1QP6
SOLUTION STRUCTURE OF ALPHA2D
SOLUTION NMR
NMR Experiment | ||||||||
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Experiment | Type | Sample Contents | Solvent | Ionic Strength | pH | Pressure | Temperature (K) | Spectrometer |
1 | 2D NOESY | 2 MM ALPHA2D TRIS, PH 7.3, 25 C | 52 mM | 7.3 | AMBIENT | 298.0 | ||
2 | DQF-COSY | 2 MM ALPHA2D TRIS, PH 7.3, 25 C | 52 mM | 7.3 | AMBIENT | 298.0 | ||
3 | E-COSY | 2 MM ALPHA2D TRIS, PH 7.3, 25 C | 52 mM | 7.3 | AMBIENT | 298.0 |
NMR Spectrometer Information | |||
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Spectrometer | Manufacturer | Model | Field Strength |
1 | Bruker | AMX | 600 |
NMR Refinement | ||
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Method | Details | Software |
SIMULATED ANNEALING FOR 48 PS AT 2000K FOLLOWED BY A SLOW COOL TO 50K | STRUCTURE BASED ON 834 RESTRAINTS: 140 LONG-RANGE RESTRAINTS, 30 PHI ANGLE RESTRAINTS, AND 14 CHI-1 ANGLE RESTRAINTS. 83 OF THE LONG-RANGE NOES (59%) WERE DETERMINED TO ARISE FROM INTER-MONOMER CORRELATIONS BY COMPUTATIONAL METHODS. THE OTHER NOES WERE TREATED USING A WEIGHTING FUNCTION DEVELOPED FOR SYMMMETRIC HOMODIMERS THAT ALLOWS EACH NOE TO ARISE FROM EITHER AN INTRA- OR INTER- MONOMER CORRELATIONS AS DESCRIBED BY NILGES, M. PROTEINS (1993) 17:297- 309. SYMMETRY TERMS WERE EMPLOYED FOR C-ALPHA CARBONS ONLY. SEE JACS(1998)120: 1138-1145 FOR MORE DETAILS. | X-PLOR |
NMR Ensemble Information | |
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Conformer Selection Criteria | structures with the least restraint violations |
Conformers Calculated Total Number | 60 |
Conformers Submitted Total Number | 16 |
Representative Model | 11 (lowest energy) |
Additional NMR Experimental Information | |
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Details | THE STRUCTURE WAS DETERMINED USING 2D HOMONUCLEAR TECHNIQUES. BECAUSE ALPHA2D EXISTS AS A SYMMETRIC HOMODIMER, THERE EXISTS A PROBLEM OF DETERMINING WHETHER AN OBSERVED NOE ARISES FROM AN INTER- OR INTRA- MONOMER CORRELATION. THIS PROBLEM WAS DEALT WITH AS DESCRIBED REMARK 3. |
Computation: NMR Software | ||||
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# | Classification | Version | Software Name | Author |
1 | refinement | X-PLOR | 3.1 | BRUNGER |
2 | structure solution | X-PLOR | 3.1 | BRUNGER |