1KVF

EMP-18 Erythropoietin Receptor Agonist Peptide

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D-ROESY	3 mM peptide	90% H2O, 10% D2O, pH 5.1	0	5.1	ambient	303
2	2D-NOESY	3 mM peptide	90% H2O, 10% D2O, pH 5.1	0	5.1	ambient	303
3	DQF-COSY	3 mM peptide	90% H2O, 10% D2O, pH 5.1	0	5.1	ambient	303
4	COSY-35	3 mM peptide	100 % D2O pH 5.1	0	5.1	ambient	303
5	2D-NOESY	3 mM peptide	100 % D2O pH 5.1	0	5.1	ambient	303
6	2D-ROESY	3 mM peptide	100 % D2O pH 5.1	0	5.1	ambient	303

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

NMR Refinement
Method	Details	Software
distance geometry and restrained molecular dynamics	The structures are based on 52 NOE distance restraints, 11 phi and 4 chi-1 dihedral angle restraints. No hydrogen bond restraints were employed. The mean backbone atom RMSD to the mean structure within the disulfide cycle is 0.43 +/- 0.12 Angstoms.	DGII

NMR Ensemble Information
Conformer Selection Criteria	structures with the least restraint violations
Conformers Calculated Total Number	80
Conformers Submitted Total Number	20
Representative Model	1 (closest to the average)

Additional NMR Experimental Information

Details

This structure was determined using standard 2D homonuclear techniques. The sample contains a mixture of cis and trans isomers about the Gly7-Pro8 peptide bond. Both sets of resonances were assigned. The trans isoform is not well ordered in solution. The cis isoform is structured, especially within the disulfide cycle. Structures were calculated on the basis of restraints generated only from the cis isoform.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	structure solution	DGII	98.0	Timothy Havel
2	refinement	Discover	3.1	Accelrys