1EL4

STRUCTURE OF THE CALCIUM-REGULATED PHOTOPROTEIN OBELIN DETERMINED BY SULFUR SAS

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6	277	HANGING DROP VAPOR DIFFUSION USING 5 MICROLITER DROPS CONTAINING EQUAL VOLUMES OF PROTEIN CONCENTRATE (10 MG/ML) AND RESERVOIR SOLUTION: CONTAINING 1.4 M SODIUM CITRATE, PH 6.0., VAPOR DIFFUSION, HANGING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
3.79	62

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 81.562	α = 90
b = 81.562	β = 90
c = 86.088	γ = 120

Symmetry
Space Group	P 62

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	MARRESEARCH		1999-09-18	M	SINGLE WAVELENGTH
2	1	100	CCD	APS-1		1999-06-10
3	1	100	CCD	ADSC QUANTUM 4		1999-04-05

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 17-ID		APS	17-ID
2	SYNCHROTRON	APS BEAMLINE 19-ID		APS	19-ID
3	SYNCHROTRON	ALS BEAMLINE 5.0.2		ALS	5.0.2

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	1.73	20	99.5	0.038	37.6	5.8	33058	33694	2	2	17.5

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)
	1.73	1.79	97.1		0.216		5	3274

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	SULFUR SAS	THROUGHOUT	1.73	19.84	33058	33058	2665	97.5	0.191	0.191	0.188	0.205	RANDOM	18.6

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]
0.87	0.98		0.87		-1.75

RMS Deviations
Key	Refinement Restraint Deviation
c_dihedral_angle_d	19.6
c_scangle_it	3.59
c_scbond_it	2.48
c_mcangle_it	1.84
c_mcbond_it	1.3
c_angle_deg	1.1
c_improper_angle_d	0.71
c_bond_d	0.005

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1556
Nucleic Acid Atoms
Solvent Atoms	266
Heterogen Atoms	34

Software

Software
Software Name	Purpose
SOLVE	phasing
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling
ISAS	phasing

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.