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NMR SOLUTION STRUCTURE OF ALPHA-CONOTOXIN IM1 POINT MUTATION VARIANT D5N
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
TOCSY
4.1
298
2
ROESY
4.1
298
3
DQF-COSY
4.1
298
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DRX
400
NMR Refinement
Method
Details
Software
TORSION ANGLE DYNAMICS, RESTRAINED ENERGY MINIMISATION
FOR THE PRESENT STRUCTURES THE NMR DISTANCE CONSTRAINTS WERE WEIGHTED SUCH THAT A VIOLATION OF AN UPPER DISTANCE LIMIT OF 0.1 ANGSTROM CORRESPONDS TO AN ENERGY OF KT/2. THE CONSTRAINTS ON DIHEDRAL ANGLES RESULTING FROM MEASUREMENTS OF VICINAL COUPLING CONSTANTS WERE WEIGHTED SUCH THAT A VIOLATION OF 2.5 DEGREES CORRESPONDS TO AN ENERGY OF KT/2.
OPAL
NMR Ensemble Information
Conformer Selection Criteria
LOWEST RESIDUAL TARGET FUNCTION
Conformers Calculated Total Number
40
Conformers Submitted Total Number
20
Representative Model
7 (closest to the average)
Additional NMR Experimental Information
Details
DATA CONSIST OF 70 UPPER LIMITS ON DISTANCES OBTAINED FROM NOE MEASUREMENTS AND 34 ANGLE CONSTRAINTS OBTAINED FROM NOE MEASUREMENTS AND COUPLING CONSTANT MEASUREMENTS. THESE INPUT DATA ARE ALSO AVAILABLE FROM THE PROTEIN DATA BANK. FIVE STEREOSPECIFIC RESONANCE ASSIGNMENTS HAVE BEEN MADE. TORSION ANGLE DYNAMICS CALCULATIONS WERE PERFORMED WITH THE PROGRAM DYANA (P. GUNTERT, C. MUMENTHALER, K. WUTHRICH, J. MOL. BIOL. (1997) VOL. 273, 283-298). FOR THE RESTRAINED ENERGY MINIMIZATION THE PROGRAM OPAL (P. LUGINBUHL, P. GUNTERT, M. BILLETER, K. WUTHRICH, J. BIOMOL. NMR (1996) VOL. 8, 136-146) WAS USED. DEPOSITED COORDINATES ARE THOSE OF CONFORMERS 1-20 IN THE PAPER CITED ON *JRNL* RECORDS ABOVE. NO VIOLATIONS OF DISTANCE CONSTRAINTS FROM NOES EXCEED 0.10 ANGSTROMS, AND NO VIOLATIONS OF ANGLE CONSTRAINTS EXCEED 2.0 DEGREES. REPRESENTATIVE CONFORMER HAS THE SMALLEST RMSD TO THE MEAN STRUCTURE UPON SUPERPOSITION OF THE BACKBONE ATOMS N, CA, AND C' OF RESIDUES 2-11.