1B21

DELETION OF A BURIED SALT BRIDGE IN BARNASE

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5		DROP: 8-12 MG/ML PROTEIN 6 MM ZNSO4 0.6 M (NH4)2SO4 WELL: 2.58-2.73 M AMMONIUM PHOSPHATE BUFFER, PH 7.5 1-2 MM ZNSO4 0.15-0.30 M (NH4)2SO4 5-10 MM NH4OH

Crystal Properties
Matthews coefficient	Solvent content
2.11	42

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.78	α = 90
b = 57.78	β = 90
c = 81.42	γ = 120

Symmetry
Space Group	P 32

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MARRESEARCH	SUPER DOUBLE MIRRORS	1997-05-19	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	ELLIOTT GX-13

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	2.01	21.32	91.4	0.067	10.06	1.8		18526			12.67

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)
	2.01	2.12	59.3		0.144	5.1	1.6

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-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	OTHER	THROUGHOUT	2	19	16993		91.4	0.188	0.268	19.3

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
p_transverse_tor	17.7
p_staggered_tor	16.8
p_planar_tor	3.3
p_mcangle_it	1.369
p_scangle_it	1.238
p_mcbond_it	0.821
p_scbond_it	0.79
p_multtor_nbd	0.235
p_singtor_nbd	0.17
p_xyhbond_nbd	0.149
p_chiral_restr	0.084
p_angle_d	0.022
p_planar_d	0.019
p_bond_d	0.006
p_angle_deg
p_hb_or_metal_coord
p_plane_restr
p_xhyhbond_nbd
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2590
Nucleic Acid Atoms
Solvent Atoms	339
Heterogen Atoms	1

Software

Software
Software Name	Purpose
X-PLOR	model building
REFMAC	refinement
iMOSFLM	data reduction
CCP4	data scaling
X-PLOR	phasing