2KJ1

cytoplasmic domain structure of BM2 proton channel from influenza B virus

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D 1H-15N HSQC	0.8 mM [U-100% 13C; U-100% 15N] cytoplasmic domain of BM2, 150 mM [U-100% 2H] LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
2	3D 1H-15N NOESY	0.8 mM [U-100% 15N] cytoplasmic domain of BM2, 150 mM LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
3	3D 1H-13C NOESY	0.8 mM [U-100% 15N] cytoplasmic domain of BM2, 150 mM LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
4	3D HNCA	0.8 mM [U-100% 13C; U-100% 15N; U-80% 2H] cytoplasmic domain of BM2, 150 mM LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
5	3D HNCACB	0.8 mM [U-100% 13C; U-100% 15N; U-80% 2H] cytoplasmic domain of BM2, 150 mM LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
6	3D HNCO	0.8 mM [U-100% 13C; U-100% 15N; U-80% 2H] cytoplasmic domain of BM2, 150 mM LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
7	2D 1H-13C HSQC	0.8 mM [U-100% 13C; U-100% 15N; U-80% 2H] cytoplasmic domain of BM2, 150 mM LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
8	J(NCgamma-aliphatic)	0.8 mM [U-100% 15N] cytoplasmic domain of BM2, 150 mM LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
9	J-scaled TROSY-HNCO	0.5 mM [U-10% 13C] cytoplasmic domain of BM2, 150 mM potassium form of LMPG, 25 mM potassium chloride, 25 mM TRIS, 2.9 % dGpdG	93% H2O/7% D2O	25	6.8	ambient	305
10	3D (1H-13C-HMQC)-NOESY-(1H-15N-TROSY)	0.8 mM [ILV_methyl_13C; U-100% 15N; U-80% 2H] cytoplasmic domain of BM2, 150 mM [U-100% 2H] LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305
11	3D (1H-13C-HMQC)-NOESY-(1H-13C-HSQC)	0.8 mM [ILV_methyl_13C; U-100% 15N; U-80% 2H] cytoplasmic domain of BM2, 150 mM [U-100% 2H] LMPG, 25 mM sodium chloride, 25 mM TRIS	93% H2O/7% D2O	25	6.8	ambient	305

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	600
2	Bruker	AVANCE	750
3	Bruker	AVANCE	900

NMR Refinement
Method	Details	Software
simulated annealing	Structures were calculated using the program XPLOR-NIH (Schwieters et al., 2002). The secondary structure of the monomer was first calculated from random coil using intra-subunit NOEs, backbone dihedral restraints derived from chemical shifts (TALOS) (Cornilescu et al., 1999), and side chain χ1 restraints. A total of 20 monomer structures were calculated using a standard high-temperature simulated annealing (SA) protocol in which the bath temperature was cooled from 1000 to 200 K. To obtain an initial set of tetramer structures, four copies of the lowest-energy monomer structure calculated above were used. The same SA run was performed in the presence of inter-subunit NOEs and all other intra-subunit restraints. For each experimental inter-subunit NOE between two adjacent subunits, four identical distance restraints were assigned respectively to all pairs of neighboring subunits to satisfy the condition of C4 rotational symmetry. During the annealing run, the bath was cooled from 1000 to 200 K with a temperature step of 20 K. A total of 100 tetramer structures were calculated. For BM2(1-33), 15 low energy structures were selected as the structural ensemble.	X-PLOR NIH

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	15
Representative Model	1 (lowest energy)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	refinement	X-PLOR NIH		Schwieters, C.D. et al.
2	processing	NMRPipe		Delaglio, F. et al.
3	data analysis	NMRDraw		Delaglio, F. et al.
4	collection	XwinNMR		Bruker Biospin
5	chemical shift calculation	TALOS		Cornilescu, G. et al.
6	structure solution	ProcheckNMR		Laskowski, R. et al.
7	chemical shift assignment	CARA		Keller, R. et al.