Solution Structure of the Enzyme I Dimer Complexed with HPr Using Residual Dipolar Couplings and Small Angle X-Ray Scattering
SOLUTION NMR - SOLUTION SCATTERING
Solution Scattering Data Acquistion
1
2
Scattering Type
x-ray
neutron
Radiation/Neutron Source
ALS
NIST 30M NG3
Synchrotron
synchrotron
neutron source
Beamline Type
2.12-IDC
Detector Type
GOLD CCD
Detector Manufacturer Details
Temperature (K)
298
298
pH
Numer of Time Frames Used
20
Protein Concentration Range (mg/mL)
2.5-5
5
Sample Buffer
Data Reduction Software
Guiner Mean Radius Of Gyration (nm)
4.59
4.69
Sigma Mean Radius Of Gyration
R(XS-1) Mean Cross Sectional Radii (nm)
R(XS-1) Sigma Mean Cross Sectional Radii
R(XS-2) Mean Cross Sectional Radii (nm)
R(XS-2) Sigma Mean Cross Sectional Radii
P(R) Protein Length (nm)
16.0
16.0
NMR Experiment
Experiment
Type
Sample Contents
Solvent
Ionic Strength
pH
Pressure
Temperature (K)
Spectrometer
1
TROSY-BASED 1H-15N CORRELATION SPECTROSCOPY
90% H2O/10% D2O
7.4
1.0 atm
310.0
NMR Spectrometer Information
Spectrometer
Manufacturer
Model
Field Strength
1
Bruker
DRX
800
NMR Refinement
Method
Details
Software
simulated annealing
REFINEMENT DETAILS CAN BE FOUND IN THE PRIMARY CITATION. THE INITIAL STRUCTURE OF THE EI DIMER COMPLEXED WITH HPR WAS CONSTRUCTED AS A HYBRID OF THE CRYSTAL STRUCTURE OF PHOSPHORYLATED EI INTERMEDIATE CAPTURED BY THE INHIBITOR OXALATE (PDB CODE 2HWG) AND THE NMR STRUCTURE OF THE EIN-HPR COMPLEX (PDB CODE 3EZA). THROUGHOUT THE STRUCTURE DETERMINATION, THE BACKBONE ATOMIC COORDINATES OF EACH EIN-HPR COMPLEX (RESIDUES 1-254 AND 601-685) WERE TREATED AS RIGID BODIES, WITH THE TWO SYMMETRY RELATED EIC DOMAINS (RESIDUES 262- 573) HELD FIXED IN SPACE. COORDINATES IN THE LINKER REGION (RESIDUES 255-261) WERE ALLOWED VARYING DEGREES OF FREEDOM DURING THE CALCULATION THROUGH THE USE OF THE INTERNAL VARIABLE MODULE (IVM) OF XPLOR-NIH. THE ENSEMBLE OF CALCULATED STRUCTURES FELL IN TWO CLUSTERS, THE REGULARIZED REFINED MEAN OF EACH IS INCLUDED BELOW AS MODELS 1 AND 2, RESPECTIVELY. STRUCTURAL STATISTICS: CLUSTER 1: SAXS CHI2 Q->0.44 0.63+/-0.11 SAXS CHI2 FULL RANGE FIT 0.45+/-0.07 SANS CHI2 1.38+/-0.51 RDC R-FACTOR 16.30+/-0.03 % RDC DA 13.73+/-0.05 HZ RDC RHOMBICITY 0.63+/-0.00 MODEL 1: SAXS CHI2 Q->0.44 0.62 SAXS CHI2 FULL RANGE FIT 0.42 SANS CHI2 1.30 RDC R-FACTOR 16.27 % RDC DA 13.74 HZ RDC RHOMBICITY 0.63 STRUCTURAL STATISTICS: CLUSTER 2 SAXS CHI2 Q->0.44 0.76+/-0.07 SAXS CHI2 FULL RANGE FIT 0.48+/-0.06 SANS CHI2 2.97+/-0.62 RDC R-FACTOR 16.25+/-0.02 % RDC DA 13.83+/-0.08 HZ RDC RHOMBICITY 0.63+/-0.00 MODEL 2 SAXS CHI2 Q->0.44 0.78 SAXS CHI2 FULL RANGE FIT 0.49 SANS CHI2 2.82 RDC R-FACTOR 16.25 % RDC DA 13.85 HZ RDC RHOMBICITY 0.63
