1B20

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	41.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.63	α = 90
b = 57.63	β = 90
c = 81.3	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		1998-02-19	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SRS BEAMLINE PX7.2		SRS	PX7.2

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	1.71	31.47	98.1	0.064	13.42	3.5		31946			15.52

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)
	1.71	1.76	86.4		0.229	5.52	3.4

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	1.7	27.1	30329		98.1	0.166	0.217	24.45

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	18
p_staggered_tor	14.5
p_planar_tor	4.4
p_scangle_it	2.309
p_mcangle_it	1.87
p_scbond_it	1.591
p_mcbond_it	1.307
p_multtor_nbd	0.252
p_singtor_nbd	0.164
p_xyhbond_nbd	0.148
p_chiral_restr	0.122
p_planar_d	0.029
p_angle_d	0.028
p_bond_d	0.012
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	2611
Nucleic Acid Atoms
Solvent Atoms	488
Heterogen Atoms	3

Software

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