Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 131029.81 
• Atom Count: 8279 
• Residue Count: 1147 
• Unique protein chains: 3

1B7T

MYOSIN DIGESTED BY PAPAIN

• DOI: 10.2210/pdb1B7T/pdb

• Classification: MYOSIN
• Organism(s): Argopecten irradians


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

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 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 
• Also Cited By: 3DTP, 3JAX


• 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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

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

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

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

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 Å
• R-Value Free: 0.297 
• R-Value Work: 0.224 
• Space Group: P 1

Unit Cell:

Length (Å)	Angle (°)
a = 51.700	α = 89.10
b = 58.900	β = 90.00
c = 138.900	γ = 73.50

Software Package:

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

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
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance