1NPQ

structure of a rhodamine-labeled N-domain Troponin C mutant (Ca2+ saturated) in complex with skeletal Troponin I 115-131

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_NOESY	320 mM KCl, 10 mM imidazole, 1.3% NaN3, pH 6.5, ~1mM sNTnC.2Ca2+.TnI115-131.BR56-63	90% H2O/10% D2O	320 mM KCl	6.5	ambiant	303
2	3D_15N/13C-NOESY	320 mM KCl, 10 mM imidazole, 1.3% NaN3, pH 6.5, ~1mM sNTnC.2Ca2+.TnI115-131.BR56-63	90% H2O/10% D2O	320 mM KCl	6.5	ambiant	303
3	HNHA	320 mM KCl, 10 mM imidazole, 1.3% NaN3, pH 6.5, ~1mM sNTnC.2Ca2+.TnI115-131.BR56-63	90% H2O/10% D2O	320 mM KCl	6.5	ambiant	303
4	2D_13C/15N-edited-NOESY	320 mM KCl, 10 mM imidazole, 1.3% NaN3, pH 6.5, ~1mM sNTnC.2Ca2+.TnI115-131.BR56-63	90% H2O/10% D2O	320 mM KCl	6.5	ambiant	303
5	2D_13C/15N-filtered/edited-NOESY	320 mM KCl, 10 mM imidazole, 1.3% NaN3, pH 6.5, ~1mM sNTnC.2Ca2+.TnI115-131.BR56-63	90% H2O/10% D2O	320 mM KCl	6.5	ambiant	303

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	800
2	Varian	UNITY	600
3	Varian	INOVA	500

NMR Refinement
Method	Details	Software
simulated annealing using torsion angle dynamics AND cartesian dynamics with the program CNS 1.1	calcium restraints were introduced only during the 2nd cooling stage using cartesian dynamics. See table 3 of the reference paper for a detailed description of the distance and dihedral restraints.	CNS

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	21
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	The structure was determined using triple-resonance spectroscopy. The chemical shifts for TnI115-131 were obtained from a 2D_15N/13C_filtered-DIPSI experiment. Intramolecular NOEs for TnI115-131 were obtained from a 2D_15N/13C_filtered-NOESY experiment.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	CNS	1.1	A.T.Brunger
2	processing	NMRPipe	Feb 2002	Frank Delaglio
3	data analysis	NMRView	5.0.4	Bruce Johnson
4	data analysis	Procheck	3.5.4	Laskowski
5	refinement	CNS	1.1	A.T.Brunger

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 R01GM157729.