3BKD

High resolution Crystal structure of Transmembrane domain of M2 protein

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.3	298	Protein solution: 0.8mM protein, 32mM n-octyl-beta-D-glucopyranoside and 5%v/v xylitol. Reservoir solution: 50mM Tris-Hcl, 500mM MgCl2, 21% PEG 350 MME, pH 7.3, VAPOR DIFFUSION, HANGING DROP, temperature 298.0K

Crystal Properties
Matthews coefficient	Solvent content
2.67	53.91

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 38.753	α = 90
b = 56.557	β = 103.53
c = 56.009	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	CCD	ADSC QUANTUM 315		2001-10-01	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS BEAMLINE X25	0.97853	NSLS	X25

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	94.9	0.062	22.4	3.4	15355	14567		1	37.1

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	2.05	75.1		0.305	1.9	2	777

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 (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	Amantandine-bound M2TM; G34A mutant	2.05	20	14047	747	99.32	0.244	0.22158	0.21908	0.26871	RANDOM	31.117

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]
-0.12		-0.04	2.17		-2.07

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	37.195
r_dihedral_angle_4_deg	19.918
r_dihedral_angle_3_deg	13.966
r_dihedral_angle_1_deg	4.424
r_scangle_it	2.289
r_scbond_it	1.662
r_angle_refined_deg	1.348
r_mcangle_it	1.147
r_mcbond_it	0.887
r_xyhbond_nbd_refined	0.499
r_nbtor_refined	0.299
r_symmetry_hbond_refined	0.202
r_symmetry_vdw_refined	0.2
r_nbd_refined	0.188
r_chiral_restr	0.08
r_bond_refined_d	0.011
r_gen_planes_refined	0.004
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	1544
Nucleic Acid Atoms
Solvent Atoms	39
Heterogen Atoms	164

Software

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