Structural lability in stem-loop 1 drives a 5' UTR-3' UTR interaction in coronavirus replication.
The leader RNA of the 5' untranslated region (UTR) of coronaviral genomes contains two stem-loop structures denoted SL1 and SL2. Herein, we show that SL1 is functionally and structurally bipartite. While the upper region of SL1 is required to be paired, we observe strong genetic selection against viruses that contain a deletion of A35, an extrahelical nucleotide that destabilizes SL1, in favor of genomes that contain a diverse panel of destabilizing second-site mutations, due to introduction of a noncanonical base pair near A35. Viruses containing destabilizing SL1-DeltaA35 mutations also contain one of two specific mutations in the 3' UTR. Thermal denaturation and imino proton solvent exchange experiments reveal that the lower half of SL1 is unstable and that second-site SL1-DeltaA35 substitutions are characterized by one or more features of the wild-type SL1. We propose a "dynamic SL1" model, in which the base of SL1 has an optimized lability required to mediate a physical interaction between the 5' UTR and the 3' UTR that stimulates subgenomic RNA synthesis. Although not conserved at the nucleotide sequence level, these general structural characteristics of SL1 appear to be conserved in other coronaviral genomes.
Li
Lichun
L
Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128, USA.
Kang
Hyojeung
H
Liu
Pinghua
P
Makkinje
Nick
N
Williamson
Shawn T
ST
Leibowitz
Julian L
JL
Giedroc
David P
DP
D020413:3' Untranslated Regions / Q000235:genetics / Q000378:metabolism*; D020121:5' Untranslated Regions / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D020029:Base Pairing; D002460:Cell Line; D006224:Cricetinae; D051379:Mice; D008969:Molecular Sequence Data; D006517:Murine hepatitis virus / Q000235:genetics / Q000502:physiology*; D009154:Mutation; D009690:Nucleic Acid Conformation; D012367:RNA, Viral / Q000235:genetics / Q000378:metabolism*; D014779:Virus Replication
D020413:3' Untranslated Regions; D020121:5' Untranslated Regions; D012367:RNA, Viral