Warden MS, Cai K, Cornilescu G, Burke JE, Ponniah K, Butcher SE, Pascal SM. Conformational flexibility in the enterovirus RNA replication platform.
RNA (NEW YORK, N.Y.) 2019;
25:376-387. [PMID:
30578285 PMCID:
PMC6380274 DOI:
10.1261/rna.069476.118]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 12/19/2018] [Indexed: 05/06/2023]
Abstract
A presumed RNA cloverleaf (5'CL), located at the 5'-most end of the noncoding region of the enterovirus genome, is the primary established site for initiation of genomic replication. Stem-loop B (SLB) and stem-loop D (SLD), the two largest stem-loops within the 5'CL, serve as recognition sites for protein interactions that are essential for replication. Here we present the solution structure of rhinovirus serotype 14 5'CL using a combination of nuclear magnetic resonance spectroscopy and small-angle X-ray scattering. In the absence of magnesium, the structure adopts an open, somewhat extended conformation. In the presence of magnesium, the structure compacts, bringing SLB and SLD into close contact, a geometry that creates an extensive accessible major groove surface, and permits interaction between the proteins that target each stem-loop.
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