1JY4

B4DIMER: A DE NOVO DESIGNED EIGHT-STRANDED BETA-SHEET ASSEMBLED USING A DISULFIDE BOND

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	1mM B4dimer	CD3OH	unbuffered		ambient	300
2	DQF-COSY	1mM B4dimer	CD3OH	unbuffered		ambient	300
3	TOCSY	1mM B4dimer	CD3OH	unbuffered		ambient	300

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DRX	500

NMR Refinement
Method	Details	Software
torsion angle dynamics/ simulated annealing	The ten structures were determined by NMR and torsion angle dynamics/simulated annealing methods. The peptide dimer was treated as a single entity and symmetry elements were not utilized during structure calculations. The structures are based on a total of 446 restraints, 398 are NOE-derived distance constraints,48 distance restraints are from hydrogen bonds. The list of constraints is available in the file dyana_upperconst.txt. Structure calculations were performed with the program DYANA-1.5 (P. Guentert, C. Mumenthaler, K. Wuthrich, J. Mol. Biol.(1997)Vol.273, 283-298). No violation of distance constraints from NOEs exceeded 0.3Angstroms. The ensemble of structures is superimposed over the best-structured region encompasing residues E11-L34. The average RMSDs between the superposed structures and the average structure are as follows: 0.75(chain A, residues 11-34, backbone atoms) 0.72(chain B, residues 11-34, backbone atoms.	DYANA

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations,structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	10
Representative Model	8 (closest to the average)

Additional NMR Experimental Information
Details	This structure was determined using standard 2D homonuclear techniques.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	DYANA	1.5	Guentert
2	refinement	DYANA	1.5	Guentert