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139555
Biological Macromolecular Structures Enabling Breakthroughs in Research and Education
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Structure Summary
3D View
Annotations
Sequence
Sequence Similarity
Structure Similarity
Experiment
1O1A
MOLECULAR MODELS OF AVERAGED RIGOR CROSSBRIDGES FROM TOMOGRAMS OF INSECT FLIGHT MUSCLE
Display Files
FASTA Sequence
PDB File
PDB File (Header)
mmCIF File
mmCIF File (Header)
PDBML/XML File
PDBML/XML File (Header)
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FASTA Sequence
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PDBx/mmCIF File (gz)
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PDBML/XML File (gz)
Biological Assembly (gz) (A)
ELECTRON MICROSCOPY Experimental Data
EM Sample
Sample Vitrification Details
NO VITRIFICATION. SAMPLES WERE VIEWED AT ROOM TEMPERATURE.
Sample Aggregation State
TISSUE
Sample Reconstruction Method
TOMOGRAPHY
Name of Sample
INSECT FLIGHT MUSCLE OF THE LARGE WATER BUG LETHOCERUS MAXIMUS
EM Data Acquisition
Date of Experiment
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Temperature (Kelvin)
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Microscope Model
FEI/PHILIPS EM400
Detector Type
KODAK SO-163 FILM
Minimum Defocus (nm)
--
Maximum Defocus (nm)
--
Minimum Tilt Angle (degrees)
--
Maximum Tilt Angle (degrees)
--
Nominal CS
--
Imaging Mode
BRIGHT FIELD
Electron Dose (electrons per Å**-2)
--
Illumination Mode
FLOOD BEAM
Nominal Magnification
17000
Calibrated Magnification
--
Source
TUNGSTEN HAIRPIN
Acceleration Voltage (kV)
100
Imaging Details
--
3D Reconstruction
Software Package(s)
Custom
Reconstruction Method(s)
--
EM Image Reconstruction Statistics
Number of Particles
--
Other Details
3-D MOTIFS WERE IDENTIFIED IN THE TOMOGRAM BY FIRST PRODUCING A CROSS CORRELATION MAP FROM WHICH PEAK COORDINATES WERE DETERMINED FROM THEIR CENTER OF GRAVITY. WE DEFINE A 3-D MOTIF AS ONE, ENTIRE 38.7 NM CROSSBRIDGE REPEAT ALONG ACTIN. THESE MOTIFS USUALLY CONTAIN AT LEAST FOUR MYOSIN HEADS IN TWO PAIRED CROSSBRIDGES (SINGLE CHEVRONS) AND SOMETIMES CONTAIN AS MANY AS SIX MYOSIN HEADS IN FOUR PAIRED CROSSBRIDGES (DOUBLE CHEVRONS). THE REFERENCE FOR THE ANALYSIS WAS SELECTED TO BE CENTERED BETWEEN SUCCESSIVE TROPONIN DENSITIES WHICH COULD BE IDENTIFIED FROM THE IN-PLANE PROJECTION. THE INDIVIDUAL CROSSBRIDGE MOTIFS WERE THEN SUBJECTED TO MULTIVARIATE STATISTICAL ANALYSIS TO IDENTIFY CLUSTERS OF MOTIFS SHOWING SIMILAR CROSSBRIDGE STRUCTURE. THESE CLUSTERS FORMED THE CLASS AVERAGES. THE CHOICE OF STRUCTURE TO BE CLASSIFIED WAS DECIDED BY THE RESOLUTION AND THE LATER PROCESS OF MODEL BUILDING. AVERAGING WAS DONE ACCORDING TO THE HEIRARCHICAL ASCENDENT METHOD. THE RESOLUTION IN EACH OF THE CLASS AVERAGES WAS 7 NM BY THE SPECTRAL SIGNAL TO NOISE RATIO.
Effective Resolution
70.0
EM Map-Model Fitting and Refinement
Refinement Space
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Fitting Software
REAL
RIGID BODY FIT
BEST CORRELATION COEFFICIENT AND FEWEST POOR CONTACTS
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