2HIN

Structure of N15 Cro at 1.05 A: an ortholog of lambda Cro with a completely different but equally effective dimerization mechanism

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.5	293	0.1 M Tris, 1.8 M ammonium sulfate, 17.5 mg/mL protein, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
1.76	30.34

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 25.579	α = 90
b = 49.512	β = 91.75
c = 43.768	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	CCD	MARMOSAIC 325 mm CCD	flat collimating mirror double crystal monochromator toroid focusing mirror	2006-05-18	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL9-2	0.9795	SSRL	BL9-2

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	1.05	25.57	98	0.074	9.3	4.19	49888	49888			14.6

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)
	1.05	1.09	96.1		0.406	2.1	3.63	4842

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	ACORN (DDM)	THROUGHOUT	10-RESIDUE ALPHA-HELIX	1.05	24.75	49887	49887	2512	98.01	0.16	0.16	0.16	0.173	RANDOM	11.685

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]
-0.01		0.18	-0.05		0.07

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.839
r_dihedral_angle_4_deg	13.888
r_dihedral_angle_3_deg	12.453
r_sphericity_free	6.297
r_dihedral_angle_1_deg	5.588
r_scangle_it	4.358
r_scbond_it	3.399
r_sphericity_bonded	3.036
r_mcangle_it	2.161
r_rigid_bond_restr	1.815
r_mcbond_it	1.761
r_angle_refined_deg	1.39
r_angle_other_deg	0.893
r_mcbond_other	0.756
r_symmetry_vdw_refined	0.268
r_symmetry_vdw_other	0.255
r_nbd_refined	0.223
r_nbtor_refined	0.183
r_nbd_other	0.179
r_symmetry_hbond_refined	0.158
r_xyhbond_nbd_refined	0.146
r_nbtor_other	0.086
r_chiral_restr	0.084
r_bond_refined_d	0.011
r_gen_planes_refined	0.007
r_gen_planes_other	0.004
r_bond_other_d	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1275
Nucleic Acid Atoms
Solvent Atoms	154
Heterogen Atoms	10

Software

Software
Software Name	Purpose
d*TREK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
d*TREK	data reduction
ACORN	phasing