8OOQ

Glutamine synthetase from Methanothermococcus thermolithotrophicus in complex with 2-oxoglutarate and Mg at 2.91 A resolution

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	8OOO

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	5	293.15	The protein was crystallized fresh without any freezing step, and crystallization was performed through the sitting drop method on a 96-Well MRC 2-Drop Crystallization Plates in polystyrene (SWISSCI, United Kingdom) under anaerobic conditions (N2:H2, gas ratio of 97:3). The enzyme was crystallized at 3.4 mg/ml with a final concentration of 2 mM 2-oxoglutarate and 2 mM MgCl in 25 mM Tris/HCl pH 7.6, 10% v/v glycerol, 150 mM NaCl, and 2 mM dithiothreitol. The crystallization reservoir contained 90 ul of mother liquor (25 % w/v Polyethylene glycol 1,500 and 100 mM SPG (succinic acid, sodium dihydrogen phosphate, and glycine) buffer pH 5.0), and the crystallization drop contained 0.6 ul protein with ligands and 0.6 ul precipitant. Crystals were soaked in the mother liquor supplemented with 15 % v/v glycerol prior to freezing in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.54	51.68

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 131.808	α = 89.95
b = 131.927	β = 89.86
c = 203.544	γ = 60.05

Symmetry
Space Group	P 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		2020-12-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X06DA	0.99999	SLS	X06DA

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	2.908	203.543	91.7	0.122	0.144	0.076	0.993	5.9	3.5		169224			51.2

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	2.908	3.124	69.3		0.501	0.611	0.344	0.548	1.6	3

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	2.91	43.74	1.97	169113	8324	64.78	0.2553	0.2541	0.278

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	13.228
f_angle_d	1.274
f_chiral_restr	0.081
f_bond_d	0.01
f_plane_restr	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	84792
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms	371

Software

Software
Software Name	Purpose
PHENIX	refinement
autoPROC	data reduction
STARANISO	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.