1SMN

IDENTIFICATION OF THE SERRATIA ENDONUCLEASE DIMER: STRUCTURAL BASIS AND IMPLICATIONS FOR CATALYSIS

X-RAY DIFFRACTION

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Crystallization

Crystal Properties
Matthews coefficient	Solvent content
2.56	51.93

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 106.7	α = 90
b = 74.5	β = 90
c = 68.9	γ = 90

Symmetry
Space Group	P 21 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		DIFFRACTOMETER	ENRAF-NONIUS FAST		1993-03-08
2	1		DIFFRACTOMETER	ENRAF-NONIUS FAST		1993-04-09

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1
2

Data Collection

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION		2.04	6	2	29445		92.6	0.168	0.168		11

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	25.5
x_angle_deg	1.81
x_improper_angle_d	1.6
x_bond_d	0.015
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	3694
Nucleic Acid Atoms
Solvent Atoms	224
Heterogen Atoms

Software

Software
Software Name	Purpose
MADNES	data collection
PROCOR	data collection
XSCALE	data scaling
X-PLOR	model building
X-PLOR	refinement
MADNES	data reduction
PROCOR	data reduction
X-PLOR	phasing