2P9H

High resolution structure of the Lactose Repressor bound to IPTG

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	5.6	281	1.4 M Sodium Acetate, 0.1 M Sodium Citrate, pH 5.6, VAPOR DIFFUSION, HANGING DROP, temperature 281K

Crystal Properties
Matthews coefficient	Solvent content
2.72	54.8

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 77.125	α = 90
b = 77.125	β = 90
c = 210.583	γ = 90

Symmetry
Space Group	P 41 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	ADSC QUANTUM 210		2006-07-29	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X6A	0.92	NSLS	X6A

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	50	83.6	0.136	10.7		43939	36802	-3	-3

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)
	2	2.06	37.5		0.264	2.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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 1EFA	2	34.04	43939	34872	1868	83.56	0.18776	0.18463	0.24552	RANDOM	32.852

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]
1.24			1.24		-2.49

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	39.505
r_dihedral_angle_4_deg	22.436
r_dihedral_angle_3_deg	16.713
r_dihedral_angle_1_deg	7.147
r_scangle_it	4.032
r_scbond_it	2.543
r_angle_refined_deg	1.71
r_mcangle_it	1.668
r_mcbond_it	1.022
r_nbtor_refined	0.315
r_symmetry_vdw_refined	0.297
r_nbd_refined	0.242
r_symmetry_hbond_refined	0.225
r_xyhbond_nbd_refined	0.2
r_chiral_restr	0.111
r_bond_refined_d	0.017
r_gen_planes_refined	0.007
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
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4026
Nucleic Acid Atoms
Solvent Atoms	738
Heterogen Atoms	30

Software

Software
Software Name	Purpose
REFMAC	refinement
ADSC	data collection
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing