3JD6

Double octamer structure of retinoschisin, a cell-cell adhesion protein of the retina

ELECTRON MICROSCOPY

Sample
Purified Retinoschisin: residues 24-224 + 6xHis

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	LEICA EM GP
Cryogen Name	ETHANE
Sample Vitrification Details	Ambient temperature 23 degrees C. Plunged into liquid ethane (LEICA EM GP).

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	9096
Reported Resolution (Å)	4.1
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	D8

Map-Model Fitting and Refinement
Id	1 (1SDD)
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target	FSC(0.5) = 4.7
Overall B Value
Fitting Procedure
Details	METHOD--Flexible fitting REFINEMENT PROTOCOL--FLEXIBLE

Data Acquisition
Detector Type	GATAN K2 (4k x 4k)
Electron Dose (electrons/Å**2)	30

Imaging Experiment	1
Date of Experiment	2014-06-03
Temperature (Kelvin)
Microscope Model	FEI POLARA 300
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	OTHER
Nominal Magnification	39000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	10 frames over 3 seconds

EM Software
Task	Software Package	Version
MODEL FITTING	Coot
MODEL FITTING	Foldit
MODEL FITTING	MDFF
RECONSTRUCTION	EMAN	2
RECONSTRUCTION	RELION

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	Included in iterative refinement

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 R01GM133198.