1STH

TWO DISTINCTLY DIFFERENT METAL BINDING MODES ARE SEEN IN X-RAY CRYSTAL STRUCTURES OF STAPHYLOCOCCAL NUCLEASE-COBALT(II)-NUCLEOTIDE COMPLEXES

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1				CRYSTAL SOAKED FOR NINE MONTHS AT 277 K IN STABILIZING BUFFER COMPRISING 40% (WW) MPD IN 30 MM TRIS-CL PH 8.15, 50 UM COCL2, 100 UM POTASSIUM CITRATE AND 50 UM PDTP. SOME EVAPORATION OCCURRED DURING THIS PERIOD, SO MPD CONCENTRATION AT TIME OF DATA COLLECTION, WHILE NOT KNOWN PRECISELY, WAS SUBSTANTIALLY GREATER THAN 40%.

Crystal Properties
Matthews coefficient	Solvent content
2.11	41.82

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 47.48	α = 90
b = 47.48	β = 90
c = 63.21	γ = 90

Symmetry
Space Group	P 41

Data Collection

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION		1.85	6	11570		99	0.174	0.174		27

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	25.1
x_angle_deg	2.99
x_improper_angle_d	1.16
x_bond_d	0.014
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	1087
Nucleic Acid Atoms
Solvent Atoms	58
Heterogen Atoms	26

Software

Software
Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing