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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.