Experiment: 1MPE

Ensemble of 20 structures of the tetrameric mutant of the B1 domain of streptococcal protein G

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_NOESY	2.89 mM (in monomer) U-15N, 50 mM sodium phosphate buffer, 0.02% sodium azide	90% H2O/10% D2O	50 mM sodium phosphate, 0.02% sodium azide	5.45	1 atm	313
2	HNHA	2.89 mM (in monomer) U-15N, 50 mM sodium phosphate buffer, 0.02% sodium azide	90% H2O/10% D2O	50 mM sodium phosphate, 0.02% sodium azide	5.45	1 atm	313
3	3D_13C-separated_NOESY	3.5 mM (in monomer) U-15N,13C, 50 mM sodium phosphate buffer, 0.02% sodium azide	90% H2O/10% D2O	50 mM sodium phosphate, 0.02% sodium azide	5.45	1 atm	313
4	4D_13C-separated_NOESY	3.5 mM (in monomer) U-15N,13C, 50 mM sodium phosphate buffer, 0.02% sodium azide	100% D2O	50 mM sodium phosphate, 0.02% sodium azide	5.45	1 atm	313
5	4D_13C/15N-separated_NOESY	3.5 mM (in monomer) U-15N,13C, 50 mM sodium phosphate buffer, 0.02% sodium azide	90% H2O/10% D2O	50 mM sodium phosphate, 0.02% sodium azide	5.45	1 atm	313
6	3D_12C-filtered_13C-separated_NOESY	1.4 mM (in monomer) 1:1 mixture unlabelled:U-15N,13C, 50 mM sodium phosphate buffer, 0.02% sodium azide	100% D2O	50 mM sodium phosphate, 0.02% sodium azide	5.45	1 atm	313

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DRX	800
2	Bruker	DMX	750
3	Bruker	DMX	600
4	Bruker	DMX	500

NMR Refinement
Method	Details	Software
simulated annealing	NMR constraints (per monomer) 822 NOE-derived distance restraints (534 intramonomer, 288 intermonomer) 42 distance restraints from hydrogen bonds (20 intramonomer, 22 intermonomer) 30 J-coupling restraints, 33 Residual dipolar couplings (HN) 66 backbone dihedral angle restraints 31 sidechain dihedral angle restraints	NMRPipe

NMR Ensemble Information
Conformer Selection Criteria	structures with least restraint violations and phi, psi angles of residue 46 in allowed region of Ramachrandran plot
Conformers Calculated Total Number	100
Conformers Submitted Total Number	21
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	T1,T2, and heteronuclear NOEs collected. Dipolar couplings (N-H) were collected as well. Dipolar coupling and chemical shifts from residues with heteronuclear NOE below 0.6 were not used.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	NMRPipe	2.2	Frank Delaglio
2	data analysis	PIPP	4.3.2	Dan Garrett
3	collection	XwinNMR	2.6	Bruker Corp.
4	refinement	X-PLOR	4.0	Brunger
5	structure solution	CNS	1.0	Brunger