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Open data
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Basic information
Entry | Database: PDB / ID: 1b7t | ||||||
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Title | MYOSIN DIGESTED BY PAPAIN | ||||||
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![]() | MYOSIN / MYOSIN MOTOR | ||||||
Function / homology | ![]() cytoskeletal motor regulator activity / mitotic actomyosin contractile ring / mitotic actomyosin contractile ring contraction / muscle myosin complex / myosin filament / actomyosin structure organization / locomotion / myosin II complex / microfilament motor activity / myofibril ...cytoskeletal motor regulator activity / mitotic actomyosin contractile ring / mitotic actomyosin contractile ring contraction / muscle myosin complex / myosin filament / actomyosin structure organization / locomotion / myosin II complex / microfilament motor activity / myofibril / sarcomere organization / myosin heavy chain binding / mitotic cytokinesis / post-embryonic development / muscle contraction / actin filament binding / calmodulin binding / calcium ion binding / ATP binding / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Houdusse, A. / Kalabokis, V. / Himmel, D. / Szent-Gyorgyi, A.G. / Cohen, C. | ||||||
![]() | ![]() Title: Atomic structure of scallop myosin subfragment S1 complexed with MgADP: a novel conformation of the myosin head. Authors: A Houdusse / V N Kalabokis / D Himmel / A G Szent-Györgyi / C Cohen / ![]() Abstract: The crystal structure of a proteolytic subfragment from scallop striated muscle myosin, complexed with MgADP, has been solved at 2.5 A resolution and reveals an unusual conformation of the myosin ...The crystal structure of a proteolytic subfragment from scallop striated muscle myosin, complexed with MgADP, has been solved at 2.5 A resolution and reveals an unusual conformation of the myosin head. The converter and the lever arm are in very different positions from those in either the pre-power stroke or near-rigor state structures; moreover, in contrast to these structures, the SH1 helix is seen to be unwound. Here we compare the overall organization of the myosin head in these three states and show how the conformation of three flexible "joints" produces rearrangements of the four major subdomains in the myosin head with different bound nucleotides. We believe that this novel structure represents one of the prehydrolysis ("ATP") states of the contractile cycle in which the myosin heads stay detached from actin. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 226.4 KB | Display | ![]() |
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PDB format | ![]() | 174.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 472.3 KB | Display | ![]() |
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Full document | ![]() | 530.7 KB | Display | |
Data in XML | ![]() | 28.5 KB | Display | |
Data in CIF | ![]() | 42.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
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Assembly
Deposited unit | ![]()
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Unit cell |
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Components
-Protein , 3 types, 3 molecules AYZ
#1: Protein | Mass: 95317.430 Da / Num. of mol.: 1 / Fragment: PAPAIN DIGESTED, SUBFRAGMENT 1 (S1) / Source method: isolated from a natural source / Details: PAPAIN DIGESTION OF MYOSIN / Source: (natural) ![]() |
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#2: Protein | Mass: 17560.855 Da / Num. of mol.: 1 / Fragment: PAPAIN DIGESTED, SUBFRAGMENT 1 (S1) / Source method: isolated from a natural source / Details: PAPAIN DIGESTION OF MYOSIN / Source: (natural) ![]() |
#3: Protein | Mass: 17635.635 Da / Num. of mol.: 1 / Fragment: PAPAIN DIGESTED, SUBFRAGMENT 1 (S1) / Source method: isolated from a natural source / Details: PAPAIN DIGESTION OF MYOSIN / Source: (natural) ![]() |
-Non-polymers , 4 types, 108 molecules ![](data/chem/img/MG.gif)
![](data/chem/img/ADP.gif)
![](data/chem/img/CA.gif)
![](data/chem/img/HOH.gif)
![](data/chem/img/ADP.gif)
![](data/chem/img/CA.gif)
![](data/chem/img/HOH.gif)
#4: Chemical | #5: Chemical | ChemComp-ADP / | #6: Chemical | ChemComp-CA / | #7: Water | ChemComp-HOH / | |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 3.11 Å3/Da / Density % sol: 64 % | ||||||||||||||||||||||||||||||||||||||||||
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Crystal grow | pH: 8 / Details: pH 8.0 | ||||||||||||||||||||||||||||||||||||||||||
Crystal | *PLUS Density % sol: 64.6 % | ||||||||||||||||||||||||||||||||||||||||||
Crystal grow | *PLUS Temperature: 4 ℃ / Method: vapor diffusion, sitting drop / Details: used to seeding | ||||||||||||||||||||||||||||||||||||||||||
Components of the solutions | *PLUS
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-Data collection
Diffraction | Mean temperature: 100 K |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Detector: CCD / Date: Jan 15, 1997 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.918 Å / Relative weight: 1 |
Reflection | Resolution: 2.5→40 Å / Num. obs: 43838 / % possible obs: 80.6 % / Redundancy: 3 % / Biso Wilson estimate: 50 Å2 / Rmerge(I) obs: 0.048 / Rsym value: 0.048 / Net I/σ(I): 11.6 |
Reflection shell | *PLUS Highest resolution: 2.5 Å / Lowest resolution: 2.8 Å / % possible obs: 38.5 % / Redundancy: 1.4 % / Num. unique obs: 5968 / Rmerge(I) obs: 0.11 / Mean I/σ(I) obs: 6 |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 1MMD, 1WDC Resolution: 2.5→30 Å / Isotropic thermal model: RESTRAINED / Cross valid method: THROUGHOUT / σ(F): 0
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Refine analyze |
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Refinement step | Cycle: LAST / Resolution: 2.5→30 Å
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Refine LS restraints |
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Xplor file | Serial no: 1 / Param file: PROTEIN_REP.PARAM / Topol file: TOPHCSDX.PRO | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Software | *PLUS Name: ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | *PLUS Highest resolution: 2.5 Å / Lowest resolution: 30 Å / σ(F): 0 / % reflection Rfree: 5 % / Rfactor obs: 0.2244 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Solvent computation | *PLUS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | *PLUS | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints | *PLUS
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