1EC5

CRYSTAL STRUCTURE OF FOUR-HELIX BUNDLE MODEL

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	4.6	277	CRYSTALS WERE GROWN FROM AN AMMONIUM SULFATE 2M SOLUTION, pH 4.6, VAPOR DIFFUSION, HANGING DROP

Crystal Properties
Matthews coefficient	Solvent content
1.82	32

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 36.07	α = 90
b = 89.16	β = 90
c = 79.89	γ = 90

Symmetry
Space Group	C 2 2 21

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	MIRROR	1999-02-09	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ELETTRA BEAMLINE 5.2R		ELETTRA	5.2R

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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	2.5	17.4	96.2	0.107	10.7	11.7	5.2		23396		4	47

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
	2.5	2.64	96.7		0.48	48	2.7	5.2

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	THEORETICAL MODEL	2.5	15	4474	204	95.48	0.237	0.304	RANDOM	41.4

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	54.8
p_staggered_tor	29.6
p_planar_tor	3.7
p_scangle_it	1.871
p_mcangle_it	1.84
p_scbond_it	1.289
p_mcbond_it	1.086
p_multtor_nbd	0.298
p_xyhbond_nbd	0.231
p_singtor_nbd	0.215
p_hb_or_metal_coord	0.114
p_angle_d	0.036
p_planar_d	0.036
p_bond_d	0.009
p_angle_deg
p_plane_restr
p_chiral_restr
p_xhyhbond_nbd
p_orthonormal_tor
p_special_tor

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1248
Nucleic Acid Atoms
Solvent Atoms	32
Heterogen Atoms	3

Software

Software
Software Name	Purpose
AMoRE	phasing
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling