7Q4E

Local refinement structure of a single N-domain of full-length, dimeric, soluble somatic angiotensin I-converting enzyme

ELECTRON MICROSCOPY

Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	13.446
f_angle_d	0.8436
f_chiral_restr	0.0471
f_plane_restr	0.0144
f_bond_d	0.0075

Sample
Full-length, soluble, dimeric somatic angiotensin I-converting enzyme

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	Diluted protein (in buffer containing zinc chloride and sodium chloride) was incubated on ice for 30 minutes after which it was applied to the grid, i ...	Diluted protein (in buffer containing zinc chloride and sodium chloride) was incubated on ice for 30 minutes after which it was applied to the grid, incubated for 30 seconds, and blotted for 3 seconds before plunging

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	215632
Reported Resolution (Å)	3.63
Resolution Method	FSC 0.143 CUT-OFF
Other Details	Local refinement (C1) with a mask around a single N-domain following C-domain particle subtraction in RELION, C2 symmetry expansion in cryoSPARC, and ...	Local refinement (C1) with a mask around a single N-domain following C-domain particle subtraction in RELION, C2 symmetry expansion in cryoSPARC, and local refinement of the two interacting N-domains
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target	Correlation coefficient
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K3 (6k x 4k)
Electron Dose (electrons/Å**2)	43

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	1800
Maximum Defocus (nm)	3000
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification	81000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	Topaz	0.2.5
IMAGE ACQUISITION	EPU
CTF CORRECTION	cryoSPARC	3.2
MODEL FITTING	ISOLDE	1.2.0
MODEL REFINEMENT	PHENIX	1.19.2
INITIAL EULER ASSIGNMENT	cryoSPARC	3.2
FINAL EULER ASSIGNMENT	cryoSPARC	3.2
CLASSIFICATION	cryoSPARC	3.2
RECONSTRUCTION	cryoSPARC	3.2

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION	cryoSPARC patch-based CTF estimation	1727045	Topaz-denoising was performed on all curated micrographs, a Topaz model trained on this dataset, and used for picking

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.