9EOW
The 5-terminal stem-loop RNA element of SARS-CoV-2 features highly dynamic structural elements that are sensitive to differences in cellular pH
Summary for 9EOW
| Entry DOI | 10.2210/pdb9eow/pdb |
| NMR Information | BMRB: 34909 |
| Descriptor | RNA (29-MER) (1 entity in total) |
| Functional Keywords | solution structure, conformational dynamics, pka shift, adenosine protonation, rna |
| Biological source | Severe acute respiratory syndrome coronavirus 2 |
| Total number of polymer chains | 1 |
| Total formula weight | 9204.52 |
| Authors | Wacker, A.,Schwalbe, H. (deposition date: 2024-03-15, release date: 2024-06-19, Last modification date: 2024-07-31) |
| Primary citation | Toews, S.,Wacker, A.,Faison, E.M.,Duchardt-Ferner, E.,Richter, C.,Mathieu, D.,Bottaro, S.,Zhang, Q.,Schwalbe, H. The 5'-terminal stem-loop RNA element of SARS-CoV-2 features highly dynamic structural elements that are sensitive to differences in cellular pH. Nucleic Acids Res., 52:7971-7986, 2024 Cited by PubMed Abstract: We present the nuclear magnetic resonance spectroscopy (NMR) solution structure of the 5'-terminal stem loop 5_SL1 (SL1) of the SARS-CoV-2 genome. SL1 contains two A-form helical elements and two regions with non-canonical structure, namely an apical pyrimidine-rich loop and an asymmetric internal loop with one and two nucleotides at the 5'- and 3'-terminal part of the sequence, respectively. The conformational ensemble representing the averaged solution structure of SL1 was validated using NMR residual dipolar coupling (RDC) and small-angle X-ray scattering (SAXS) data. We show that the internal loop is the major binding site for fragments of low molecular weight. This internal loop of SL1 can be stabilized by an A12-C28 interaction that promotes the transient formation of an A+•C base pair. As a consequence, the pKa of the internal loop adenosine A12 is shifted to 5.8, compared to a pKa of 3.63 of free adenosine. Furthermore, applying a recently developed pH-differential mutational profiling (PD-MaP) approach, we not only recapitulated our NMR findings of SL1 but also unveiled multiple sites potentially sensitive to pH across the 5'-UTR of SARS-CoV-2. PubMed: 38842942DOI: 10.1093/nar/gkae477 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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