2KLW

Solution structure of an abc collagen heterotrimer reveals a single-register helix stabilized by electrostatic interactions

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-1H TOCSY	1.2 mM K-1, 1.2 mM D-2, 1.2 mM O-3	90% H2O/10% D2O		7	ambient	298
2	2D 1H-1H NOESY	1.2 mM K-1, 1.2 mM D-2, 1.2 mM O-3	90% H2O/10% D2O		7	ambient	298
3	2D 1H-1H TOCSY	1.2 mM K-4	90% H2O/10% D2O		7	ambient	298
4	2D 1H-1H TOCSY	1.2 mM D-5	90% H2O/10% D2O		7	ambient	298
5	2D 1H-1H TOCSY	1.2 mM O-6	90% H2O/10% D2O		7	ambient	298
6	2D 1H-1H NOESY	1.2 mM O-6	90% H2O/10% D2O		7	ambient	298
7	2D 1H-13C HSQC	1.2 mM [U-99% 13C; U-99% 15N] K-7, 1.2 mM [U-99% 13C; U-99% 15N] D-8, 1.2 mM [U-99% 13C; U-99% 15N] O-9	90% H2O/10% D2O		7	ambient	298
8	2D 1H-15N HSQC	1.2 mM [U-99% 13C; U-99% 15N] K-7, 1.2 mM [U-99% 13C; U-99% 15N] D-8, 1.2 mM [U-99% 13C; U-99% 15N] O-9	90% H2O/10% D2O		7	ambient	298
9	3D HNHA	1.2 mM [U-99% 13C; U-99% 15N] K-7, 1.2 mM [U-99% 13C; U-99% 15N] D-8, 1.2 mM [U-99% 13C; U-99% 15N] O-9	90% H2O/10% D2O		7	ambient	298
10	2D 1H-1H 13C-HMQC NOESY 15N-HSQC	1.2 mM [U-99% 13C; U-99% 15N] K-7, 1.2 mM [U-99% 13C; U-99% 15N] D-8, 1.2 mM [U-99% 13C; U-99% 15N] O-9	90% H2O/10% D2O		7	ambient	298
11	2D 1H-1H NOESY	1.2 mM K-1, 1.2 mM D-2, 1.2 mM O-3	90% H2O/10% D2O		7	ambient	283
12	2D 1H-1H TOCSY	1.2 mM K-1, 1.2 mM D-2, 1.2 mM O-3	90% H2O/10% D2O		7	ambient	283
13	2D 1H-15N HSQC	1.8 mM K-10, 1.2 mM D-11, 1.2 mM O-12	90% H2O/10% D2O		7	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	800

NMR Refinement
Method	Details	Software
simulated annealing, constraint minimization	simulated annealing in CNS using a combination of torsional and cartesian dynamics, refinement in implicit solvent using amber	CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	300
Conformers Submitted Total Number	15
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CNS	v 1.21	Brunger, Adams, Clore, Gros, Nilges and Read
2	chemical shift assignment	Sparky		Goddard
3	refinement	Amber	9	Case, Darden, Cheatham, III, Simmerling, Wang, Duke, Luo, ... and Kollm
4	data analysis	CcpNMR		CCPN
5	processing	NMRPipe		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax

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.