5KO0

Human Islet Amyloid Polypeptide Segment 15-FLVHSSNNFGA-25 Determined by MicroED

ELECTRON CRYSTALLOGRAPHY

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP		277	2 uL 20 mg/mL FLVHSSNNFGA + 1 uL 35% MPD, 0.35 M sodium thiocyanate against a reservoir of 35% MPD, 0.35 M sodium thiocyanate. Crystals appeared within several hours.

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 11.68	α = 62.84
b = 18.18	β = 88.9
c = 19.93	γ = 87.6

Symmetry
Space Group	P 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	electron	100	CMOS	TVIPS F416 CMOS CAMERA		2014-11-04	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ELECTRON MICROSCOPE	TECNAI F20 TEM	0.0251

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	CC (Half)	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	1.4	17.733	75	0.193	0.215	0.985	4.33			2180		-3	7.76

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.4	1.44	35.3		0.505	0.648	1.1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
ELECTRON CRYSTALLOGRAPHY	MOLECULAR REPLACEMENT	NONE	1.4	9.749	2.01	2177	218	75.56	0.2287	0.2247	0.259	9.0302

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]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	12.17
f_angle_d	1.216
f_chiral_restr	0.047
f_bond_d	0.008
f_plane_restr	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	170
Nucleic Acid Atoms
Solvent Atoms	6
Heterogen Atoms	3

Software

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

Sample
Amyloid fiber

Specimen Preparation
Sample Aggregation State	3D ARRAY
Vitrification Instrument
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	CRYSTALLOGRAPHY
Number of Particles
Reported Resolution (Å)	1.4
Resolution Method	DIFFRACTION PATTERN/LAYERLINES
Other Details
Refinement Type
Symmetry Type	3D CRYSTAL
Space Group Name
Length a	11.68
Length b	18.18
Length c	18.18
Angle Alpha	87.6
Angle Beta	88.9
Angle Gamma	87.6

Map-Model Fitting and Refinement
Id	1
Refinement Space	RECIPROCAL
Refinement Protocol	OTHER
Refinement Target	maximum likelihood
Overall B Value	9.03
Fitting Procedure
Details

Data Acquisition
Detector Type	TVIPS TEMCAM-F416 (4k x 4k)
Electron Dose (electrons/Å**2)	0.01

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TECNAI 20
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	DIFFRACTION
Specimen Holder Model	GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
IMAGE ACQUISITION	EM-Menu
DIFFRACTION INDEXING	XDS
MODEL FITTING	Coot	0.8.2
MOLECULAR REPLACEMENT	Phaser	2.5.6
MODEL REFINEMENT	PHENIX	1.9

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
NONE

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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.