5NG5

multi-drug efflux; membrane transport; RND superfamily; Drug resistance

ELECTRON MICROSCOPY

Sample
AcrABTolC in apo state

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	a 3ul aliquot at a concentration of 2 mg per ml was applied onto glow-discharged holey carbon grid (Quantifoil Au R1.21.3, 300 mesh)

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	13544
Reported Resolution (Å)	6.5
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT

Map-Model Fitting and Refinement
Id	1
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target	Cross-correlation coefficient
Overall B Value
Fitting Procedure
Details	Crystal structures were rigid-body fit into the density map and model optimization was then carried out with Phenix real-space refine. Due to the weak ...	Crystal structures were rigid-body fit into the density map and model optimization was then carried out with Phenix real-space refine. Due to the weaker resolution, stronger stereochemical and secondary structure restraints were used to ensure that alpha-helices and beta-sheets did not deviate far from their expected geometry. Manual adjustments were kept to a minimum to reduce human bias in the modeling procedure, with Coot only being used to fix obvious errors such as C-beta deviations. A final check of MolProbity and cross correlation was done to ensure model quality.

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	1

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

EM Software
Task	Software Package	Version
CTF CORRECTION	CTFFIND	4
MODEL FITTING	UCSF Chimera
INITIAL EULER ASSIGNMENT	EMAN	2.2
FINAL EULER ASSIGNMENT	RELION	2
MODEL REFINEMENT	PHENIX
MODEL REFINEMENT	Coot

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING ONLY		95410	auto box by relion

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 R01GM157729.