8CNS

The Hybrid Cluster Protein from the thermophilic methanogen Methanothermococcus thermolithotrophicus in a mixed redox state after soaking with hydroxylamine, at 1.36-A resolution.

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.6	293.15	Crystallisation was performed anaerobically by initial screening at 20 degree Celsius using the sitting drop method on 96-Well MRC 2-Drop polystyrene Crystallisation Plates (SWISSCI) in a Coy tent containing a N2/H2 (97:3%) atmosphere. The reservoir chamber was filled with 90 ul of crystallisation condition, and the crystallisation drop was formed by spotting 0.55 ul protein with 0.55 ul of 20% (w/v) PEG 3,350 and 200 mM Magnesium formate. The protein was crystallised at 9.9 mg/ml in 25 mM Tris/HCl pH 7.6, 2 mM dithiothreitol, 10% (v/v) glycerol. Densities in the electron density map suggest a contamination of another crystallisation condition spatially close and containing 30% (v/v) 2-Methyl-2,4-pentanediol, 20 mM Calcium chloride and 100 mM Sodium acetate, pH 4.6. The crystal was soaked for 5.7 min in a solution of 100 mM hydroxylamine/HCl in the crystallisation condition and then soaked in the crystallisation solution supplemented with 20% v/v ethylene glycol for a few seconds before freezing in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.41	49.06

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 97.773	α = 90
b = 102.186	β = 90
c = 58.323	γ = 90

Symmetry
Space Group	P 21 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	PIXEL	DECTRIS PILATUS 6M-F		2020-06-07	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	PETRA III, DESY BEAMLINE P11	1.000400	PETRA III, DESY	P11

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	1.356	70.645	94.9	0.11	0.118	0.043	0.999	11.5	7.1		89372

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	1.356	1.476	67.9		1.061	1.165	0.472	0.611	1.6	5.9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	FREE R-VALUE	1.36	51.09	1.34	89365	4367	70.35	0.1309	0.129	0.1661	18.44

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]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	14.413
f_angle_d	1.352
f_chiral_restr	0.098
f_bond_d	0.012
f_plane_restr	0.011

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4236
Nucleic Acid Atoms
Solvent Atoms	629
Heterogen Atoms	160

Software

Software
Software Name	Purpose
PHENIX	refinement
autoPROC	data reduction
autoPROC	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 R01GM133198.