1SR6

Structure of nucleotide-free scallop myosin S1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Myosin subfragment 1 structures reveal a partially bound nucleotide and a complex salt bridge that helps couple nucleotide and actin binding.

Risal, D.Gourinath, S.Himmel, D.M.Szent-Gyorgyi, A.G.Cohen, C.

(2004) Proc.Natl.Acad.Sci.Usa 101: 8930-8935

  • DOI: 10.1073/pnas.0403002101
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Structural studies of myosin have indicated some of the conformational changes that occur in this protein during the contractile cycle, and we have now observed a conformational change in a bound nucleotide as well. The 3.1-A x-ray structure of the s ...

    Structural studies of myosin have indicated some of the conformational changes that occur in this protein during the contractile cycle, and we have now observed a conformational change in a bound nucleotide as well. The 3.1-A x-ray structure of the scallop myosin head domain (subfragment 1) in the ADP-bound near-rigor state (lever arm =45 degrees to the helical actin axis) shows the diphosphate moiety positioned on the surface of the nucleotide-binding pocket, rather than deep within it as had been observed previously. This conformation strongly suggests a specific mode of entry and exit of the nucleotide from the nucleotide-binding pocket through the so-called "front door." In addition, using a variety of scallop structures, including a relatively high-resolution 2.75-A nucleotide-free near-rigor structure, we have identified a conserved complex salt bridge connecting the 50-kDa upper and N-terminal subdomains. This salt bridge is present only in crystal structures of muscle myosin isoforms that exhibit a strong reciprocal relationship (also known as coupling) between actin and nucleotide affinity.


    Related Citations: 
    • Crystallographic findings on the internally uncoupled and near-rigor states of myosin: further insights into the mechanics of the motor
      Himmel, D.M.,Gourinath, S.,Reshetnikova, L.,Shen, Y.,Szent-Gyorgyi, A.G.,Cohen, C.
      (2002) Proc.Natl.Acad.Sci.USA 99: 12645
    • Crystal structure of scallop Myosin s1 in the pre-power stroke state to 2.6 a resolution: flexibility and function in the head
      Gourinath, S.,Himmel, D.M.,Brown, J.H.,Reshetnikova, L.,Szent-Gyorgyi, A.G.,Cohen, C.
      (2003) Structure 11: 1621


    Organizational Affiliation

    Rosenstiel Basic Medical Sciences Research Center, MS 029, Waltham, MA 02454-9110, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin heavy chain, striated muscle
A
840Argopecten irradiansMutation(s): 0 
Find proteins for P24733 (Argopecten irradians)
Go to UniProtKB:  P24733
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Myosin regulatory light chain, striated adductor muscle
B
156Argopecten irradiansMutation(s): 0 
Find proteins for P13543 (Argopecten irradians)
Go to UniProtKB:  P13543
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Myosin essential light chain, striated adductor muscle
C
156Argopecten irradiansMutation(s): 0 
Find proteins for P07291 (Argopecten irradians)
Go to UniProtKB:  P07291
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

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Download CCD File 
C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.242 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 83.591α = 90.00
b = 51.109β = 98.02
c = 162.329γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CCP4data scaling
CNSrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-06-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance