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Fully-loaded anthrax lethal toxin in its heptameric pre-pore state
Sample Components
Protective antigen
Lethal factor
Specimen Preparation
Sample Aggregation State
PARTICLE
Vitrification Instrument
GATAN CRYOPLUNGE 3
Cryogen Name
ETHANE
Sample Vitrification Details
4 uL sample was applied to grid (with 2 nm additional carbon layer) and incubated for 45 s prior blotting.
3D Reconstruction
Reconstruction Method
SINGLE PARTICLE
Number of Particles
210000
Reported Resolution (Å)
3.5
Resolution Method
FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type
POINT
Point Symmetry
C1
Map-Model Fitting and Refinement
Id
1 (3HVD, 1J7N)
Refinement Space
Refinement Protocol
FLEXIBLE FIT
Refinement Target
Overall B Value
Fitting Procedure
Details
The protective antigen (PA) monomer from 3HVD was placed seven times into the density corresponding to the heptameric PA ring using the rigid-body fit ...
The protective antigen (PA) monomer from 3HVD was placed seven times into the density corresponding to the heptameric PA ring using the rigid-body fit in Chimera. Two copies of the monomeric lethal factor (LF) from 1J7N were fitted similarly into the corresponding LF density located atop of the PA7 ring. The resulting model was then flexibly fitted using iMODFIT. The model was further refined in iterative rounds of phenix and coot. Unresolved regions were deleted and side chain information was removed for less well-defined regions.