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Highly conserved s2m element of SARS-CoV-2 dimerizes via a kissing complex and interacts with host miRNA-1307-3p #MMPMID34908151
Nucleic Acids Res 2022[Jan]; 50 (2): 1017-1032 PMID34908151show ga
The ongoing COVID-19 pandemic highlights the necessity for a more fundamental understanding of the coronavirus life cycle. The causative agent of the disease, SARS-CoV-2, is being studied extensively from a structural standpoint in order to gain insight into key molecular mechanisms required for its survival. Contained within the untranslated regions of the SARS-CoV-2 genome are various conserved stem-loop elements that are believed to function in RNA replication, viral protein translation, and discontinuous transcription. While the majority of these regions are variable in sequence, a 41-nucleotide s2m element within the genome 3' untranslated region is highly conserved among coronaviruses and three other viral families. In this study, we demonstrate that the SARS-CoV-2 s2m element dimerizes by forming an intermediate homodimeric kissing complex structure that is subsequently converted to a thermodynamically stable duplex conformation. This process is aided by the viral nucleocapsid protein, potentially indicating a role in mediating genome dimerization. Furthermore, we demonstrate that the s2m element interacts with multiple copies of host cellular microRNA (miRNA) 1307-3p. Taken together, our results highlight the potential significance of the dimer structures formed by the s2m element in key biological processes and implicate the motif as a possible therapeutic drug target for COVID-19 and other coronavirus-related diseases.
|3' Untranslated Regions/*genetics[MESH]
|Base Sequence[MESH]
|Binding Sites/genetics[MESH]
|COVID-19/*genetics/metabolism/virology[MESH]
|Conserved Sequence/genetics[MESH]
|Dimerization[MESH]
|Genome, Viral/genetics[MESH]
|Host-Pathogen Interactions/genetics[MESH]
|Humans[MESH]
|MicroRNAs/*genetics/metabolism[MESH]
|Nucleic Acid Conformation[MESH]
|Nucleotide Motifs/*genetics[MESH]
|Proton Magnetic Resonance Spectroscopy/methods[MESH]