7B2C

Crystal structure of the ethyl-coenzyme M reductase from Candidatus Ethanoperedens thermophilum gassed with xenon

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	7B1S

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8.5	293.15	Crystals were obtained by initial screening at 20 degree Celsius using the sitting drop method on a 96-Well MRC 2-Drop Crystallization Plates in polystyrene (SWISSCI). The crystallization reservoir contained 90 ul of mother liquor, crystallization drop contained a mixture of 0.6 ul protein at 16.22 mg.ml-1 and 0.6 ul precipitant. The crystal was obtained by initial screening using the JBScreen Pentaerythritol screen from Jena Bioscience in a Coy tent under an N2/H2 atmosphere (95:5 %). The crystallization reservoir contained 45 % (w/v) Pentaerythritol Propoxylate (5/4 PO/OH), 100 mM Tris pH 8.5 and 400 mM potassium chloride. Crystal was harvested using a MiTeGen MicroRT loop. In order to protect the crystal during xenon pressurisation, a part of the plastic capillary, usually used for room temperature diffraction experiments, was placed around it. The loop was then mounted in an Oxford Xcell xenon chamber. Xenon pressure was gradually increased using a manual pump to reach 25 bars. After 7 min, pressure was slowly released and the crystal immediately plunged in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.28	46.06

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 83.791	α = 90
b = 147.186	β = 107.2
c = 113.376	γ = 90

Symmetry
Space Group	P 1 21 1

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 2M-F		2019-09-29	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X06DA	1.54981	SLS	X06DA

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	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	1.8	60.87	98.1	0.105	0.046	0.997	11.7	6		232772

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.8	1.84	94.6		0.652	0.331	0.739	2	4.5

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	7B1S	1.8	35.9	232696	11690	96.2	0.176	0.174	0.201	RANDOM	17.66

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]
6.5101		-3.9016	-4.8187		-1.6913

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	15.55
t_omega_torsion	2.81
t_angle_deg	0.99
t_bond_d	0.008
t_dihedral_angle_d
t_trig_c_planes
t_gen_planes
t_it
t_nbd
t_improper_torsion
t_pseud_angle
t_chiral_improper_torsion
t_sum_occupancies
t_utility_distance
t_utility_angle
t_utility_torsion
t_ideal_dist_contact

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	20523
Nucleic Acid Atoms
Solvent Atoms	2346
Heterogen Atoms	296

Software

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