2KQO

A 3D-structural model of unsulphated chondroitin from high-field NMR: 4-sulphation has little effect on backbone conformation

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	5-10 mM [U-15N] unsulphated chondroitin	90% H2O/10% D2O		6.0	ambient	298
2	2D 1H-13C HSQC	5-10 mM [U-15N] unsulphated chondroitin	90% H2O/10% D2O		6.0	ambient	298
3	2D 1H-1H TOCSY	5-10 mM [U-15N] unsulphated chondroitin	90% H2O/10% D2O		6.0	ambient	298
4	2D 1H-1H COSY	5-10 mM [U-15N] unsulphated chondroitin	90% H2O/10% D2O		6.0	ambient	298
5	2D 1H-1H NOESY	5-10 mM [U-15N] unsulphated chondroitin	90% H2O/10% D2O		6.0	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600
2	Varian	INOVA	900

NMR Refinement
Method	Details	Software
simulated annealing	750 nanoseconds explicit solvent (TIP3P) molecular dynamics simulated annealing within the NPT ensemble	Amber

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	250
Conformers Submitted Total Number	25
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	Amber	10	Case, D. et al.

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.