4E8T

Structure of Oceanobacillus iheyensis group II intron in the presence of K+, Ca2+ and an oligonucleotide fragment substrate (low energy dataset)

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3IGI	PDB ENTRY 3IGI

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7	303	100 mM potassium acetate, 100 mM potassium chloride, 100 mM calcium chloride, 50 mM HEPES sodium, pH 7.0, 5% PEG8000, VAPOR DIFFUSION, HANGING DROP, temperature 303K

Crystal Properties
Matthews coefficient	Solvent content
3.67	66.51

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 88.458	α = 90
b = 95.765	β = 90
c = 225.688	γ = 90

Symmetry
Space Group	P 21 21 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 315		2011-10-29	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-C	1.6083	APS	24-ID-C

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	3.34	48.612	99.9	0.085	13.4	6.6		27121

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	3.34	3.42	99.8		0.754	2	5

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-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 3IGI	3.34	48.61	27121	1444	99.89	0.19129	0.18901	0.23544	RANDOM	120.704

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]
0.85			-1.64		0.79

RMS Deviations
Key	Refinement Restraint Deviation
r_angle_refined_deg	2.302
r_chiral_restr	0.131
r_gen_planes_refined	0.01
r_bond_refined_d	0.006
r_bond_other_d
r_angle_other_deg
r_dihedral_angle_1_deg
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_gen_planes_other
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_it
r_mcbond_other
r_mcangle_it
r_scbond_it
r_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	8489
Solvent Atoms	40
Heterogen Atoms	111

Software

Software
Software Name	Purpose
PHASER	phasing
REFMAC	refinement
ADSC	data collection
XDS	data reduction
XSCALE	data scaling