CONFORMATIONAL MAPPING OF THE N-TERMINAL FUSION PEPTIDE OF HIV-1 GP41 USING 13C-ENHANCED FOURIER TRANSFORM INFRARED SPECTROSCOPY (FTIR)
INFRARED SPECTROSCOPY
| NMR Experiment | ||||||||
|---|---|---|---|---|---|---|---|---|
| Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
| 1 | 13-C isotope enhanced FTIR | THIS STRUCTURE WAS DETERMINED USING 13-C ISOTOPE ENHANCED FTIR SPECTROSCOPY ON A FAMILY OF SELECTIVELY LABELED CHEMICALLY SYNTHESIZED PEPTIDES. 13-C CARBONYL LABELS INCLUDED RESIDUES 519,521,523,524,525,526,527,528,529,530,531,532,533,534,538,539. | 70% hexafluoroisopropanol (HFIP), 29.9% water, 0.1% formic acid (v/v) | 0 | 7.0 | 1 atm | 298 | |
| NMR Spectrometer Information | |||
|---|---|---|---|
| Spectrometer | Manufacturer | Model | Field Strength |
| 1 | Mattson FTIR | Research Series | |
| NMR Refinement | ||
|---|---|---|
| Method | Details | Software |
| molecular dynamics, simulated annealing | Molecular dynamics (simulated annealing) was used to generate an ensemble of conformers consistent with the FTIR data. | Winfirst |
| NMR Ensemble Information | |
|---|---|
| Conformer Selection Criteria | structures with acceptable covalent geometry |
| Conformers Calculated Total Number | 31 |
| Conformers Submitted Total Number | 17 |
| Representative Model | 9 (closest to the average) |
| Additional NMR Experimental Information | |
|---|---|
| Details | The coordinates in this entry were generated from 13-C induced spectral shifts which give residue-specific secondary structure information. |
| Computation: NMR Software | ||||
|---|---|---|---|---|
| # | Classification | Version | Software Name | Author |
| 1 | data analysis | Winfirst | FTIR curve fitting software | Kauppine et al. |
| 2 | refinement | Discover | 2.9.7 | Molecular Simulations, Inc. (San Diego, CA) |
