3FTR

Structure of an amyloid forming peptide SSTNVG from IAPP (alternate polymorph)

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	298	reservoir contained 20% w/v PEG-3000, 0.1M HEPES, 0.2M NaCl, pH 7.5, vapor diffusion, hanging drop, temperature 298K

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 16.59	α = 90
b = 4.789	β = 90
c = 40.229	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		2008-11-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-E	0.9792	APS	24-ID-E

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	1.6	90	92.6	0.149	6.462	4.5		503			15.9

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)
	1.6	1.72	85.7		0.499		2.8	78

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	1.61	20.11	486	48	92.93	0.226	0.223	0.253	RANDOM	9.598

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			-1.31		0.34

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	41.332
r_dihedral_angle_3_deg	7.329
r_dihedral_angle_1_deg	4.121
r_mcangle_it	2.574
r_scangle_it	1.786
r_mcbond_it	1.74
r_scbond_it	1.272
r_angle_refined_deg	0.913
r_angle_other_deg	0.593
r_mcbond_other	0.407

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	41.332
r_dihedral_angle_3_deg	7.329
r_dihedral_angle_1_deg	4.121
r_mcangle_it	2.574
r_scangle_it	1.786
r_mcbond_it	1.74
r_scbond_it	1.272
r_angle_refined_deg	0.913
r_angle_other_deg	0.593
r_mcbond_other	0.407
r_chiral_restr	0.081
r_bond_other_d	0.007
r_bond_refined_d	0.004
r_gen_planes_refined	0.001
r_gen_planes_other

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	39
Nucleic Acid Atoms
Solvent Atoms	3
Heterogen Atoms

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection

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.