapeutic targets.
Area of Science:
- Virology
- Structural Biology
- Molecular Biology
Background:
- Enteroviruses utilize conserved 5' RNA structures for genome replication.
- High-resolution structures and mechanisms of these replication-linked RNAs (REPLRs) are not well understood.
Purpose of the Study:
- Determine the high-resolution crystal structures of REPLRs from coxsackievirus B3, rhinovirus B14, and C15.
- Investigate the interaction between REPLRs and the human protein PCBP2.
- Elucidate the mechanism of PCBP2 recruitment for viral genome replication.
Main Methods:
- X-ray crystallography to determine REPLR structures.
- Homology modeling to predict structures of other enteroviral REPLRs.
- Structure-guided binding studies using purified human PCBP2 and DNA oligonucleotides.
Main Results:
- Revealed a conserved H-type four-way junction fold in REPLRs, stabilized by an A•C•U base-triple.
- Homology modeling accurately predicted REPLR structures.
- Identified proximal binding sites (sB-loop and 3' spacer) for a single PCBP2 molecule.
- Demonstrated that the 3' spacer is critical for PCBP2 interaction and abrogated binding.
Conclusions:
- The conserved REPLR structure is essential for recruiting PCBP2.
- The 3' spacer region plays a critical role in PCBP2 binding and viral replication.
- Targeting this REPLR-PCBP2 interaction presents a promising therapeutic strategy against enteroviral infections.
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