Cis-active RNA elements (CREs) and picornavirus RNA replication.
Our understanding of picornavirus RNA replication has improved over the past 10 years, due in large part to the discovery of cis-active RNA elements (CREs) within picornavirus RNA genomes. CREs function as templates for the conversion of VPg, the Viral Protein of the genome, into VPgpUpU(OH). These so called CREs are different from the previously recognized cis-active RNA sequences and structures within the 5' and 3' NTRs of picornavirus genomes. Two adenosine residues in the loop of the CRE RNA structures allow the viral RNA-dependent RNA polymerase 3D(Pol) to add two uridine residues to the tyrosine residue of VPg. Because VPg and/or VPgpUpU(OH) prime the initiation of viral RNA replication, the asymmetric replication of viral RNA could not be explained without an understanding of the viral RNA template involved in the conversion of VPg into VPgpUpU(OH) primers. We review the growing body of knowledge regarding picornavirus CREs and discuss how CRE RNAs work coordinately with viral replication proteins and other cis-active RNAs in the 5' and 3' NTRs during RNA replication.
Steil
Benjamin P
BP
Department of Microbiology and Program in Molecular Biology, University of Colorado Denver, School of Medicine, United States.
Barton
David J
DJ
D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D000595:Amino Acid Sequence; D001483:Base Sequence; D016679:Genome, Viral; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D016366:Open Reading Frames; D010849:Picornaviridae / Q000235:genetics* / Q000502:physiology; D012367:RNA, Viral / Q000096:biosynthesis* / Q000737:chemistry*; D012324:RNA-Dependent RNA Polymerase / Q000378:metabolism; D014764:Viral Proteins / Q000378:metabolism; D014779:Virus Replication
D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D012367:RNA, Viral; D014764:Viral Proteins; D012324:RNA-Dependent RNA Polymerase
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