Experiment: 7Q03

Ketol-acid reductoisomerase from Methanothermococcus thermolithotrophicus in the close state with NADP and Mg2+

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	4TSK

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8	291.15	The reservoir was filled with 90 ul of crystallisation solution: 20% (w/v) PEG 6000, 100 mM Tris/HCl pH 8.0 and 200 mM lithium chloride. The protein was crystallized at 13 mg/ml in the following buffer 25 mM Tris/HCl pH 7.6, 2 mM dithiothreitol, 10% (v/v) glycerol. Drops of 0.7 ul protein with 0.7 ul of crystallisation solution were applied on the shelf. Crystals were soaked in the crystallisation solution supplemented with 30% (v/v) ethylene glycol for few seconds before freezing in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.5	50.84

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 129.882	α = 90
b = 129.882	β = 90
c = 129.882	γ = 90

Symmetry
Space Group	I 2 3

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	PIXEL	DECTRIS PILATUS 6M		2015-11-30	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X10SA	1.73913	SLS	X10SA

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	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	2.1	45.92	100	0.095	0.098	0.026	0.999	18.3	14.3		21408

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.1	2.21	100		0.744	0.774	0.212	0.468	3.5	13.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation 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 (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	4TSK	2.1	41.07	39.04	21408	1093	99.99	0.1886	0.1759	0.1773	0.1886	0.1894	45.8799

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]

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2542
Nucleic Acid Atoms
Solvent Atoms	63
Heterogen Atoms	96

Software

Software
Software Name	Purpose
PHENIX	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
SCALA	data scaling
PHENIX	phasing