2ZQ8

Apo structure of class a beta-lactamase Toho-1 R274N/R276N double mutant

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2ZQ7	PDB ENTRY 2ZQ7

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.5	298	1.95-2.10M ammonium sulfate, 0.2M sodium citrate, PH5.50, VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.62	53.09

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 72.511	α = 90
b = 72.511	β = 90
c = 97.477	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	100	IMAGE PLATE	RIGAKU RAXIS V	mirrors	2007-11-21	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SPRING-8 BEAMLINE BL26B1	0.8	SPring-8	BL26B1

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	1.03	50	100	0.072	27.17	9.9		146345

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)
	1.03	1.05	99.9		0.356	7.33	9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 2ZQ7	1.03	50	138865	7323	99.93	0.13814	0.13763	0.1481	RANDOM	11.223

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]
-0.19	-0.09		-0.19		0.28

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.436
r_dihedral_angle_3_deg	11.132
r_dihedral_angle_4_deg	9.229
r_dihedral_angle_1_deg	6.247
r_sphericity_free	4.597
r_sphericity_bonded	4.228
r_scangle_it	3.096
r_scbond_it	2.221
r_mcangle_it	1.74
r_angle_refined_deg	1.415
r_mcbond_it	1.183
r_rigid_bond_restr	1.075
r_nbtor_refined	0.307
r_nbd_refined	0.204
r_symmetry_vdw_refined	0.163
r_xyhbond_nbd_refined	0.13
r_symmetry_hbond_refined	0.109
r_chiral_restr	0.093
r_bond_refined_d	0.009
r_gen_planes_refined	0.008
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2248
Nucleic Acid Atoms
Solvent Atoms	455
Heterogen Atoms	30

Software

Software
Software Name	Purpose
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
SCALEPACK	data scaling