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SOLUTION NMR STRUCTURE OF RECOMBINANT SYRIAN HAMSTER PRION PROTEIN RPRP(90-231) , 25 STRUCTURES
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
N15 NOESY
5.2
1 atm
303
2
C13 NOESY
5.2
1 atm
303
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DMX
750
2
Bruker
AMX
600
3
Varian
UNITYPLUS
500
NMR Refinement
Method
Details
Software
NMR-RESTRAINED SIMULATED ANNEALING, MOLECULAR DYNAMICS, AND ENERGY MINIMIZATION.
NMR DISTANCE RESTRAINTS WERE ASSIGNED WITH THE AID OF ARIA (AMBIGUOUS RESTRAINTS FOR ITERATIVE ASSIGNMENT) PROCEDURE, RESULTING IN 2778 UNAMBIGUOUS AND 306 AMBIGUOUS DISTANCE RESTRAINTS. 63 J COUPLING CONSTANTS, AND 44 HYDROGEN BOND RESTRAINTS WERE ALSO USED IN THE STRUCTURE CALCULATIONS. 100 STRUCTURES WERE CALCULATED USING XPLOR NMR- RESTRAINED SIMULATED ANNEALING PROTOCOL. RESIDUES 112-231 OF THE 25 STRUCTURES WITH LOWEST TOTAL ENERGY WERE EACH SUBJECTED TO 25PS RESTRAINED MOLECULAR DYNAMICS SIMULATION IN A 6 ANGSTROM SHELL OF WATER FOLLOWED BY ENERGY MINIMIZATION USING AMBER4.1 FORCE FIELD. THE AVERAGE VIOLATION FOR DISTANCE RESTRAINTS IS 0.032A, AND FOR J COUPLING CONSTANTS IS 0.059HZ. THE AVERAGE BACKBONE ATOMIC RMSD TO THE MEAN STRUCTURE IS 0.67A FOR RESIDUES 125-227 OF THE 25 STRUCTURES. THE REFINEMENT HAS BEEN SUBMITTED TO BIOCHEMISTRY WITH THE TITLE "SOLUTION STRUCTURE OF SYRIAN HAMSTER PRION PROTEIN RPRP(90-231)". NOTE, LOWER RESOLUTION STRUCTURES PUBLISHED ON PNAS 94, 10086 (1997) WERE CALCULATED WITH THE PROGRAM DIANA DEVELOPED IN WUTHRICH'S LAB.RESIDUES 90-124 OF RPRP(90-231) ARE LARGELY UNSTRUCTURED. RESIDUES 90-111 WERE EXCLUDED IN THE FINAL STAGE OF STRUCTURE REFINEMENT. THE COORDINATES DEPOSITED TO PDB CONTAIN RESIDUES 125-228.
ARIA
NMR Ensemble Information
Conformer Selection Criteria
TOTAL ENERGY
Conformers Calculated Total Number
100
Conformers Submitted Total Number
25
Representative Model
1 (n/a)
Additional NMR Experimental Information
Details
IONIC_STRENGTH: NULL PRESSURE: 1 ATM SOLVENT SYSTEM: 1MM PROTEIN, H2O, 20 MM SODIUM ACETATE THE 1H, 15N AND 13C RESONANCES WERE ASSIGNED USING TRIPLE RESONANCE NMR EXPERIMENTS HNCA, HNCACB, CBCACONNH, HNCO, HCCH-TOCSY ACQUIRED ON 500 AND 600 MHZ SPECTROMETERS WITH UNIFORMLY 13C/15N-LABELED SAMPLE. DISTANCE RESTRAINTS WERE OBTAINED FROM 750 MHZ 15N-HSQC-NOESY AND 13C-HSQC- NOESY SPECTRA WITH 100MS MIXING TIME.