1QP6

SOLUTION STRUCTURE OF ALPHA2D


SOLUTION NMR
NMR Experiment
ExperimentTypeSample ContentsSolventIonic StrengthpHPressureTemperature (K)Spectrometer
12D NOESY2 MM ALPHA2D TRIS, PH 7.3, 25 C52 mM7.3AMBIENT298.0
2DQF-COSY2 MM ALPHA2D TRIS, PH 7.3, 25 C52 mM7.3AMBIENT298.0
3E-COSY2 MM ALPHA2D TRIS, PH 7.3, 25 C52 mM7.3AMBIENT298.0
NMR Spectrometer Information
SpectrometerManufacturerModelField Strength
1BrukerAMX600
NMR Refinement
MethodDetailsSoftware
SIMULATED ANNEALING FOR 48 PS AT 2000K FOLLOWED BY A SLOW COOL TO 50KSTRUCTURE 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
Conformer Selection Criteriastructures with the least restraint violations
Conformers Calculated Total Number60
Conformers Submitted Total Number16
Representative Model11 (lowest energy)
Additional NMR Experimental Information
DetailsTHE 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
#ClassificationVersionSoftware NameAuthor
1refinementX-PLOR3.1BRUNGER
2structure solutionX-PLOR3.1BRUNGER