1KCY

NMR solution structure of apo calbindin D9k (F36G + P43M mutant)

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D_COSY	2.5 mM calbindin; 95% H2O; 5% D2O	95% H20; 5% D2O	no added salts	6.0	ambient	300
2	2D_NOESY	2.5 mM calbindin; 95% H2O; 5% D2O	95% H20; 5% D2O	no added salts	6.0	ambient	300
3	2D_TOCSY	2.5 mM calbindin; 95% H2O; 5% D2O	95% H20; 5% D2O	no added salts	6.0	ambient	300
4	2D_NOESY	2.5 mM calbindin D9k; 100% D20	100% D2O	no added salts	6.0	ambient	300
5	2D_15N-1H_HSQC	2.5 mM calbindin D9k U-15N; 95% H2O; 5% D2O	95% H2O/5% D2O	no added salts	6.0	ambient	300
6	3D_15N-separated_TOCSY	2.5 mM calbindin D9k U-15N; 95% H2O; 5% D2O	95% H2O/5% D2O	no added salts	6.0	ambient	300
7	3D_15N-separated_NOESY	2.5 mM calbindin D9k U-15N; 95% H2O; 5% D2O	95% H2O/5% D2O	no added salts	6.0	ambient	300
8	HNHA	2.5 mM calbindin D9k U-15N; 95% H2O; 5% D2O	95% H2O/5% D2O	no added salts	6.0	ambient	300
9	HNHB	2.5 mM calbindin D9k U-15N; 95% H2O; 5% D2O	95% H2O/5% D2O	no added salts	6.0	ambient	300

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AMX	500
2	Bruker	DMX	750

NMR Refinement
Method	Details	Software
distance geometry, simulated annealing	The structures are based on 1042 NOE restraints (186 intraresidue, 269 sequential, 289 medium range (2-4 residues apart), 298 long range), 18 hydrogen bond restraints (assigned as described in Skelton et al., 1995), and 115 dihedral constraints (45 phi, 42 psi, and 28 chi1).	DIANA

NMR Ensemble Information
Conformer Selection Criteria	The full ensemble was ordered by lowest residual constraint violations, then the top 22 with favorable covalent geometries and AMBER energies were selected
Conformers Calculated Total Number	50
Conformers Submitted Total Number	22
Representative Model	1 (closest to the average)

Additional NMR Experimental Information
Details	This structure was determined using a combination of standard 2D homonuclear and 15N-based 3D methods.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	DIANA	2.8	Guntert
2	structure solution	Amber	4.1	Pearlmann
3	data analysis	Felix	97	Molecular Simulations, Inc.
4	data analysis	GLOMSA	unknown	Guntert
5	data analysis	GENXPK	1	Gippert
6	refinement	Amber	4.1	Pearlmann

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.