1LVZ

METARHODOPSIN II BOUND STRUCTURE OF C-TERMINAL PEPTIDE OF ALPHA-SUBUNIT OF TRANSDUCIN

SOLUTION NMR

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NMR Experiment
Experiment	Type	Sample Contents	Solvent	Ionic Strength	pH	Pressure	Temperature (K)	Spectrometer
1	2D NOESY	2.6mM S2 peptide U-15N, 0.063mM rhodopsin as part of intact disk membranes from bovine retina; buffer: 10 mM HEPES, 20mM KCl, 0.05mM DTPA	90% H2O/10% D2O	10 mM HEPES, 20 mM KCl	6.6	ambient	283
2	2D 1H-15N HSQC (w/o 1H decoupling)	2.6mM S2 peptide U-15N, 0.063mM rhodopsin as part of intact disk membranes from bovine retina; buffer: 10 mM HEPES, 20mM KCl, 0.05mM DTPA	90% H2O/10% D2O	10 mM HEPES, 20 mM KCl	6.6	ambient	283
3	2D 1H-13C CT-HSQC (w/o 1H decoupling)	2.6mM S2 peptide U-15N, 13C, 0.063mM rhodopsin as part of intact disk membranes from bovine retina; buffer: 10 mM HEPES, 20mM KCl, 0.05mM DTPA	90% H2O/10% D2O	10 mM HEPES, 20 mM KCl	6.6	ambient	283

NMR Spectrometer Information
Spectrometer	Manufacturer	Model	Field Strength
1	Bruker	DMX	750
2	Bruker	DMX	600

NMR Refinement
Method	Details	Software
simulated annealing, molecular dynamics	the structures are based on a total of 121 NOE-derived distance constraints, 12 NOE-derived dihedral angle restraints, and 38 residual dipolar couplings	NMRPipe

NMR Ensemble Information
Conformer Selection Criteria	structures with the lowest energy
Conformers Calculated Total Number	100
Conformers Submitted Total Number	20
Representative Model	1 (lowest energy structure)

Additional NMR Experimental Information

Details

sample was studied in dark adapted state and after photo activation of rhodopsin by illuminating the sample for 60s with a focussed microscope light, chemical shifts of S2 peptide are identical in both states, TrNOEs and TrDCs are difference values between the dark and light-activated states. orientation of the bound peptide relative to the membrane normal was determined from residual dipolar couplings. the membrane normal that belongs to model 1 runs parallel to the y-axis of the coordinate frame in which the deposited s2 peptide coordinates are specified.

Computation: NMR Software
#	Classification	Version	Software Name	Author
1	processing	NMRPipe	2.1	Delaglio
2	structure solution	X-PLOR	NIH	A.T. Brunger
3	refinement	X-PLOR	NIH	A.T. Brunger, N. Tjandra, C.D. Schwieters, J. Kuszewski, G.M. Clore