Experiment: 2QBY

Crystal structure of a heterodimer of Cdc6/Orc1 initiators bound to origin DNA (from S. solfataricus)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1FNN	PDB entry 1FNN

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	MICROBATCH	5	292	25mM HEPES pH 7.5, 50mM sodium chloride, 5% glycerol, 0.5mM TCEP, 15mM spermidine, 15mM sodium cacodylate pH 5.0, 4.4% (w/v) PEG 3350 and 25mM potassium thiocyanate, microbatch, temperature 292K

Crystal Properties
Matthews coefficient	Solvent content
3.81	67.68

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 77.649	α = 90
b = 199.143	β = 90
c = 213.405	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	CCD	ADSC QUANTUM 210		2006-04-20	M	MAD

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ALS BEAMLINE 8.3.1	1.11111, 0.979578, 0.979733, 0.987379	ALS	8.3.1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	3.35	50	98.7	25.4	6.9	24607	24287	2	2	119

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)
	3.35	3.47	99		0.835	1.93	5.6	2385

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MAD	THROUGHOUT	PDB entry 1FNN	3.35	30	2	2	23763	22548	1215	98	0.2262	0.2262	0.2202	0.2692	0.2615	random

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
f_angle_deg	0.837
f_bond_d	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5881
Nucleic Acid Atoms	1347
Solvent Atoms	4
Heterogen Atoms	77

Software

Software
Software Name	Purpose
HKL-2000	data collection
MLPHARE	phasing
PHENIX	refinement
HKL-2000	data reduction
SCALEPACK	data scaling