Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

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

Macromolecule Content

• Total Structure Weight: 131.03 kDa 
• Atom Count: 8383 
• Modelled Residue Count: 1057 
• Deposited Residue Count: 1147 
• Unique protein chains: 3

1B7T

MYOSIN DIGESTED BY PAPAIN

• DOI: 10.2210/pdb1B7T/pdb

• Classification: MYOSIN
• Organism(s): Argopecten irradians
• Mutation(s): No 


• Deposited: 1999-01-15 Released: 1999-05-12 
• Deposition Author(s): Houdusse, A., Kalabokis, V., Himmel, D., Szent-Gyorgyi, A.G., Cohen, C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.297 
• R-Value Work: 0.224 

Literature

Atomic structure of scallop myosin subfragment S1 complexed with MgADP: a novel conformation of the myosin head.

Houdusse, A., Kalabokis, V.N., Himmel, D., Szent-Gyorgyi, A.G., Cohen, C.

(1999) Cell 97: 459-470

• PubMed: 10338210 
• DOI: 10.1016/s0092-8674(00)80756-4
• Primary Citation of Related Structures:  
  1B7T


• PubMed Abstract: 
  

The crystal structure of a proteolytic subfragment from scallop striated muscle myosin, complexed with MgADP, has been solved at 2.5 A resolution and reveals an unusual conformation of the myosin head. The converter and the lever arm are in very different positions from those in either the pre-power stroke or near-rigor state structures; moreover, in contrast to these structures, the SH1 helix is seen to be unwound. Here we compare the overall organization of the myosin head in these three states and show how the conformation of three flexible "joints" produces rearrangements of the four major subdomains in the myosin head with different bound nucleotides. We believe that this novel structure represents one of the prehydrolysis ("ATP") states of the contractile cycle in which the myosin heads stay detached from actin.

---

Organizational Affiliation: 

Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, Massachusetts 02254-9110, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOSIN HEAVY CHAIN	A	835	Argopecten irradians	Mutation(s): 0
Find proteins for P24733 (Argopecten irradians) Explore P24733  Go to UniProtKB:  P24733

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOSIN REGULATORY LIGHT CHAIN	B [auth Y]	156	Argopecten irradians	Mutation(s): 0
Find proteins for P13543 (Argopecten irradians) Explore P13543  Go to UniProtKB:  P13543

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOSIN ESSENTIAL LIGHT CHAIN	C [auth Z]	156	Argopecten irradians	Mutation(s): 0
Find proteins for P07291 (Argopecten irradians) Explore P07291  Go to UniProtKB:  P07291

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	E [auth A]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
CA	G [auth Z]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
MG	D [auth A], F [auth Y]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.297 
• R-Value Work: 0.224 
• Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.7	α = 89.1
b = 58.9	β = 90
c = 138.9	γ = 73.5

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALA	data scaling
AMoRE	phasing
X-PLOR	refinement
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-01-15 
• Released Date: 1999-05-12 
Deposition Author(s): Houdusse, A., Kalabokis, V., Himmel, D., Szent-Gyorgyi, A.G., Cohen, C.

Revision History  

• Version 1.0: 1999-05-12
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance