1J8N

Solution structure of beta3-analogue peptide corresponding to the gp41 600-612 loop of HIV.

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	2mM peptide ; 500ul DMSO-D6	DMSO-D6			ambient	298
2	DQF-COSY	4mM peptide ; 500ul DMSO-D6	DMSO-D6			ambient	298
3	2D NOESY	4mM peptide ; 500ul DMSO-D6	DMSO-D6			ambient	298

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

NMR Refinement
Method	Details	Software
torsion angle dynamics , molecular dynamics, energy minimization	50 INITIAL RANDOM STRUCTURES WERE CALCULATED USING SIMULATED ANNEALING IN DYANA SOFTWARE. REFINEMENT WAS DONE WITH 500 STEPS RESTRAINED MINIMIZATION, 35PS MD IN VACUO AT 300K FOR EQUILIBRATION, 200PS MD UNDER NMR RESTRAINTS, AND 750PS CONJUGATED GRADIENT EM USING DISCOVER MODULE OF MSI SOFTWARE.	XwinNMR

NMR Ensemble Information
Conformer Selection Criteria	target function
Conformers Calculated Total Number	50
Conformers Submitted Total Number	27
Representative Model	1 (lowest energy)

Additional NMR Experimental Information
Details	THIS STRUCTURE WAS DETERMINED USING STANDARD 2D HOMONUCLEAR TECHNIQUES. NOESY EXPERIMENTS WITH MIXING TIMES FROM 80MS TO 800MS WERE RECORDED IN ORDER TO DEFINE THE BEST CONDITIONS IN ORDER TO AVOID SPIN DIFFUSION.

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