REL PDBe PDBe PDBe 2007-12-18 2008-01-18 2008-04-07 2011-05-26 Three-dimensional structure of vertebrate cardiac muscle myosin filaments. Zoghbi ME Woodhead JL Moss RL Craig R Zoghbi ME Woodhead JL Moss RL Craig R Three-dimensional structure of vertebrate cardiac muscle myosin filaments. PROC.NAT.ACAD.SCI.USA 105 2386 2390 2008 18252826 doi:10.1073/pnas.0708912105 Cardiac myosin filaments from mouse ventricle muscle Cardiac myosin filaments from mouse ventricle muscle 1 Myosin Mus musculus 129SVE mouse cardiac ventricle cytoplasm 0.52 0.52
Filament is a polymer of myosin
polymer false helical filament 7.2
100 mM NaCl, 2 mM EGTA, 5 mM MgCl2, 1 mM DTT, 10 mM Imidazole, 5 mM MgATP, 0.1 mM blebbistatin,pH 7.2
 NEGATIVE
A drop of filament suspension was placed on an electron microscope grid coated with a thin layer of carbon supported by a thicker holey carbon film. The grid was rinsed sequentially with 6 drops of relaxing rinse (in mM: 140 NaAc, 1 MgAc2, 1 EGTA, 5 Imidazole, 1 sodium azide, 1 MgATP, pH 7.0 ) and 5 drops of 2% uranyl acetate. Staining was carried out at room temperature with solutions pre-warmed to 37o C.
carbon holey grids (400 mesh copper)
 NONE FEI/PHILIPS CM120T FLOOD BEAM BRIGHT FIELD LAB6 80 2.0 0.9 1.1 42000.0 42000.0 OTHER corrected at 240,000 x
Grids were observed in a Philips CM120 electron microscope (FEI, Hillsboro, OR) under low dose conditions. Only filaments on thin carbon over holes were photographed .
2006-05-30 TVIPS TEMCAM-F224 (2k x 2k) 300
Images were acquired on a CDD camera at 5.7 A/pixel
8. Eucentric
The filament shows perturbations from a perfect helical structure.
C3 OTHER 32.0 FSC 0.5 CUT-OFF SPIDER
Since these filaments are not perfectly helical, we used single particle analysis for their reconstruction. Filaments were oriented vertically and the region between the 3rd and 10th 42.9 nm repeats from the bare zone (where MyBP-C is present) was computationally cut. Those selected filament regions were converted to SPIDER format (EM2EM; Image Science and Imperial College, London), and cut into segments 3x42.9 nm long in SPIDER (v11.2, Wadsworth Center, Albany, NY). Relative rotations of different filament segments were determined before back-projection by matching filament images against 2D projections of 3D models rotated around their long axis at known angles. C3 symmetry was imposed during reconstruction. A total of 2564 segments (2600 particles) were used for the reconstruction.
 emd_1465.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 66 153 70 0 0 0 153 66 70 872.1 376.2 399 90 90 90 X Y Z -1.04307 1.44742 -0.129344 0.384131 5.7 5.7 5.7 0.625 Reconstruction of cardiac myosin filaments (C-zone) under relaxing conditions. The reconstruction (filtered to 4.0 nm resolution) shows two 42.9 nm repeats. The main globular features are myosin heads, which are arranged in three crowns within each 42.9 nm repeat, following a perturbed helical path. Each crown has 3-fold rotational symmetry. Smaller features with a periodicity of about 4 nm can also be observed. Those features represent the accessory proteins titin and myosin-binding protein-C.
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 1I84 RIGID BODY FIT
Atomic structure of the myosin heads (pdb 1i84; with the modifications introduced by Woodhead et al., 2005. Nature. 436:1195)was fitted manually to the globular features of the reconstruction using UCSF Chimera.
emd_5911_1.tif
emd_5911.tif