6IAW

Structure of head fiber and inner core protein gp22 of native bacteriophage P68

ELECTRON MICROSCOPY

Sample
Staphylococcus phage P68

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	blot time 2s; blot force -2; 3.6 ul of sample

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	28826
Reported Resolution (Å)	3.8
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C5

Map-Model Fitting and Refinement
Id	1 (6IAT)
Refinement Space	REAL
Refinement Protocol	AB INITIO MODEL
Refinement Target
Overall B Value
Fitting Procedure
Details	The refinement was conducted on rigid body fitted major capsid proteins and Arstotzka proteins obtained from related structure of 6IAT; EMD-4438. The ...	The refinement was conducted on rigid body fitted major capsid proteins and Arstotzka proteins obtained from related structure of 6IAT; EMD-4438. The chains were fitted into hexon adjacent to portal of P68 capsid obtained from 5-fold symmetrized reconstruction. Subsequently, poly-alanine chains were manually built into densities corresponding to N-terminal part of head-fiber (chain IDs H,K,L) and C-terminal part of inner core protein (chain IDs X,Y,Z). The map was masked according to the related pdb in chimera, normalized and put into several rounds of a real space refinement in Phenix.

Data Acquisition
Detector Type	FEI FALCON II (4k x 4k)
Electron Dose (electrons/Å**2)	21

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	1
Maximum Defocus (nm)	3
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	75000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	EMAN2	2.1
IMAGE ACQUISITION	EPU
CTF CORRECTION	CTFFIND	4.0
MODEL FITTING	Coot	0.8.8
INITIAL EULER ASSIGNMENT	RELION	2.1
FINAL EULER ASSIGNMENT	RELION	2.1
CLASSIFICATION	RELION	2.1
RECONSTRUCTION	RELION	2.1
MODEL REFINEMENT	PHENIX	dev:3042

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		37218

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.