9RKP

Crystal structure of the coiled-coil based fibril core of the tardigrade CAHS-8 protein

Experimental procedure

Experimental method	SINGLE WAVELENGTH
Source type	SYNCHROTRON
Source details	ESRF BEAMLINE ID23-2
Synchrotron site	ESRF
Beamline	ID23-2
Temperature [K]	100
Detector technology	PIXEL
Collection date	2022-09-22
Detector	DECTRIS PILATUS3 2M
Wavelength(s)	0.87313
Spacegroup name	C 1 2 1
Unit cell lengths	61.830, 55.450, 96.380
Unit cell angles	90.00, 103.85, 90.00

Refinement procedure

Resolution	46.790 - 2.600
R-factor	0.2519
Rwork	0.250
R-free	0.28890
Structure solution method	MOLECULAR REPLACEMENT
RMSD bond length	0.012
RMSD bond angle	0.878
Data reduction software	XDS
Data scaling software	XSCALE
Phasing software	Arcimboldo
Refinement software	PHENIX (1.20.1_4487)

Data quality characteristics

	Overall	Outer shell
Low resolution limit [Å]	46.790	2.677
High resolution limit [Å]	2.600	2.600
Number of reflections	9589	747
<I/σ(I)>	3.87	1.21
Completeness [%]	96.5	95.03
Redundancy	5.7	5.7
CC(1/2)	0.969	0.279

Crystallization Conditions

crystal ID	method	pH	temperature	details
1	VAPOR DIFFUSION, HANGING DROP	6.5	298	Microcrystals were obtained by mixing the protein at 5 mg/mL in a 1:1 ratio to a solution of 0.1 M MES/Imidazole at pH = 6.5, 0.02M Sodium formate, 0.02M Ammonium acetate, 0.02M Sodium citrate tribasic dihydrate, 0.02M Potassium sodium tartrate tetrahydrate, 0.02M Sodium oxamate, 20% v/v Glycerol, 10% w/v PEG 4000