2XR0

Room temperature X-ray structure of the perdeuterated Toho-1 R274N R276N double mutant beta-lactamase

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6.5		2.0 A AMMONIUM SULFATE, 0.1 M SODIUM CITRATE, PD 5.1. PREPARED IN 99.9% D2O AND MIXED 1:1 WITH PERDEUTERATED PROTEIN PREPARED IN 20 MM NA MES AT PD 6.1 (PH 6.5).

Crystal Properties
Matthews coefficient	Solvent content
2.77	55.55

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 73.5	α = 90
b = 73.5	β = 90
c = 99.33	γ = 120

Symmetry
Space Group	P 32 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	293	CCD	MARRESEARCH MX-300		2010-04-04	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 22-ID		APS	22-ID

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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
1	2.2	29.54	98.6	0.05	31.3	7.5		15962		2	16.86

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.2	2.32	97.9		0.83	22	7.5

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	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	PDB ENTRY 2WYX	2.2	29.54	1.43	15956	800	98.2	0.135	0.133	0.173	19.65

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]
-1.0524			-1.0524		2.1047

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	13.134
f_angle_d	1.122
f_chiral_restr	0.07
f_bond_d	0.009
f_plane_restr	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1964
Nucleic Acid Atoms
Solvent Atoms	154
Heterogen Atoms	15

Software

Software
Software Name	Purpose
PHENIX	refinement
MOSFLM	data reduction
SCALA	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.