1MX8

Two homologous rat cellular retinol-binding proteins differ in local structure and flexibility

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	3D_13C-separated_NOESY	1.0mM cellular retinol-binding protein I U-[99% 15N, 99% 13C] in complex with all-trans retinol (natural isotope abundance); 20mM phosphate buffer, 50mM potassium chloride, 0.05% sudium azide, 5mM beta-mecaptoethanol-d6; 95% H2O, 5% D2O	95% H2O/5% D2O	0.34	7.4	ambient	298
2	3D_15N-separated_NOESY	1.0mM cellular retinol-binding protein I U-[99% 15N, 99% 13C] in complex with all-trans retinol (natural isotope abundance); 20mM phosphate buffer, 50mM potassium chloride, 0.05% sudium azide, 5mM beta-mecaptoethanol-d6; 95% H2O, 5% D2O	95% H2O/5% D2O	0.34	7.4	ambient	298

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Varian	INOVA	500
2	Varian	INOVA	600
3	Varian	UNITYPLUS	500
4	Varian	UNITY	600

NMR Refinement
Method	Details	Software
distance geometry simulated annealing		VNMR

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	50
Conformers Submitted Total Number	25
Representative Model	1 (minimized average structure)

Additional NMR Experimental Information
Details	Triple resonance experiments for the 1H, 15N and 13C resonance assignments included the following: HNCO CBCACONNH HNCACB CBCACOCAHA HCCH-TOCSY 15N-resolved TOCSY-HSQC; The intra-ligand NOE constraints as well as ligand-protein NOE constraints were obtained from 2D 13C and 15N double half-filtered experiment

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	VNMR	6.1	varian associates
2	processing	VNMR	6.1	varian associates
3	data analysis	Felix	2000	molecular simulation inc.
4	structure solution	Tinker	3.3	Ponder, J.W.
5	refinement	Tinker	3.3	Ponder, J.W.