6SYK

Guanine-rich oligonucleotide with 5'- and 3'-GC ends form G-quadruplex with A(GGGG)A hexad, GCGC- and G-quartets and two symmetric GG and AA base pair

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1 mM GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	90% H2O/10% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies VNMRS 800 MHz NMR spectrometer 800
2	2D NOESY	1 mM GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	90% H2O/10% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies DD2 600 MHz NMR spectrometer 600
3	2D NOESY	1 mM GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	100% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies VNMRS 800 MHz NMR spectrometer 800
4	2D NOESY	1 mM GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	100% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies DD2 600 MHz NMR spectrometer 600
5	2D TOCSY	1 mM GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	100% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies DD2 600 MHz NMR spectrometer 600
6	2D DQF-COSY	1 mM GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	90% H2O/10% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies DD2 600 MHz NMR spectrometer 600
7	2D 1H-31P COSY	1 mM GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	100% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies DD2 600 MHz NMR spectrometer 600
8	2D 1H-13C HSQC aromatic	1 mM 8% 13C, 8% 15N GCnCG, 175 mM sodium chloride, 10 mM sodium phosphate buffer	90% H2O/10% D2O	175 mM	6.8	1 atm	298	Agilent Agilent Technologies DD2 600 MHz NMR spectrometer 600

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Agilent	Agilent Technologies VNMRS 800 MHz NMR spectrometer	800
2	Agilent	Agilent Technologies DD2 600 MHz NMR spectrometer	600

NMR Refinement
Method	Details	Software
simulated annealing		Amber

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

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR		Varian
2	processing	VNMR		Varian
3	chemical shift assignment	VNMR		Varian
4	peak picking	Sparky		Goddard
5	structure calculation	Amber	14	Case, Darden, Cheatham III, Simmerling, Wang, Duke, Luo, ... and Kollman
6	refinement	Amber	14	Case, Darden, Cheatham III, Simmerling, Wang, Duke, Luo, ... and Kollman

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.