Experiment: 2IY3

Structure of the E. Coli Signal Regognition Particle

ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1JPN
experimental model	PDB	1QZW

Sample
SRP BOUND TO RIBOSOME

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	HOMEMADE PLUNGER
Cryogen Name	ETHANE
Sample Vitrification Details	PLUNGED INTO ETHANE

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	24382
Reported Resolution (Å)	16
Resolution Method
Other Details	THE COORDINATES BELOW ARE MADE UP FROM THE FOLLOWING COMPONENTS: FFH NG DOMAIN (RESIDUE 1-296), ORGANISM SCIENTIFIC: THERMUS AQUATICUS (PDB ENTRY 1JPN ...	THE COORDINATES BELOW ARE MADE UP FROM THE FOLLOWING COMPONENTS: FFH NG DOMAIN (RESIDUE 1-296), ORGANISM SCIENTIFIC: THERMUS AQUATICUS (PDB ENTRY 1JPN CHAIN A). FFH M DOMAIN (RESIDUE 297-432), ORANISM SCIENTIFIC: SULFOLOBUS SOLFATARICUS (PDB ENTRY 1QZW CHAIN A). 4.5S RNA (RESIDUE 33- 73), ORGANISM SCIENTIFIC: SULFOLOBUS SOLFATARICUS (PDB ENTRY 1QZW, CHAIN B). 4.5S RNA (RESIDUE 1-32 AND 74-110), ORGANISM SCIENTIFIC: ESCHERICHIA COLI (PDB: SRPDB, ROSENBLAD ET AL, NUCLEIC ACID RES 21, 363-364,12:2003.
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (1JPN, 1QZW)
Refinement Space	REAL
Refinement Protocol	OTHER
Refinement Target	Cross-correlation coefficient
Overall B Value
Fitting Procedure
Details	METHOD--LOCAL CORRELATION REFINEMENT PROTOCOL--X-RAY

Data Acquisition
Detector Type	KODAK SO-163 FILM
Electron Dose (electrons/Å**2)	10

Imaging Experiment	1
Date of Experiment	2005-06-02
Temperature (Kelvin)	77
Microscope Model	FEI TECNAI 20
Minimum Defocus (nm)	1000
Maximum Defocus (nm)	4500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification	50000
Calibrated Magnification	51000
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
MODEL FITTING	NOMAD
RECONSTRUCTION	SPIDER

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	PHASE FLIPPING