Biological Assembly 1  

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

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 87.25 kDa 
• Atom Count: 6368 
• Modelled Residue Count: 738 
• Deposited Residue Count: 761 
• Unique protein chains: 1

1FMW

CRYSTAL STRUCTURE OF THE MGATP COMPLEX FOR THE MOTOR DOMAIN OF DICTYOSTELIUM MYOSIN II

• PDB DOI: 10.2210/pdb1FMW/pdb

• Classification: CONTRACTILE PROTEIN
• Organism(s): Dictyostelium discoideum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-08-18 Released: 2000-11-22 
• Deposition Author(s): Bauer, C.B., Holden, H.M., Thoden, J.B., Smith, R., Rayment, I.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.286 
• R-Value Work: 0.206 
• R-Value Observed: 0.206 

Literature

X-ray structures of the apo and MgATP-bound states of Dictyostelium discoideum myosin motor domain.

Bauer, C.B., Holden, H.M., Thoden, J.B., Smith, R., Rayment, I.

(2000) J Biol Chem 275: 38494-38499

• PubMed: 10954715 
• DOI: 10.1074/jbc.M005585200
• Primary Citation of Related Structures:  
  1FMV, 1FMW


• PubMed Abstract: 
  

Myosin is the most comprehensively studied molecular motor that converts energy from the hydrolysis of MgATP into directed movement. Its motile cycle consists of a sequential series of interactions between myosin, actin, MgATP, and the products of hydrolysis, where the affinity of myosin for actin is modulated by the nature of the nucleotide bound in the active site. The first step in the contractile cycle occurs when ATP binds to actomyosin and releases myosin from the complex. We report here the structure of the motor domain of Dictyostelium discoideum myosin II both in its nucleotide-free state and complexed with MgATP. The structure with MgATP was obtained by soaking the crystals in substrate. These structures reveal that both the apo form and the MgATP complex are very similar to those previously seen with MgATPgammaS and MgAMP-PNP. Moreover, these structures are similar to that of chicken skeletal myosin subfragment-1. The crystallized protein is enzymatically active in solution, indicating that the conformation of myosin observed in chicken skeletal myosin subfragment-1 is unable to hydrolyze ATP and most likely represents the pre-hydrolysis structure for the myosin head that occurs after release from actin.

---

Organizational Affiliation: 

Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706-1544, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOSIN II HEAVY CHAIN	A	761	Dictyostelium discoideum	Mutation(s): 0  Gene Names: mhcA, DDB_G0286355
UniProt
Find proteins for P08799 (Dictyostelium discoideum) Explore P08799  Go to UniProtKB:  P08799

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ATP	C [auth A]	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.286 
• R-Value Work: 0.206 
• R-Value Observed: 0.206 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 104.1	α = 90
b = 180.4	β = 90
c = 54.2	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
TNT	refinement
DENZO	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-08-18 
• Released Date: 2000-11-22 
Deposition Author(s): Bauer, C.B., Holden, H.M., Thoden, J.B., Smith, R., Rayment, I.

Revision History  

• Version 1.0: 2000-11-22
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2012-11-21
  Changes: Atomic model, Experimental preparation