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