8OOW

Glutamine synthetase from Methermicoccus shengliensis at a resolution of 2.64 A

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.6	293.15	The protein was crystallized fresh without any freezing step, and obtained 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). Crystallization was performed at 9 mg/ml glutamine synthetase in 25 mM Tris/HCl pH 7.6, 10% glycerol, and 2 mM dithiothreitol. The reservoir contained 90 ul precipitant the following crystallization solution: 200 mM ammonium formate and 20 % (w/v) polyethylene glycol 3,350. 0.55 uL protein was mixed with 0.55 uL precipitant. Crystals were soaked in mother liquor with 25% v/v ethylene glycol before freezing in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.87	57.11

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 130.92	α = 90
b = 195.646	β = 94.71
c = 133.443	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		2021-09-04	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X06DA	1.00004	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	2.636	109.987	90.3	0.076	0.084	0.035	0.999	15.5	5.7		123574			66.8

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	2.636	2.933	78.7		0.87	0.989	0.467	0.6	1.6	4.4

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	2.64	62.96	1.35	123529	6181	62.77	0.1931	0.1914	0.2252	72.24

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	16.177
f_angle_d	1.35
f_chiral_restr	0.089
f_plane_restr	0.018
f_bond_d	0.011

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	40821
Nucleic Acid Atoms
Solvent Atoms	66
Heterogen Atoms	76

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.