ISDA

X-RAY DIFFRACTION

Crystallization Details

Method	pH	Temprature	Details
X-RAY DIFFRACTION	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.

Unit Cell:

a: 131.548 Å b: 197.399 Å c: 135.171 Å α: 90.00° β: 94.89° γ: 90.00°

Symmetry:

Space Group: P 1 21 1

Crystal Properties:

Matthew's Coefficient: 2.94 Solvent Content: 58.22

Refinement Statistics

Diffraction ID	Structure Solution Method	Cross Validation Method	Resolution Limit (High)	Resolution Limit (Low)	Number of Reflections (Observed)	Number of Reflections (R-free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	2.70	49.10	128533	6728	68.46	0.1972	0.2172	70.78

Data Collection

Overall

Resolution Limit (High)	Resolution Limit (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym I (Observed)	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
2.70	78.845	88.1	0.062	?	17.4	4.3	?	128572	?	?	65.7

Highest Resolution Shell

#	Resolution Limits (Low)	Resolution Limits (High)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.700	2.878	89.8	?	?	2.0	4.4	?

Diffraction

Diffraction experiment

Crystal ID	Scattering Type	Data Collection Temprature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1		100 K			?

Radiation Source

Source	Type	Wavelength List	Synchrotron Site	Beamline
SYNCHROTRON	SLS BEAMLINE X06DA	0.97949	SLS	X06DA

Software