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

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	1H-JR[15N]	150 uM [U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	283	Bruker Bruker Avance III HD 700 MHz 700
2	NOESY[15N]-Imino	150 uM [U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	283	Bruker Bruker Avance III HD 800 MHz 800
3	HSQC[15N]-Amino	150 uM [U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	283	Bruker Bruker Avance III HD 700 MHz 700
4	HSQC[15N]-2J	150 uM [U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	283	Bruker Bruker Avance III HD 700 MHz 700
5	TROSY[15N]	150 uM [U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	283	Bruker Bruker Avance III HD 700 MHz 700
16	NOESY-JR[15N]-Amino	150 uM [U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	283	Bruker Bruker Avance III HD 700 MHz 700
15	TOCSY	150 uM [U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	283	Bruker Bruker Avance III HD 700 MHz 700
14	HSQC[13C]-Aromaten	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 700 MHz 700
13	1H-JR[15N]	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 700 MHz 700
12	NOESY[15N]-Imino	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 700 MHz 700
11	HSQC[15N]-Amino	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 800 MHz 800
10	HSQC[15N]-2J	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 700 MHz 700
9	TROSY[15N]	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 700 MHz 700
8	NOESY-JR[15N]-Amino	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 800 MHz 800
7	TOCSY	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance I 600 MHz 600
6	HSQC[13C]-Aromaten	400 uM [U-13C; U-15N] 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance III HD 700 MHz 700
17	HSQC[13C]-Aromaten	400 uM A,C-13C, U-15N 5_SL1 15N, 25 mM potassium phosphate, 50 mM KCl	93% H2O/7% D2O	75 mM	6.2	1 atm	298	Bruker Bruker Avance I 600 MHz 600

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	Bruker Avance III HD 800 MHz	800
2	Bruker	Bruker Avance III HD 700 MHz	700
3	Bruker	Bruker Avance I 600 MHz	600

NMR Refinement
Method	Details	Software
simulated annealing		ARIA

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	200
Conformers Submitted Total Number	10
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	chemical shift assignment	TopSpin		Bruker Biospin
2	structure calculation	CNS		Brunger, Adams, Clore, Gros, Nilges and Read
3	refinement	ARIA		Linge, O'Donoghue and Nilges
4	peak picking	NMRFAM-SPARKY		Wonghee Lee

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.