1C57

DIRECT DETERMINATION OF THE POSITIONS OF DEUTERIUM ATOMS OF BOUND WATER IN CONCANAVALIN A BY NEUTRON LAUE CRYSTALLOGRAPHY

NEUTRON DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		6.5		CRYSTALS SELECTED FOR NEUTRON STUDY WERE TRANSFERRED TO A 1ML BUFFERMADE UP OF 99.9% D2O WITH 0.1M NANO3, 0.05M TRIS-ACETATE, 1MM MNCL2 AND 1MM CACL2; PH 6.5.

Crystal Properties
Matthews coefficient	Solvent content
2.4	48.31

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 89.11	α = 90
b = 87.58	β = 90
c = 63.26	γ = 90

Symmetry
Space Group	I 2 2 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	neutron	293	CYLINDRICAL DETECTOR EIGHT IMAGE PLATE EACH 200X200 MM	FUJI		1997-10-21	L	LAUE

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	NUCLEAR REACTOR	ILL BEAMLINE LADI	2.39-3.52	ILL	LADI

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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	2.4	15.79	89	0.222	0.222	2.8	4.4		8605

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	2.4	2.48	82.2		0.436	1.4	3.9

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
NEUTRON DIFFRACTION		THROUGHOUT	2.4	15.792	8605	475	88.5	0.27	0.27	0.301	RANDOM	22.9

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	18.2
x_improper_angle_d	3.7
x_angle_deg	2.2
x_bond_d	0.018
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1809
Nucleic Acid Atoms
Solvent Atoms	148
Heterogen Atoms	2

Software

Software
Software Name	Purpose
X-PLOR	refinement
INTLAUE	data reduction
CCP4	data scaling