2MKP

N domain of cardiac troponin C bound to the switch fragment of fast skeletal troponin I at pH 6

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
2	2D 1H-13C HSQC	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
3	3D CBCA(CO)NH	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
4	3D C(CO)NH	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
5	3D HNCACB	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
6	3D H(CCO)NH	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
7	3D 1H-15N NOESY	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
8	3D 1H-13C NOESY aliphatic	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
9	2D 1H-1H NOESY	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303
10	2D 1H-1H TOCSY	0.2-0.3 mM [U-95% 13C; U-95% 15N] cNTnC, 2-2.5 mM sTnI(115-131), 0.25 mM DSS, 100 mM potassium chloride, 10 mM imidazole, 10 mM Calcium	95% H2O/5% D2O	0.12	6.00	ambient	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	UNITY	600
2	Varian	INOVA	500

NMR Refinement
Method	Details	Software
simulated annealing	semi-rigid simulated annealing. sTnI was docked onto cNTnC. cNTnC backbone was kept rigid and side chain's were allowed to rotate.	VnmrJ

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	50
Conformers Submitted Total Number	10
Representative Model	1 (fewest violations)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VnmrJ		Varian
2	refinement	PSVS		Bhattacharya and Montelione
3	data analysis	PSVS		Bhattacharya and Montelione
4	data analysis	NMRDraw		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
5	processing	NMRDraw		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
6	processing	NMRPipe		Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax
7	chemical shift assignment	NMRView		Johnson, One Moon Scientific
8	peak picking	NMRView		Johnson, One Moon Scientific
9	data analysis	NMRView		Johnson, One Moon Scientific
10	geometry optimization	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore
11	refinement	X-PLOR NIH		Schwieters, Kuszewski, Tjandra and Clore

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.