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SOLUTION STRUCTURE OF DELTA-5-3-KETOSTEROID ISOMERASE COMPLEXED WITH THE STEROID 19-NORTESTOSTERONE-HEMISUCCINATE
SOLUTION NMR
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
2D NOESY
30 mM
7.2
1 atm
310
2
2D TOCSY
30 mM
7.2
1 atm
310
3
2D 1H-15N HSQC
30 mM
7.2
1 atm
310
4
2D 1H-13C CT-HSQC
30 mM
7.2
1 atm
310
5
3D 1H-13C-FILTERED NOESY-HSQC
30 mM
7.2
1 atm
310
6
3D 1H-15N TOCSY-HSQC
30 mM
7.2
1 atm
310
7
3D 1H-13C-NOESY-HSQC
30 mM
7.2
1 atm
310
8
3D 1H-15N HMQC-NOESY-HSQC
30 mM
7.2
1 atm
310
9
3D HCCH-TOCSY
30 mM
7.2
1 atm
310
10
3D 1H-13C HMQC-NOESY-HSQC
30 mM
7.2
1 atm
310
11
3D HNCO
30 mM
7.2
1 atm
310
12
3D HNCACB
30 mM
7.2
1 atm
310
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Varian
UNITYPLUS
600
NMR Refinement
Method
Details
Software
DISTANCE GEOMETRY, SIMULATED ANNEALING AND REFINEMENT CALCULATIONS
DURING THE REFINEMENT, THE NON-BONDED INTERACTIONS WERE MODELED ONLY BY A
QUADRATIC REPULSIVE ENERGY TERM, WHILE THE ATTRACTIVE COMPONENT OF THE LENNARD-
JONES POTENTIAL AND THE ELECTROSTATIC ENERGY WERE TURNED OFF. AT THE FINAL
STAGES OF REFINEMENT, A SQUARE-WELL POTENTIAL ENERGY FUNCTION WAS USED FOR THE
NOE AND THE DIHEDRAL ANGLE RESTRANTS WITH A FORCE OF 500 KCAL MOL-1 ANG-2 AND
200 KCAL MOL-1 RAD-2, RESPECTIVELY. OF THE 120 EMBEDDED SUBSTRUCTURES, 60
CONVERGED TO ACCEPTABLE STRUCTURES WITH NOE VIOLATION EQUAL OR LESS THAN
0.5ANG. OF THESE, 15 BEST STRUCTURES WITH NOE VIOLATIONS EQUAL OR LESS THAN
0.35 ANG AND DIHEDRAL VIOLATION < 5 DEG WERE SELECTED. MODEL 1 (STRUCTURE 1)
OF THE 15 STRUCTURES OF THE KSI-19NTHS COMPLEX IS THE LOWEST ENERGY STRUCTURE.
X-PLOR
NMR Ensemble Information
Conformer Selection Criteria
NOE VIOLATION =< 0.35A AND DIHEDRAL VIOLATION < 5 DEG.
Conformers Calculated Total Number
120
Conformers Submitted Total Number
15
Representative Model
1 (n/a)
Additional NMR Experimental Information
Details
THE STRUCTURE OF THE 3-KETOSTEROID ISOMERASE 19-NORTESTOSTERONE HEMISUCCINATE (
19-NTHS) COMPLEX WAS DETERMINED FROM BOTH 2D NOESY, 3D NOESY AND TRIPLE
RESONANCE NMR SPECTRA ON AN UNLABELED SAMPLE (2D NOESY), 15N-LABELED, 13C-,
15N-UNIFORMLY LABELED, AND/OR 13C-,15N/15N-HETEROLABELED ISOMERASE WITH 1.1 MM
19-NTHS. 3D NOESY AND TRIPLE RESONACE SPECTRA ON THE 15N-UNIFORMLY LABELED AND
13C-,15N-UNIFORMLY SAMPLES WERE USED FOR 1H, 15N,13C ASSIGNMENTS AS WELL AS
STRUCTURAL INFORMATION FOR EACH SUBUNIT. THE 1H-13C-FILTERED NOESY-HSQC OF A
13C, 15N/15N-HETEROLABELED SAMPLE PROVIDED CRITICAL NOES BETWEEN THE IDENTICAL
MONOMERS OF THE HOMODIMER WHICH LED TO THE SOLUTION STRUCTURE OF KSI COMPLEXED
TO 19-NTHS.