1P7E

GB3 solution structure obtained by refinement of X-ray structure with dipolar couplings

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D IPAP [15N,1H]-HSQC	25 mM NaH2PO4/Na2HPO4, 0.2 mg/mL NaN3, 1.5 mM GB3 protein and aligning media		0.05	6.5	ambient	300
2	3D CT(H)CA(CO)NH	25 mM NaH2PO4/Na2HPO4, 0.2 mg/mL NaN3, 1.5 mM GB3 protein and aligning media		0.05	6.5	ambient	300
3	13C-coupled 3D HNCO	25 mM NaH2PO4/Na2HPO4, 0.2 mg/mL NaN3, 1.5 mM GB3 protein and aligning media		0.05	6.5	ambient	300
4	quantitative J-correlation 3D TROSY-HNCO	25 mM NaH2PO4/Na2HPO4, 0.2 mg/mL NaN3, 1.5 mM GB3 protein and aligning media		0.05	6.5	ambient	300

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

NMR Refinement
Method	Details	Software
simulated annealing	GB3 solution structure obtained by refinement of the X-ray structure of GB3 (1IGD) with C(alpha)-C', C'-N and C(alpha)-H(alpha) dipolar couplings measured in five aligning media (bicelle, PEG, pf1 phage, negatively and positively charged polyacrylamide gels). HN is placed at the position that yields best agreement with the N-H dipolar couplings. Dipolar couplings originating on residues 10-11, 24-26, 39-41 and the N- and C-terminal residues were excluded, resulting in identity with the X-ray structure for these residues. Less than five N-H couplings could be obtained for residues Q2, E15, E27, N35, N37, and Y45 and for these residues as well as the excluded ones HN is placed on a line that bisects the C'(i-1)-N(i)-C(alpha,i) angle.	DYNAMO

NMR Ensemble Information
Conformer Selection Criteria	Best agreement with dipolar constraints
Conformers Calculated Total Number	20
Conformers Submitted Total Number	1
Representative Model	1 (fewest violations)

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	DYNAMO	2.1	Delaglio, F.
2	refinement	DYNAMO	2.1	Delaglio, F.