6BIH

The Structure of the Actin-Smooth Muscle Myosin Motor Domain Complex in the Rigor State

  • Classification: MOTOR PROTEIN
  • Organism(s): Gallus gallus, Oryctolagus cuniculus
  • Expression System: Spodoptera frugiperda

  • Deposited: 2017-11-02 Released: 2018-09-19 
  • Deposition Author(s): Taylor, K.A., Banerjee, C., Hu, Z.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences; National Institutes of Health/National Heart, Lung, and Blood Institute; National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases; American Heart Association; National Institutes of Health/National Center for Research Resources; National Institutes of Health/Office of the Director 

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

The structure of the actin-smooth muscle myosin motor domain complex in the rigor state.

Banerjee, C.Hu, Z.Huang, Z.Warrington, J.A.Taylor, D.W.Trybus, K.M.Lowey, S.Taylor, K.A.

(2017) J. Struct. Biol. 200: 325-333

  • DOI: 10.1016/j.jsb.2017.10.003

  • PubMed 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 postulated that higher actin affinity and lever arm ...

    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.


    Organizational Affiliation

    Department of Computer Science, Florida State University, Tallahassee, FL 32306-4530, United States.,Institute of Molecular Biophysics, Kasha Laboratory, Florida State University, Tallahassee, FL 32306-4380, United States. Electronic address: taylor@bio.fsu.edu.,Institute of Molecular Biophysics, Kasha Laboratory, Florida State University, Tallahassee, FL 32306-4380, United States.,Health Science Research Facility 130, 149 Beaumont Avenue, Department of Molecular Physiology & Biophysics, University of Vermont, Burlington, VT 05405, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin-11
H
798Gallus gallusMutation(s): 0 
Gene Names: MYH11
Find proteins for P10587 (Gallus gallus)
Go to Gene View: MYH11
Go to UniProtKB:  P10587
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Actin, alpha skeletal muscle
C
377Oryctolagus cuniculusMutation(s): 0 
Gene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
C
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01 GM30598
National Institutes of Health/National Heart, Lung, and Blood InstituteUnited StatesP01 HL110869
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin DiseasesUnited StatesR01 AR53975
American Heart AssociationUnited States15PRE25090150
National Institutes of Health/National Center for Research ResourcesUnited StatesS10 RR25080
National Institutes of Health/Office of the DirectorUnited StatesS10 OD018142

Revision History 

  • Version 1.0: 2018-09-19
    Type: Initial release
  • Version 2.0: 2018-10-17
    Type: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary