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- PDB-6c1g: High-Resolution Cryo-EM Structures of Actin-bound Myosin States R... -
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Basic information
Entry | Database: PDB / ID: 6c1g | ||||||
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Title | High-Resolution Cryo-EM Structures of Actin-bound Myosin States Reveal the Mechanism of Myosin Force Sensing | ||||||
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![]() | STRUCTURAL PROTEIN / Mechanochemistry / Mechanobiology / Structural Biology / Cytoskeleton / Molecular Motor / Myosin-I | ||||||
Function / homology | ![]() post-Golgi vesicle-mediated transport / transferrin transport / actin filament-based movement / myosin complex / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / Reduction of cytosolic Ca++ levels / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde ...post-Golgi vesicle-mediated transport / transferrin transport / actin filament-based movement / myosin complex / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / Reduction of cytosolic Ca++ levels / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Activation of Ca-permeable Kainate Receptor / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / PKA activation / negative regulation of high voltage-gated calcium channel activity / cytoskeletal motor activator activity / CaMK IV-mediated phosphorylation of CREB / Glycogen breakdown (glycogenolysis) / positive regulation of cyclic-nucleotide phosphodiesterase activity / organelle localization by membrane tethering / negative regulation of calcium ion export across plasma membrane / CLEC7A (Dectin-1) induces NFAT activation / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / microfilament motor activity / regulation of cardiac muscle cell action potential / Activation of RAC1 downstream of NMDARs / tropomyosin binding / positive regulation of ryanodine-sensitive calcium-release channel activity / mesenchyme migration / regulation of cell communication by electrical coupling involved in cardiac conduction / Negative regulation of NMDA receptor-mediated neuronal transmission / negative regulation of peptidyl-threonine phosphorylation / troponin I binding / Synthesis of IP3 and IP4 in the cytosol / Unblocking of NMDA receptors, glutamate binding and activation / myosin heavy chain binding / Phase 0 - rapid depolarisation / negative regulation of ryanodine-sensitive calcium-release channel activity / protein phosphatase activator activity / filamentous actin / actin filament bundle / RHO GTPases activate PAKs / cytoskeletal motor activity / brush border / phosphatidylinositol-3,4,5-trisphosphate binding / : / Ion transport by P-type ATPases / skeletal muscle thin filament assembly / microvillus / striated muscle thin filament / actin filament bundle assembly / Long-term potentiation / Uptake and function of anthrax toxins / Regulation of MECP2 expression and activity / Calcineurin activates NFAT / skeletal muscle myofibril / catalytic complex / DARPP-32 events / actin monomer binding / detection of calcium ion / regulation of cardiac muscle contraction / regulation of ryanodine-sensitive calcium-release channel activity / Smooth Muscle Contraction / cellular response to interferon-beta / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / calcium channel inhibitor activity / Protein methylation / eNOS activation / skeletal muscle fiber development / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / Activation of AMPK downstream of NMDARs / stress fiber / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / : / Ion homeostasis / titin binding / regulation of calcium-mediated signaling / positive regulation of protein autophosphorylation / voltage-gated potassium channel complex / sperm midpiece / calcium channel complex / phosphatidylinositol-4,5-bisphosphate binding / substantia nigra development / adenylate cyclase activator activity / Ras activation upon Ca2+ influx through NMDA receptor / regulation of heart rate / actin filament polymerization / sarcomere / FCERI mediated Ca+2 mobilization / protein serine/threonine kinase activator activity / FCGR3A-mediated IL10 synthesis / VEGFR2 mediated vascular permeability / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / VEGFR2 mediated cell proliferation / regulation of cytokinesis / trans-Golgi network membrane / positive regulation of peptidyl-threonine phosphorylation / filopodium Similarity search - Function | ||||||
Biological species | ![]() ![]() unidentified (others) ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.8 Å | ||||||
![]() | Mentes, A. / Huehn, A. / Liu, X. / Zwolak, A. / Dominguez, R. / Shuman, H. / Ostap, E.M. / Sindelar, C.V. | ||||||
Funding support | ![]()
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![]() | ![]() Title: High-resolution cryo-EM structures of actin-bound myosin states reveal the mechanism of myosin force sensing. Authors: Ahmet Mentes / Andrew Huehn / Xueqi Liu / Adam Zwolak / Roberto Dominguez / Henry Shuman / E Michael Ostap / Charles V Sindelar / ![]() Abstract: Myosins adjust their power outputs in response to mechanical loads in an isoform-dependent manner, resulting in their ability to dynamically adapt to a range of motile challenges. Here, we reveal the ...Myosins adjust their power outputs in response to mechanical loads in an isoform-dependent manner, resulting in their ability to dynamically adapt to a range of motile challenges. Here, we reveal the structural basis for force-sensing based on near-atomic resolution structures of one rigor and two ADP-bound states of myosin-IB (myo1b) bound to actin, determined by cryo-electron microscopy. The two ADP-bound states are separated by a 25° rotation of the lever. The lever of the first ADP state is rotated toward the pointed end of the actin filament and forms a previously unidentified interface with the N-terminal subdomain, which constitutes the upper half of the nucleotide-binding cleft. This pointed-end orientation of the lever blocks ADP release by preventing the N-terminal subdomain from the pivoting required to open the nucleotide binding site, thus revealing how myo1b is inhibited by mechanical loads that restrain lever rotation. The lever of the second ADP state adopts a rigor-like orientation, stabilized by class-specific elements of myo1b. We identify a role for this conformation as an intermediate in the ADP release pathway. Moreover, comparison of our structures with other myosins reveals structural diversity in the actomyosin binding site, and we reveal the high-resolution structure of actin-bound phalloidin, a potent stabilizer of filamentous actin. These results provide a framework to understand the spectrum of force-sensing capacities among the myosin superfamily. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 468.8 KB | Display | ![]() |
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PDB format | ![]() | 380.5 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 7330MC ![]() 7329C ![]() 7331C ![]() 5v7xC ![]() 6c1dC ![]() 6c1hC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 84143.930 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() | ||||
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#2: Protein | Mass: 16721.350 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) unidentified (others) / References: UniProt: P0DP23*PLUS | ||||
#3: Protein | Mass: 41862.613 Da / Num. of mol.: 5 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #4: Chemical | ChemComp-MG / #5: Chemical | ChemComp-ADP / |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: HELICAL ARRAY / 3D reconstruction method: helical reconstruction |
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Sample preparation
Component | Name: Complex of actin, myosin-1b, and calmodulin with ADP / Type: COMPLEX / Entity ID: #1-#3 / Source: MULTIPLE SOURCES |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: unidentified (others) |
Buffer solution | pH: 7 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Average exposure time: 11 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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Helical symmerty | Angular rotation/subunit: -167.4 ° / Axial rise/subunit: 27.5 Å / Axial symmetry: C1 |
3D reconstruction | Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 7700 Details: Resolution estimated by post-processing in RELION using a mask with soft edges that included only the central subunit. Symmetry type: HELICAL |
Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL |