1J9V

Solution structure of a lactam analogue (DabD) of HIV gp41 600-612 loop.

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	DQF-COSY	3,5 mM peptide in 500ul DMSO-D6	DMSO-D6			ambient	298
2	2D NOESY	3,5 mM peptide in 500ul DMSO-D6	DMSO-D6			ambient	298
3	TOCSY

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	AVANCE	400
2	Bruker	AVANCE	600

NMR Refinement
Method	Details	Software
Torsion angle dinamics, molecular dynamics, energy minimization.	50 INITIAL RANDOM STRUCTURES WERE GENERATED USING SIMULATED ANNEALING IN DYANA SOFTWARE, FOLLOWED BY 500PS RESTRAINED MINIMIZATION, 35PS MD IN VACUO AT 300K, 200 PS MD UNDER NMR RESTRAINTS AND 750 STEPS CONJUGATED GRADIENT EM USING DISCOVER OF MSI SOFTWARE	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	50
Conformers Submitted Total Number	49
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	This structure was determined using standard 2D homonuclear techniques. Different NOESY experiments with mixing times from 80 ms to 800 ms were recorded, in order to determined the best conditions avoiding spin diffusion.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	collection	XwinNMR	2.6	Bruker GMBH
2	processing	XwinNMR	2.6	Bruker GMBH
3	data analysis	XEASY	1.2	Bartels C., Xia T., Billeter M., Guentert P. and Wuethrich K. (1995) J. Biomol. NMR, 5, 1-10
4	refinement	DYANA	1.5	Guentert P., Mumenthaler C. and Wuethrich K. (1997) J. Mol. Biol. 273, 283-298
5	refinement	Discover	3	Molecular Simulation Inc. San Diego