2CKM

Torpedo californica acetylcholinesterase complexed with alkylene- linked bis-tacrine dimer (7 carbon linker)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		5.8	277	28-33% V/V PEG 200, 0.5M MES PH5.8, 4DEG CELSIUS, SEEDING, pH 5.80

Crystal Properties
Matthews coefficient	Solvent content
4.3	68

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 111.884	α = 90
b = 111.884	β = 90
c = 137.413	γ = 120

Symmetry
Space Group	P 31 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	120	IMAGE PLATE	RIGAKU RAXIS4++	OSMIC BLUE	2000-10-31	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH3R

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	2.15	30	92	0.05	10.8	2.9		80692			24.1

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	2.15	2.23	75.6		0.51		2.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	OTHER	THROUGHOUT	2.15	29.27	50424	2517	92	0.211	0.211	0.249	RANDOM	44.05

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]
8.34	6.53		8.34		-16.69

RMS Deviations
Key	Refinement Restraint Deviation
c_scangle_it	7.1
c_scbond_it	6.55
c_angle_deg	1.9
c_mcangle_it	1.81
c_mcbond_it	1.12
c_bond_d	0.018
c_bond_d_na
c_bond_d_prot
c_angle_d
c_angle_d_na
c_angle_d_prot
c_angle_deg_na
c_angle_deg_prot
c_dihedral_angle_d
c_dihedral_angle_d_na
c_dihedral_angle_d_prot
c_improper_angle_d
c_improper_angle_d_na
c_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4142
Nucleic Acid Atoms
Solvent Atoms	206
Heterogen Atoms	65

Software

Software
Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling