REL RCSB RCSB RCSB 2015-07-02 2015-08-19 2015-10-07 2015-11-04 3D-Structure of negatively stained Schistosome myosin filament obtained by low-dose electron microscopy Sulbaran G Alamo L Pinto A Marquez G Mendez F Padron R Craig R Schistosoma mansoni, rigid docking, single particle reconstruction, Iterative Helical Real Space Reconstruction (IHRSR), negative stain, thick filament, smooth muscle Sulbaran G Alamo L Pinto A Marquez G Mendez F Padron R Craig R An invertebrate smooth muscle with striated muscle myosin filaments. PROC.NAT.ACAD.SCI.USA 112 e5660 e5668 2015 26443857 doi:10.1073/pnas.1513439112 Sulbaran G Alamo L Pinto A Marquez G Mendez F Padron R Craig R Schistosome Muscles Contain Striated Muscle-Like Myosin Filaments in a Smooth Muscle-Like Architecture BIOPHYS.J. 106 195 2014 3jax FULLOVERLAP Myosin thick filaments from Schistosoma mansoni smooth muscle Myosin thick filaments from Schistosoma mansoni smooth muscle
S. mansoni relaxed myosin thick filaments were isolated by permeabilizing and homogenizing whole animals in relaxing solution, centrifuged, and resuspended in blebbistatin.
polymer of myosin II molecules helically assembled over a paramyosin core 1 Myosin II Schistosoma mansoni JL Blood fluke smooth muscle myosin thick filament sarcomere
Myosin II is a protein complex formed by two heavy chains and two associated light chains (for each myosin head), plus additional proteins such as paramyosin. Using ATP hydrolysis, myosin functions as a molecular motor, producing movement by causing actin filaments to slide.
1 polymer of myosin II molecules helically assembled over a paramyosin core false Q02456 GO:0016459 GO:0003774 GO:0005524 IPR004009 IPR027417 IPR001609 IPR027401 IPR002928 IPR000048 helical filament 7.0
100 mM NaCl, 3 mM MgCl2, 1 mM EGTA, 5 mM PIPES, 1mM NaN3, 5 mM MgATP, 0.01 mM blebbistatin, protease inhibitor cocktail (Sigma P-8465)
 NEGATIVE
One drop of filament suspension was placed on grids and negatively stained with 1% uranyl acetate.
400-mesh holey carbon grids. Specimens were imaged on thin carbon extending over the holes.
 NONE OTHER FEI/PHILIPS CM120T FLOOD BEAM BRIGHT FIELD LAB6 80 2.0 0.6 2.4 42000.0 42000.0 SIDE ENTRY, EUCENTRIC Objective lens astigmatism was corrected at 240,000 times magnification
1.5 post-magnification, low-dose conditions
2013-03-01 TVIPS TEMCAM-F224 (2k x 2k) 263 10
Images were acquired with a 2K x 2K CCD TVIPS camera model F224HD at 5.7 A/pixel.
16. Room temperature holder
820 thick filament halves were selected from micrographs and stored in SPIDER format. 131 x 131 pixel segments were cut from these filaments, corresponding to a window of 74.7 nm (~five 14.5 nm-spaced crowns of heads).
145 30 C4 OTHER 23.0 OTHER SPIDER, EMAN2
For each iteration of reconstruction (30 cycles), filament segment projections were compared with different projections of the reference reconstruction as follows: seven 2.3 nm axial shifts, 2 degree intervals of rotation about the filament axis up to 90 degrees, and 2 degree intervals of out-of-plane tilting from -10 degrees to +10 degrees. The total number of projections was 7 x 45 x 11 = 3465. For the final 19 cycles of the reconstruction, we used only the best-ordered 420 filament halves (those in which >30% of the segments were found good enough to be used by the reconstruction script in the back-projection in previous cycles). From ~17,000 segments, ~9,500 (56%) were included in the final reconstruction. This final 3D-reconstruction was the average of the last 19 reconstructions between cycles 12 - 30. Its resolution, according to the 0.5 Fourier Shell Correlation (FSC) criterion, was 2.3 nm.
 emd_6370.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 131 131 131 -65 -65 0 131 131 131 746.69995 746.69995 746.69995 90.0 90.0 90.0 X Y Z -0.16773927 36.991428380000002 1.01146114 3.85783195 5.7 5.7 5.7 6.0 AUTHOR Map of Schistosome thick filaments. Initial view is from the Z-line perspective. If the map is rotated by 90 degrees in x direction, the J motif of the interacting heads is featured and the backbone subfilaments can be seen clearly.
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 3DTP A B C D E F RIGID BODY FIT Chimera
3DTP was fitted as a rigid body using the "Fit in Map" tool of UCSF Chimera.
REAL
emd_6370.tif
emd_6370_1.tif
emd_6370_2.tif
emd_6370_fsc.xml