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- PDB-8efd: Human cardiac myosin II and associated essential light chain in t... -

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Basic information

Entry
Database: PDB / ID: 8efd
TitleHuman cardiac myosin II and associated essential light chain in the rigor conformation
Components
  • Beta-cardiac myosin II
  • Myosin light chain 1/3, skeletal muscle isoform
KeywordsCONTRACTILE PROTEIN / actin / tropomyosin / myosin / cardiac
Function / homology
Function and homology information


Striated Muscle Contraction / regulation of slow-twitch skeletal muscle fiber contraction / regulation of the force of skeletal muscle contraction / contractile muscle fiber / muscle myosin complex / muscle filament sliding / regulation of the force of heart contraction / transition between fast and slow fiber / myosin filament / myosin II complex ...Striated Muscle Contraction / regulation of slow-twitch skeletal muscle fiber contraction / regulation of the force of skeletal muscle contraction / contractile muscle fiber / muscle myosin complex / muscle filament sliding / regulation of the force of heart contraction / transition between fast and slow fiber / myosin filament / myosin II complex / adult heart development / cardiac muscle hypertrophy in response to stress / myosin complex / structural constituent of muscle / sarcomere organization / microfilament motor activity / ventricular cardiac muscle tissue morphogenesis / myofibril / skeletal muscle contraction / striated muscle contraction / stress fiber / ATP metabolic process / cardiac muscle contraction / regulation of heart rate / sarcomere / muscle contraction / Z disc / actin filament binding / calmodulin binding / calcium ion binding / ATP binding / cytoplasm
Similarity search - Function
DNA repair protein XRCC4-like, C-terminal / Myosin tail / Myosin tail / Myosin N-terminal SH3-like domain / Myosin S1 fragment, N-terminal / Myosin, N-terminal, SH3-like / Myosin N-terminal SH3-like domain profile. / Short calmodulin-binding motif containing conserved Ile and Gln residues. / Myosin head, motor domain / Myosin head (motor domain) ...DNA repair protein XRCC4-like, C-terminal / Myosin tail / Myosin tail / Myosin N-terminal SH3-like domain / Myosin S1 fragment, N-terminal / Myosin, N-terminal, SH3-like / Myosin N-terminal SH3-like domain profile. / Short calmodulin-binding motif containing conserved Ile and Gln residues. / Myosin head, motor domain / Myosin head (motor domain) / Myosin motor domain profile. / Myosin. Large ATPases. / IQ motif profile. / IQ motif, EF-hand binding site / Kinesin motor domain superfamily / EF-hand calcium-binding domain profile. / EF-hand domain / EF-hand domain pair / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Myosin light chain 1/3, skeletal muscle isoform / Myosin-7
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsDoran, M.H. / Lehman, W. / Rynkiewicz, M.J.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R01HL036153 United States
CitationJournal: J Gen Physiol / Year: 2023
Title: Conformational changes linked to ADP release from human cardiac myosin bound to actin-tropomyosin.
Authors: Matthew H Doran / Michael J Rynkiewicz / David Rasicci / Skylar M L Bodt / Meaghan E Barry / Esther Bullitt / Christopher M Yengo / Jeffrey R Moore / William Lehman /
Abstract: Following binding to the thin filament, β-cardiac myosin couples ATP-hydrolysis to conformational rearrangements in the myosin motor that drive myofilament sliding and cardiac ventricular ...Following binding to the thin filament, β-cardiac myosin couples ATP-hydrolysis to conformational rearrangements in the myosin motor that drive myofilament sliding and cardiac ventricular contraction. However, key features of the cardiac-specific actin-myosin interaction remain uncertain, including the structural effect of ADP release from myosin, which is rate-limiting during force generation. In fact, ADP release slows under experimental load or in the intact heart due to the afterload, thereby adjusting cardiac muscle power output to meet physiological demands. To further elucidate the structural basis of this fundamental process, we used a combination of cryo-EM reconstruction methodologies to determine structures of the human cardiac actin-myosin-tropomyosin filament complex at better than 3.4 Å-resolution in the presence and in the absence of Mg2+·ADP. Focused refinements of the myosin motor head and its essential light chains in these reconstructions reveal that small changes in the nucleotide-binding site are coupled to significant rigid body movements of the myosin converter domain and a 16-degree lever arm swing. Our structures provide a mechanistic framework to understand the effect of ADP binding and release on human cardiac β-myosin, and offer insights into the force-sensing mechanism displayed by the cardiac myosin motor.
History
DepositionSep 8, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 11, 2023Provider: repository / Type: Initial release
Revision 1.1Jan 25, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Beta-cardiac myosin II
B: Myosin light chain 1/3, skeletal muscle isoform


Theoretical massNumber of molelcules
Total (without water)119,7782
Polymers119,7782
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Beta-cardiac myosin II / Myosin heavy chain 7 / Myosin heavy chain slow isoform / MyHC-slow / Myosin heavy chain / cardiac ...Myosin heavy chain 7 / Myosin heavy chain slow isoform / MyHC-slow / Myosin heavy chain / cardiac muscle beta isoform / MyHC-beta


Mass: 99157.695 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: MYH7, MYHCB / Cell line (production host): C2C12 / Production host: Mus musculus (house mouse) / References: UniProt: P12883
#2: Protein Myosin light chain 1/3, skeletal muscle isoform / MLC1/MLC3 / MLC1F/MLC3F / Myosin light chain alkali 1/2 / Myosin light chain A1/A2


Mass: 20620.490 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse) / Cell line: C2C12 / References: UniProt: P05977

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Complex of the human beta cardiac myosin II in the rigor form with the associated essential light chain.COMPLEXall0MULTIPLE SOURCES
2Human beta-cardiac myosin IICOMPLEX#11RECOMBINANT
3Mouse skeletal essential light chainCOMPLEX#21NATURAL
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-IDCell
22Homo sapiens (human)9606
33Mus musculus (house mouse)10090C2C12
Source (recombinant)Organism: Mus musculus (house mouse) / Cell: C2C12
Buffer solutionpH: 7
SpecimenConc.: 0.13 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: This complex was part of a larger filament containing actin-tropomyosin. The map was a result of a focused single particle approach.
Specimen supportDetails: 15 mA was used in the Pelco Easiglow glow discharge machine
Grid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 283 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELDBright-field microscopy / Calibrated magnification: 80000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 700 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 3.12 sec. / Electron dose: 53.7 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 4 / Num. of real images: 3961
EM imaging opticsEnergyfilter name: In-column Omega Filter / Energyfilter slit width: 20 eV
Image scansMovie frames/image: 35 / Used frames/image: 1-35

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Processing

SoftwareName: PHENIX / Version: 1.19.1_4122: / Classification: refinement
EM software
IDNameVersionCategory
1RELION3.1.1particle selection
2Leginonimage acquisition
4CTFFIND4.1CTF correction
7PHENIXmodel fitting
9PHENIXmodel refinement
10RELION3.1.1initial Euler assignment
11RELION3.1.1final Euler assignment
12RELION3.1.1classification
13RELION3.1.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 176178
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 88048 / Symmetry type: POINT
Atomic model buildingProtocol: OTHER / Space: REAL
Atomic model buildingPDB-ID: 6X5Z

6x5z

Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0027330
ELECTRON MICROSCOPYf_angle_d0.4599866
ELECTRON MICROSCOPYf_dihedral_angle_d3.486965
ELECTRON MICROSCOPYf_chiral_restr0.0371071
ELECTRON MICROSCOPYf_plane_restr0.0021283

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