3JTD

Calcium-free Scallop Myosin Regulatory Domain with ELC-D19A Point Mutation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.57 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The on-off switch in regulated myosins: different triggers but related mechanisms.

Himmel, D.M.Mui, S.O'Neall-Hennessey, E.Szent-Gyorgyi, A.G.Cohen, C.

(2009) J Mol Biol 394: 496-505

  • DOI: 10.1016/j.jmb.2009.09.035
  • Primary Citation of Related Structures:  
    3JTD, 3JVT

  • PubMed Abstract: 
  • In regulated myosin, motor and enzymatic activities are toggled between the on-state and off-state by a switch located on its lever arm domain, here called the regulatory domain (RD). This region consists of a long alpha-helical "heavy chain" stabilized by a "regulatory" light chain (RLC) and an "essential" light chain (ELC) ...

    In regulated myosin, motor and enzymatic activities are toggled between the on-state and off-state by a switch located on its lever arm domain, here called the regulatory domain (RD). This region consists of a long alpha-helical "heavy chain" stabilized by a "regulatory" light chain (RLC) and an "essential" light chain (ELC). The on-state is activated by phosphorylation of the RLC of vertebrate smooth muscle RD or by direct binding of Ca(2+) to the ELC of molluscan RD. Crystal structures are available only for the molluscan RD. To understand in more detail the pathway between the on-state and the off-state, we have now also determined the crystal structure of a molluscan (scallop) RD in the absence of Ca(2+). Our results indicate that loss of Ca(2+) abolishes most of the interactions between the light chains and may increase the flexibility of the RD heavy chain. We propose that disruption of critical links with the C-lobe of the RLC is the key event initiating the off-state in both smooth muscle myosins and molluscan myosins.


    Related Citations: 
    • Structure of the Regulatory Domain of Scallop Myosin at 2 Resolution:Implications for Regulation.
      Houdusse, A., Cohen, C.
      (1996) Structure 4: 21
    • Structure of the Regulatory Domain of Scallop Myosin at 2.8 Resolution.
      Xie, X., Harrison, D.H., Schlichting, I., Sweet, R.M., Kalabokis, V.N., Szent-Gy rgyi, A., Cohen, C.
      (1994) Nature 368: 306

    Organizational Affiliation

    Rosenstiel Basic Medical Sciences Research Center, Biology Department, Brandeis University, Waltham, MA 02453-2728, USA. himmel@cabm.rutgers.edu



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin heavy chain, striated adductor muscle A65Argopecten irradiansMutation(s): 0 
Find proteins for P24733 (Argopecten irradians)
Explore P24733 
Go to UniProtKB:  P24733
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin regulatory light chain, striated adductor muscle B156Argopecten irradiansMutation(s): 0 
Find proteins for P13543 (Argopecten irradians)
Explore P13543 
Go to UniProtKB:  P13543
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin essential light chain, striated adductor muscle C156Argopecten irradiansMutation(s): 1 
Find proteins for P07291 (Argopecten irradians)
Explore P07291 
Go to UniProtKB:  P07291
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.57 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.233 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42α = 113.36
b = 52.78β = 91.56
c = 58.51γ = 100.6
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Advisory, Refinement description