1PB1

A four location model to explain the stereospecificity of proteins.

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.2	295	IDH, stored in metal-free final buffer, was diluted to 25, 30, 35 and 40 mg/ml using metal-free 2X buffer; (70mM Na2HPO4 , 18 mM citric acid, 200 mM NaCl, 0.4 mM DTT, pH 5.4). and was crystallized from hanging drops using 5 l each of these IDH solutions and 5 l each of 34, 36, 38, 40, 42, and 44 % (NH4)2SO4 solutions in crystallization buffer (35mM Na2HPO4 , 9 mM citric acid, 100 mM NaCl, 0.2 mM DTT at pH 5.4). , pH 6.2, VAPOR DIFFUSION, HANGING DROP, temperature 22K

Crystal Properties
Matthews coefficient	Solvent content
4.38	71.9

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 103.654	α = 90
b = 103.654	β = 90
c = 149.391	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	ADSC QUANTUM 4		1999-01-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 5.0.2	1.0	ALS	5.0.2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.7	25	92.7			91206	83266			17.7

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	1.7	1.76	84.6		0.212	6.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1.7	24.79	74903	83226	8363	92.7	0.185	0.185	0.185	0.211	RANDOM	21.4

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]
2.09			2.09		-4.17

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	25
c_scangle_it	3.84
c_scbond_it	2.48
c_mcangle_it	2
c_angle_deg	1.6
c_mcbond_it	1.31
c_improper_angle_d	1.02
c_bond_d	0.015

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3213
Nucleic Acid Atoms
Solvent Atoms	337
Heterogen Atoms	36

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
EPMR	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.