8OOZ

Glutamine synthetase from Methermicoccus shengliensis in complex with MgATP at 2.7 A resolution

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% v/v glycerol, and 2 mM dithiothreitol. The reservoir contained 90 ul precipitant (1.6 M sodium citrate tribasic dihydrate). 0.55 uL protein was mixed with 0.55 uL precipitant. Crystals were soaked for 4 min in the crystallization solution supplemented with 10 mM ATP/Mg2+/sodium glutamate and then back soaked in the crystallization solution supplemented with 25% glycerol prior to freezing in liquid nitrogen.

Crystal Properties
Matthews coefficient	Solvent content
2.94	58.22

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 131.548	α = 90
b = 197.399	β = 94.89
c = 135.171	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		2021-11-27	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SLS BEAMLINE X06DA	0.97949	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	2.7	78.845	88.1	0.062	0.07	0.033	0.999	17.4	4.3		128572			65.7

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	2.7	2.878	89.8		0.688	0.784	0.37	0.701	2	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	2.7	49.1	1.34	128533	6728	68.46	0.1972	0.1961	0.2172	70.78

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	16.205
f_angle_d	1.348
f_chiral_restr	0.088
f_bond_d	0.011
f_plane_restr	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	40815
Nucleic Acid Atoms
Solvent Atoms	33
Heterogen Atoms	431

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.