1GKX

Branched-chain alpha-ketoacid dehydrogenase kinase (BCK)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	7.5	293	VAPOR DIFFUSION, 20C, EQUAL AMOUNTS OF BCK (20 MG/ML IN 50 MM HEPES, PH 7.5, 1 M SODIUM CHLORIDE, 250 MM POTASSIUM CHLORIDE, 300 MM ARGININE, 20 MM BETA- MERCAPTOETHANOL, 2 MM BENZAMIDINE, 2 MM MAGNESIUM CHLORIDE, 0.5 MM PMSF, 10% (W/V) GLYCEROL) AND RESERVOIR (8%(W/V) PEG-6000, 5% (V/V) ETHYLENE GLYCOL, 1 M NACL, 20 MM BETA-MERCAPTOETHANOL)

Crystal Properties
Matthews coefficient	Solvent content
3.4	64

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 129.37	α = 90
b = 129.37	β = 90
c = 73.35	γ = 90

Symmetry
Space Group	P 42 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	SBC-CAT		2001-06-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 19-ID		APS	19-ID

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	2.3	48.52	98	0.073	29	9.7		27710		-3	65.8

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	2.3	2.34	97.5		0.674	1.8	1.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	BRANCHED-CHAIN ALPHA-KETOACID DEHYDROGENASE KINASE (BCK) COMPLEXED WITH ATP-GAMMA-S	2.3	48.52	26532	1407	94	0.241	0.241	0.273	RANDOM	68

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]
-0.5			-0.5		1

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	21.2
c_scangle_it	3.58
c_mcangle_it	2.7
c_scbond_it	2.32
c_mcbond_it	1.6
c_angle_deg	1.2
c_improper_angle_d	0.82
c_bond_d	0.007
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2492
Nucleic Acid Atoms
Solvent Atoms	87
Heterogen Atoms	4

Software

Software
Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling
CNS	phasing