3JAM

CryoEM structure of 40S-eIF1A-eIF1 complex from yeast

ELECTRON MICROSCOPY

Sample
Initiation factors eIF1A and eIF1 bound to the 40S ribosome
Sample Components
Ribosome small subunit 40S
Eukaryotic initiation factor eIF1A
Eukaryotic initiation factor eIF1

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK I
Cryogen Name	ETHANE
Sample Vitrification Details	Blot for 2.5 to 3 seconds before plunging into liquid ethane (FEI VITROBOT MARK I).

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	86055
Reported Resolution (Å)	3.46
Resolution Method	FSC 0.143 CUT-OFF
Other Details	gold-standard
Refinement Type	HALF-MAPS REFINED INDEPENDENTLY
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (3J80)
Refinement Space	RECIPROCAL
Refinement Protocol	OTHER
Refinement Target	R-factor, FSC
Overall B Value	89
Fitting Procedure
Details	METHOD--Local refinement

Data Acquisition
Detector Type	FEI FALCON II (4k x 4k)
Electron Dose (electrons/Å**2)	27

Imaging Experiment	1
Date of Experiment	2014-04-28
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	1500
Maximum Defocus (nm)	4000
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification	78000
Calibrated Magnification	104478
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	Complete dataset was collected over two non-consecutive days.

EM Software
Task	Software Package	Version
MODEL FITTING	Coot
MODEL FITTING	REFMAC
MODEL FITTING	UCSF Chimera
RECONSTRUCTION	RELION

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.