2ONW

Structure of SSTSSA, a fibril forming peptide from Bovine Pancreatic Ribonuclease (RNase A, residues 15-20)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	291	Peptide concentration: 30 mg/ml, Reservoir: 0.1M HEPES-Na, pH 7.5, 10% v/v isopropanol, 20% PEG4000, VAPOR DIFFUSION, HANGING DROP, temperature 291K

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 42.008	α = 90
b = 4.83	β = 90
c = 12.888	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	MARRESEARCH		2005-01-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID13		ESRF	ID13

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	1.5	80	89.3	0.174	3.9			474			6.599

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)
	1.5	1.62	93.3		0.434			98

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	5 residue beta strand SSTSA with the C-terminal alanine absent	1.51	21	458	21	87.57	0.159	0.157	0.219	RANDOM	5.291

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]
-0.97			-0.02		0.99

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_3_deg	5.467
r_dihedral_angle_1_deg	5.242
r_angle_refined_deg	1.087
r_sphericity_bonded	0.714
r_angle_other_deg	0.693
r_mcangle_it	0.615
r_mcbond_it	0.488
r_rigid_bond_restr	0.409
r_sphericity_free	0.344
r_symmetry_vdw_other	0.307
r_scbond_it	0.243
r_nbd_other	0.207
r_mcbond_other	0.164
r_scangle_it	0.137
r_nbtor_refined	0.122
r_nbtor_other	0.093
r_chiral_restr	0.064
r_symmetry_hbond_refined	0.06
r_symmetry_vdw_refined	0.053
r_bond_refined_d	0.004
r_bond_other_d	0.001
r_gen_planes_refined	0.001
r_gen_planes_other

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	70
Nucleic Acid Atoms
Solvent Atoms	3
Heterogen Atoms

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
X-PLOR	phasing