7E70

Time-resolved serial femtosecond crystallography reveals early structural changes in channelrhodopsin: 250 microsecond structure

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	LIPIDIC CUBIC PHASE	6.9	293	100 mM MES, pH 6.9, 100 mM Na formate, and 30% PEG500DM

Crystal Properties
Matthews coefficient	Solvent content
2.62	53.07

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 61.8	α = 90
b = 142.2	β = 90
c = 94.7	γ = 90

Symmetry
Space Group	C 2 2 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	293	CCD	MPCCD		2016-10-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	FREE ELECTRON LASER	SACLA BEAMLINE BL3	1.77	SACLA	BL3

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	CC (Half)	R Split (All)	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	2.4	39.41	100	0.9812	0.132	4.87	110		16730

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	CC (Half)	R Split (All)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.4	2.441	100		0.4533	1.3786	0.77	22

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	3ug9	2.5	14.96	11384	584	80.79	0.4499	0.4467	0.5141	RANDOM	57.917

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]
0.68			-4		3.31

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.478
r_dihedral_angle_3_deg	19.918
r_dihedral_angle_4_deg	19.332
r_dihedral_angle_1_deg	5.574
r_angle_refined_deg	1.481
r_angle_other_deg	1.208
r_chiral_restr	0.063
r_bond_refined_d	0.01
r_gen_planes_refined	0.007
r_bond_other_d	0.003

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.478
r_dihedral_angle_3_deg	19.918
r_dihedral_angle_4_deg	19.332
r_dihedral_angle_1_deg	5.574
r_angle_refined_deg	1.481
r_angle_other_deg	1.208
r_chiral_restr	0.063
r_bond_refined_d	0.01
r_gen_planes_refined	0.007
r_bond_other_d	0.003
r_gen_planes_other	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2317
Nucleic Acid Atoms
Solvent Atoms	38
Heterogen Atoms	174

Software

Software
Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
CrystFEL	data reduction
CrystFEL	data scaling
PHASER	phasing

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.