Crystal structure of a highly conserved enteroviral 5' cloverleaf RNA replication element.
Crystal structure of a highly conserved enteroviral 5' cloverleaf RNA replication element.
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DOI:
10.1038/s41467-023-37658-8
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发表时间:
2023-04-07
影响因子:
16.6
通讯作者:
Koirala, Deepak
中科院分区:
文献类型:
--
作者:
Das, Naba K.;Hollmann, Nele M.;Vogt, Jeff;Sevdalis, Spiridon E.;Banna, Hasan A.;Ojha, Manju;Koirala, Deepak
The extreme 5′-end of the enterovirus RNA genome contains a conserved cloverleaf-like domain that recruits 3CD and PCBP proteins required for initiating genome replication. Here, we report the crystal structure at 1.9 Å resolution of this domain from the CVB3 genome in complex with an antibody chaperone. The RNA folds into an antiparallel H-type four-way junction comprising four subdomains with co-axially stacked sA-sD and sB-sC helices. Long-range interactions between a conserved A40 in the sC-loop and Py-Py helix within the sD subdomain organize near-parallel orientations of the sA-sB and sC-sD helices. Our NMR studies confirm that these long-range interactions occur in solution and without the chaperone. The phylogenetic analyses indicate that our crystal structure represents a conserved architecture of enteroviral cloverleaf-like domains, including the A40 and Py-Py interactions. The protein binding studies further suggest that the H-shape architecture provides a ready-made platform to recruit 3CD and PCBP2 for viral replication. A cloverleaf-like RNA domain within the enterovirus genome is essential for replication. Here, the authors determine the 1.9 Å resolution crystal structure of such RNA from coxsackievirus B3 – a model enterovirus to study many other human viruses.
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