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Published on: June 14, 2022
SARS-CoV-2 Nsp8 N-terminal domain folds autonomously and binds dsRNA
Miguel Á Treviño1, David Pantoja-Uceda1, Douglas V Laurents1
1"Blas Cabrera" Institute for Physical Chemistry, Spanish National Research Council, Serrano 119, Madrid 28006, Spain.
Abstract:
The SARS-CoV-2 Nsp8 protein is a critical component of the RNA replicase, as its N-terminal domain (NTD) anchors Nsp12, the RNA, and Nsp13. Whereas its C-terminal domain (CTD) structure is well resolved, there is an open debate regarding the conformation adopted by the NTD as it is predicted as disordered but found in a variety of complex-dependent conformations or missing from many other structures. Using NMR spectroscopy, we show that the SARS CoV-2 Nsp8 NTD features both well folded secondary structure and disordered segments. Our results suggest that while part of this domain corresponding to two long α-helices forms autonomously, the folding of other segments would require interaction with other replicase components. When isolated, the α-helix population progressively declines towards the C-termini but surprisingly binds dsRNA while preserving structural disorder.
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