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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.