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- PDB-6bih: The Structure of the Actin-Smooth Muscle Myosin Motor Domain Comp... -

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Basic information

Entry
Database: PDB / ID: 6bih
TitleThe Structure of the Actin-Smooth Muscle Myosin Motor Domain Complex in the Rigor State
Components
  • Actin, alpha skeletal muscle
  • Myosin-11
KeywordsMOTOR PROTEIN / ADP-F-actin / apo-myosin / helix muscle
Function / homology
Function and homology information


myofibril assembly / elastic fiber assembly / myosin light chain binding / skeletal muscle myosin thick filament assembly / myosin II binding / muscle myosin complex / myosin filament / actomyosin structure organization / myosin II complex / cardiac muscle cell development ...myofibril assembly / elastic fiber assembly / myosin light chain binding / skeletal muscle myosin thick filament assembly / myosin II binding / muscle myosin complex / myosin filament / actomyosin structure organization / myosin II complex / cardiac muscle cell development / structural constituent of muscle / cytoskeletal motor activator activity / microfilament motor activity / myofibril / tropomyosin binding / myosin heavy chain binding / mesenchyme migration / troponin I binding / filamentous actin / actin filament bundle / skeletal muscle thin filament assembly / actin filament bundle assembly / striated muscle thin filament / skeletal muscle myofibril / actin monomer binding / smooth muscle contraction / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / filopodium / actin filament / ADP binding / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / calcium-dependent protein binding / actin filament binding / lamellipodium / actin binding / cell body / calmodulin binding / hydrolase activity / protein domain specific binding / calcium ion binding / positive regulation of gene expression / magnesium ion binding / ATP binding / identical protein 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. / IQ motif, EF-hand binding site / 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. / IQ motif, EF-hand binding site / Myosin head, motor domain / Myosin head (motor domain) / Myosin motor domain profile. / Myosin. Large ATPases. / IQ motif profile. / Kinesin motor domain superfamily / Actins signature 1. / Actin, conserved site / Actins signature 2. / Actin/actin-like conserved site / Actins and actin-related proteins signature. / Actin / Actin family / Actin / ATPase, nucleotide binding domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / Myosin-11 / Actin, alpha skeletal muscle
Similarity search - Component
Biological speciesGallus gallus (chicken)
Oryctolagus cuniculus (rabbit)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 6 Å
AuthorsTaylor, K.A. / Banerjee, C. / Hu, Z.
Funding support United States, 6items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM30598 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)P01 HL110869 United States
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)R01 AR53975 United States
American Heart Association15PRE25090150 United States
National Institutes of Health/National Center for Research Resources (NIH/NCRR)S10 RR25080 United States
National Institutes of Health/Office of the DirectorS10 OD018142 United States
CitationJournal: J Struct Biol / Year: 2017
Title: The structure of the actin-smooth muscle myosin motor domain complex in the rigor state.
Authors: Chaity Banerjee / Zhongjun Hu / Zhong Huang / J Anthony Warrington / Dianne W Taylor / Kathleen M Trybus / Susan Lowey / Kenneth A Taylor /
Abstract: Myosin-based motility utilizes catalysis of ATP to drive the relative sliding of F-actin and myosin. The earliest detailed model based on cryo-electron microscopy (cryoEM) and X-ray crystallography ...Myosin-based motility utilizes catalysis of ATP to drive the relative sliding of F-actin and myosin. The earliest detailed model based on cryo-electron microscopy (cryoEM) and X-ray crystallography postulated that higher actin affinity and lever arm movement were coupled to closure of a feature of the myosin head dubbed the actin-binding cleft. Several studies since then using crystallography of myosin-V and cryoEM structures of F-actin bound myosin-I, -II and -V have provided details of this model. The smooth muscle myosin II interaction with F-actin may differ from those for striated and non-muscle myosin II due in part to different lengths of important surface loops. Here we report a ∼6 Å resolution reconstruction of F-actin decorated with the nucleotide-free recombinant smooth muscle myosin-II motor domain (MD) from images recorded using a direct electron detector. Resolution is highest for F-actin and the actin-myosin interface (3.5-4 Å) and lowest (∼6-7 Å) for those parts of the MD at the highest radius. Atomic models built into the F-actin density are quite comparable to those previously reported for rabbit muscle actin and show density from the bound ADP. The atomic model of the MD, is quite similar to a recently published structure of vertebrate non-muscle myosin II bound to F-actin and a crystal structure of nucleotide free myosin-V. Larger differences are observed when compared to the cryoEM structure of F-actin decorated with rabbit skeletal muscle myosin subfragment 1. The differences suggest less closure of the 50 kDa domain in the actin bound skeletal muscle myosin structure.
History
DepositionNov 2, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 19, 2018Provider: repository / Type: Initial release
Revision 2.0Oct 17, 2018Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Non-polymer description / Structure summary
Category: atom_site / atom_type ...atom_site / atom_type / chem_comp / entity / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_conn_angle / struct_conn / struct_site
Item: _atom_site.auth_atom_id / _atom_site.auth_comp_id ..._atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.type_symbol / _chem_comp.formula / _chem_comp.formula_weight / _chem_comp.id / _chem_comp.mon_nstd_flag / _chem_comp.name / _chem_comp.type / _entity.formula_weight / _entity.pdbx_description / _pdbx_entity_nonpoly.comp_id / _pdbx_entity_nonpoly.name / _pdbx_nonpoly_scheme.auth_mon_id / _pdbx_nonpoly_scheme.mon_id / _pdbx_nonpoly_scheme.pdb_mon_id / _pdbx_struct_conn_angle.ptnr2_auth_comp_id / _pdbx_struct_conn_angle.ptnr2_label_atom_id / _pdbx_struct_conn_angle.ptnr2_label_comp_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_site.details / _struct_site.pdbx_auth_comp_id
Revision 2.1Dec 4, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 2.2Mar 13, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_struct_oper_list
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_oper_list.name / _pdbx_struct_oper_list.symmetry_operation / _pdbx_struct_oper_list.type

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Structure visualization

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  • Biological unit as representative helical assembly
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Structure viewerMolecule:
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Assembly

Deposited unit
H: Myosin-11
C: Actin, alpha skeletal muscle
hetero molecules


Theoretical massNumber of molelcules
Total (without water)133,8924
Polymers133,4402
Non-polymers4522
Water00
1
H: Myosin-11
C: Actin, alpha skeletal muscle
hetero molecules
x 7


Theoretical massNumber of molelcules
Total (without water)937,24228
Polymers934,08114
Non-polymers3,16114
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
helical symmetry operation6
2


  • Idetical with deposited unit
  • helical asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
SymmetryHelical symmetry: (Circular symmetry: 1 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 7 / Rise per n subunits: 28.18685 Å / Rotation per n subunits: -166.77931 °)

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Components

#1: Protein Myosin-11 / Myosin heavy chain 11 / Myosin heavy chain / gizzard smooth muscle


Mass: 91343.227 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Gallus gallus (chicken) / Tissue: skeletal muscle / Gene: MYH11 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P10587
#2: Protein Actin, alpha skeletal muscle / Alpha-actin-1


Mass: 42096.953 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Oryctolagus cuniculus (rabbit) / References: UniProt: P68135
#3: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Comment: ADP, energy-carrying molecule*YM
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg

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Experimental details

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Experiment

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

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Filamentous muscle alpha-actin decorated with the motor domain of recombinant smooth muscle myosin II motor domain expressed in Sf9 cellsCOMPLEX#1-#20MULTIPLE SOURCES
2alpha-actinCOMPLEX#11NATURAL
3myosin IICOMPLEX#21RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Oryctolagus cuniculus (rabbit)9986
23Gallus gallus (chicken)9031
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
Details: actin buffer: 10 mM imidazole, 10 mM KCl, 1.0 mM MgCl2, 1.0 mM EGTA, 0.5 mM DTT, pH 7.4, myosin buffer: 10 mM imidazole, 10 mM KCl, 1.0 mM MgCl2, 1.0 mM EGTA, 0.5 mM DTT, pH 7.0
SpecimenConc.: 0.1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: GATAN CRYOPLUNGE 3 / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 276 K
Details: Some specimens were frozen manually using a homemade plunger.

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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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 5000 nm / Nominal defocus min: 2200 nm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1.34 sec. / Electron dose: 60 e/Å2 / Detector mode: INTEGRATING / Film or detector model: DIRECT ELECTRON DE-20 (5k x 3k) / Num. of real images: 4000 / Details: Only 1417 of the 4000 recorded images were used.
Image scansMovie frames/image: 43 / Used frames/image: 1-43

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Processing

EM software
IDNameVersionCategory
2Leginonimage acquisition
4CTFFIND3.5CTF correction
7Rosettamodel fitting
9Rosettamodel refinement
10RELION1.2initial Euler assignment
11RELION1.2final Euler assignment
12RELION1.2classification
13RELION1.23D reconstruction
CTF correctionType: PHASE FLIPPING ONLY
Helical symmertyAngular rotation/subunit: -166.77931 ° / Axial rise/subunit: 28.18685 Å / Axial symmetry: C1
Particle selectionNum. of particles selected: 346395
Details: Each "particle" consisted of a filament segment masked to a length of 21.0 nm, or slightly more than 7 actin subunits with 2.76 nm separation. Adjacent filament segments overlapped by about ...Details: Each "particle" consisted of a filament segment masked to a length of 21.0 nm, or slightly more than 7 actin subunits with 2.76 nm separation. Adjacent filament segments overlapped by about 6 subunit repeats (approximately 84% overlap).
3D reconstructionResolution: 6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 85000 / Algorithm: EXACT BACK PROJECTION / Num. of class averages: 4 / Symmetry type: HELICAL
Atomic model buildingB value: 390.86 / Protocol: FLEXIBLE FIT / Space: REAL

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