4AJ3

3D structure of E. coli Isocitrate Dehydrogenase in complex with Isocitrate, calcium(II) and NADP - The pseudo-Michaelis complex

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1AI2	PDB ENTRY 1AI2

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1				1.85 M NH4SO4, 50 MM CITRIC ACID/NA2HPO4 BUFFER PH 5.8, 0.1 M NACL AND 0.2 M DTT

Crystal Properties
Matthews coefficient	Solvent content
4.5	72

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 105.297	α = 90
b = 105.297	β = 90
c = 145.723	γ = 90

Symmetry
Space Group	P 43 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	BRUKER AXS PT135	MONTEL MIRRORS		M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	BRUKER AXS MICROSTAR

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	1.9	47.1	99.9	0.11	11.2	5.7		65181			19.9

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.9	2	100		0.54	1.7	3.4

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	PDB ENTRY 1AI2	1.9	44.809	1.33	65078	3272	99.94	0.1904	0.1886	0.224

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]
-5.8691			-5.8691		-11.241

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	14.554
f_angle_d	1.088
f_chiral_restr	0.07
f_bond_d	0.007
f_plane_restr	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3210
Nucleic Acid Atoms
Solvent Atoms	374
Heterogen Atoms	62

Software

Software
Software Name	Purpose
PHENIX	refinement
SAINT	data reduction
SADABS	data scaling
PHASER	phasing

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.