SOLUTION NMR Experimental Data


Experimental Details
Sample Conditions
Sample Contents2 mM calcyclin, 50 MM TRIS buffer, 30 mM CaCl2
Solvent90% H2O, 10% D2O
Ionic Strength30 mM CaCl2
pH7.0
Pressureambient
Temperature (K)300
Experiment(s):2D NOESY
Sample Contents2 mM 15N, 13C-enriched calcyclin, 50 mM TRIS-buffer, 0.05% NaN3, 30 mM CaCl2
Solvent90% H2O, 10% D2O
Ionic Strength30 mM CaCl2
pH7.0
Pressureambient
Temperature (K)300
Experiment(s):3D_13C-separated_NOESY, 3D_15N-separated_NOESY, 3D_HACAHB
Sample Contents1:1 15N,13C-enriched:unlabled calcyclin, 50 mM TRIS-buffer, 0.05% NaN3, 30 mM CaCl2
Solvent90% H2O, 10% D2O
Ionic Strength30 mM CaCl2
pH7.0
Pressureambient
Temperature (K)300
Experiment(s):3D_13C-filter,13C-edited_NOESY
Sample Contents15N-enriched calcyclin, 50 mM TRIS-buffer, 0.05% NaN3, 30 mM CaCl2
Solvent90% H2O, 10% D2O
Ionic Strength30 mM CaCl2
pH7.0
Pressureambient
Temperature (K)300
Experiment(s):3D_15N-separated_NOESY
Sample Contents10% 13C-enriched calcyclin, 50 mM TRIS-buffer, 0.05% NaN3, 30 mM CaCl2
SolventD2O
Ionic Strength30 mM CaCl2
pH7.0
Pressureambient
Temperature (K)300
Experiment(s):2D_13C_HSQC
Spectrometer Information
Manufacturer Model Field Strength
Bruker AMX 500.0
Bruker DRX 600.0
Bruker DMX 750.0
NMR Refinement
Method distance geometry, restrained molecular dynamics
Details The calculations were carried out using a total of 3104 distance and 294 torsion angle constraints. Starting structures were generated as monomers (one chain) with no intersubunit constraints using distance geometry followed by restrained molecular dynamics (rMD). The dimer structures were generated by rMD docking driven by the intersubunit NOEs using two arbitrarily selected starting subunit structures. Each dimer was further refined by rMD with all constraints.
NMR Ensemble Information
Conformer Selection Criteria The program Findfam was used to establish that the number of structures required to accurately represent the ensemble was less than 22 (the number selected to represent previous S100A6 ensembles). Structures were ordered by lowest restraint violations, then accepted if total molecular energy and each contributing term was within two standard deviations of the mean. The 22 structures with least restraint violations (energy penalty and magnitude of largest violation) all met these criteria.
Conformers Calculated Total Number 100
Conformers Submitted Total Number 22
Representative Model Choice Rationale
1 closest to the average
Additional NMR Experimental Information
1 Dimer constraints were obtained from the 3D_13C-filter,13C-edited experiment in combination with 3D_13C-separated_NOESY
Computation: NMR Software
# Classification Software Name Author
1 data analysis Findfam 1.0 Smith, Chazin & Case
2 refinement AMBER 4.1 Pearlmann, Case, Caldwell, Ross, Cheatham III, Ferguson, Seibel, Singh, Weiner & Kollman
3 structure solution DIANA 2.8 Guntert, Braun & Wuthrich
4 data analysis FELIX 97 MSI