1OSX

Solution Structure of the Extracellular Domain of BLyS Receptor 3 (BR3)

SOLUTION NMR

NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_15N-separated_NOESY	1.5 mM BR3 U-15N,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	92%H2O/8%D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
2	3D_13C-separated_NOESY	1.5 mM BR3 U-15N,13C,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	92%H2O/8%D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
3	HNHA	1.5 mM BR3 U-15N,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	92%H2O/8%D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
4	HNHB	1.5 mM BR3 U-15N,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	92%H2O/8%D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
5	3D HCCH-COSY	1.5 mM BR3 U-15N,13C,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	100% D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
6	3D HCCH-TOCSY	1.5 mM BR3 U-15N,13C,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	100% D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
7	3D HNCO	1.5 mM BR3 U-15N,13C,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	92%H2O/8%D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
8	3D HNCA	1.5 mM BR3 U-15N,13C,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	92%H2O/8%D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293
9	3D CBCA(CO)NH	1.5 mM BR3 U-15N,13C,25 mM Na2PO4, 50 mM NaCl, 0.1 mM NaN3, 0.1 mM DSS-d10	92%H2O/8%D2O	50 mM NaCl, 25 mM Na2PO4	5.0	ambient	293

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DRX	600
2	Bruker	DRX	800

NMR Refinement
Method	Details	Software
torsion angle dynamics simulated annealing	Only 19 residues, including Cys19 through Leu37 are ordered in solution, while the rest of the extracellular domain is highly flexible (based on 1H-15N heteronuclear NOE analysis). Furthermore, the BAFF-binding domain of BR3 was found to reside within a fragment consisting of Thr17-Arg42 denoted miniBR3. Thus, the structure of BR3 was calculated only for these 26 residues, based on a total of 315 distance and 46 dihedral angle restraints derived from analysis of NMR data colleected on the entire BR3 ECD.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest restraint violation energy
Conformers Calculated Total Number	128
Conformers Submitted Total Number	20
Representative Model	1 (lowest restraint violation energy)

Additional NMR Experimental Information
Details	The structure was determined using triple-resonance NMR spectroscopy.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	3.6	Bruker
2	data analysis	Felix	98	Accelrys
3	structure solution	X-PLOR	98	Accelrys
4	refinement	X-PLOR	98	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.