5KO0

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

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	ELECTRON MICROSCOPE
Source details	TECNAI F20 TEM
Temperature [K]	100
Detector technology	CMOS
Collection date	2014-11-04
Detector	TVIPS F416 CMOS CAMERA
Wavelength(s)	0.0251
Spacegroup name	P 1
Unit cell lengths	11.680, 18.180, 19.930
Unit cell angles	62.84, 88.90, 87.60

Refinement procedure

Resolution	9.749 - 1.400
R-factor	0.2287
Rwork	0.225
R-free	0.25900
Structure solution method	MOLECULAR REPLACEMENT
RMSD bond length	0.008
RMSD bond angle	1.216
Data scaling software	XSCALE
Phasing software	PHASER (2.5.6)
Refinement software	PHENIX

Data quality characteristics

	Overall	Inner shell	Outer shell
Low resolution limit [Å]	17.733	17.733	1.440
High resolution limit [Å]	1.400	6.260	1.400
Rmerge	0.193	0.140	0.505
Rmeas	0.215	0.158	0.648
Total number of observations	9014
Number of reflections	2180	23	84
<I/σ(I)>	4.33	8.3	1.1
Completeness [%]	75.0	71.9	35.3
CC(1/2)	0.985	0.984

Crystallization Conditions

crystal 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.