Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 14-mer - A7B7 Local Symmetry: Helical - H  (3D View)
Local Stoichiometry: Homo 7-mer - B7 

Local Symmetry: Helical - H  (3D View)
Local Stoichiometry: Homo 7-mer - B7 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: microscopy

Macromolecule Content

• Total Structure Weight: 133.89 kDa 
• Atom Count: 8832 
• Modelled Residue Count: 1104 
• Deposited Residue Count: 1175 
• Unique protein chains: 2

6BIH

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

• PDB DOI: 10.2210/pdb6BIH/pdb
• EM Map EMD-7100:EMDBEMDataResource

• Classification: MOTOR PROTEIN
• Organism(s): Gallus gallus, Oryctolagus cuniculus
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• 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 (NIH/NIGMS), National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI), National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS), American Heart Association, National Institutes of Health/National Center for Research Resources (NIH/NCRR), National Institutes of Health/Office of the Director

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 6.00 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: HELICAL 

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

• PubMed: 29038012 
• DOI: 10.1016/j.jsb.2017.10.003
• Primary Citation of Related Structures:  
  6BIH


• 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 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.

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Organizational Affiliation: 

Institute of Molecular Biophysics, Kasha Laboratory, Florida State University, Tallahassee, FL 32306-4380, United States. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Myosin-11	A [auth H]	798	Gallus gallus	Mutation(s): 0  Gene Names: MYH11
UniProt
Find proteins for P10587 (Gallus gallus) Explore P10587  Go to UniProtKB:  P10587

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Actin, alpha skeletal muscle	B [auth C]	377	Oryctolagus cuniculus	Mutation(s): 0  Gene Names: ACTA1, ACTA
UniProt
Find proteins for P68135 (Oryctolagus cuniculus) Explore P68135  Go to UniProtKB:  P68135

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	C	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	D [auth C]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 6.00 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: HELICAL 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-11-02 
• Released Date: 2018-09-19 
Deposition Author(s): Taylor, K.A., Banerjee, C., Hu, Z.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01 GM30598
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)	United States	P01 HL110869
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)	United States	R01 AR53975
American Heart Association	United States	15PRE25090150
National Institutes of Health/National Center for Research Resources (NIH/NCRR)	United States	S10 RR25080
National Institutes of Health/Office of the Director	United States	S10 OD018142

Revision History  

• Version 1.0: 2018-09-19
  Type: Initial release
  
• Version 2.0: 2018-10-17
  Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
• Version 2.1: 2019-12-04
  Changes: Author supporting evidence