Experiment: 1SOR

Aquaporin-0 membrane junctions reveal the structure of a closed water pore

ELECTRON CRYSTALLOGRAPHY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1J4N	PDB entry 1J4N

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICRODIALYSIS	6	298	magnesium chloride, sodium chloride, MES, sodium azide, DTT, pH 6, MICRODIALYSIS, temperature 25K

Crystal Properties
Matthews coefficient	Solvent content
3.45	64.04

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 65.5	α = 90
b = 65.5	β = 90
c = 160	γ = 90

Symmetry
Space Group	P 4 2 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	electron	100	CCD	Gatan 2K x 2K	crystals tilted to 0, 20, 45, 60 and 70 degrees	2003-01-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ELECTRON MICROSCOPE	Tecnai T20

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	3	30	88	0.16		6.7		6635

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	3	3.5	82		0.54		4.5

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 (All)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
ELECTRON CRYSTALLOGRAPHY	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 1J4N	3	22.25	6635	6635	718	88.2	0.307	0.299	0.299	0.2978	0.338	0.3368	RANDOM	81.8

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]
-13.27			-13.27		26.54

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	17.4
c_mcangle_it	2.27
c_scangle_it	1.94
c_mcbond_it	1.26
c_scbond_it	1.16
c_angle_deg	1
c_improper_angle_d	0.8
c_bond_d	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1778
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
CNS	refinement
MOLREP	phasing

Sample
aquaporin-0

Specimen Preparation
Sample Aggregation State	2D ARRAY
Embedding Material	glucose
Embedding Details	10% glucose

3D Reconstruction
Reconstruction Method	CRYSTALLOGRAPHY

Data Acquisition
Detector Type	GENERIC GATAN (2k x 2k)
Electron Dose (electrons/Å**2)

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TECNAI F20
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	DIFFRACTION
Specimen Holder Model
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details