Experiment: 4EJF

Allosteric peptides that bind to a caspase zymogen and mediate caspase tetramerization

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	3NR2	PDB ENTRY 3NR2

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.9	292.15	20% (w/v) PEG3350, 0.2 M NaThiocyanate pH 6.9, VAPOR DIFFUSION, HANGING DROP, temperature 292.15K

Crystal Properties
Matthews coefficient	Solvent content
2.18	43.51

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 128.299	α = 90
b = 105.692	β = 106.61
c = 91.924	γ = 90

Symmetry
Space Group	C 1 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	80	CCD	ADSC QUANTUM 315r		2009-08-05	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL7-1	0.979	SSRL	BL7-1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.64	80.148	99.7	0.086	11.1	3.7	34281	34281			35.28

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)
1	2.64	2.79	99.8		0.456	0.456	1.7	3.8	4993

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	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)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	PDB ENTRY 3NR2	2.6465	58.933	1.35	34192	1718	99.43	0.1907	0.1882	0.1931	0.2391	0.2389	44.3314

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]
-9.5681		6.5607	-2.8825		12.4506

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	14.343
f_angle_d	0.726
f_chiral_restr	0.049
f_bond_d	0.003
f_plane_restr	0.003

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	8196
Nucleic Acid Atoms
Solvent Atoms	279
Heterogen Atoms	10

Software

Software
Software Name	Purpose
SCALA	data scaling
PHASER	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction
XSCALE	data scaling