2OS8

Rigor-like structures of muscle myosins reveal key mechanical elements in the transduction pathways of this allosteric motor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.27 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.281 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Rigor-like Structures from Muscle Myosins Reveal Key Mechanical Elements in the Transduction Pathways of This Allosteric Motor.

Yang, Y.Gourinath, S.Kovacs, M.Nyitray, L.Reutzel, R.Himmel, D.M.O'neall-Hennessey, E.Reshetnikova, L.Szent-Gyorgyi, A.G.Brown, J.H.Cohen, C.

(2007) Structure 15: 553-564

  • DOI: 10.1016/j.str.2007.03.010
  • Primary Citation of Related Structures:  
    2OS8, 2OTG, 2EC6, 3I5G, 3I5H, 3I5I, 3I5F

  • PubMed Abstract: 
  • Unlike processive cellular motors such as myosin V, whose structure has recently been determined in a "rigor-like" conformation, myosin II from contracting muscle filaments necessarily spends most of its time detached from actin. By using squid and sea scallop sources, however, we have now obtained similar rigor-like atomic structures for muscle myosin heads (S1) ...

    Unlike processive cellular motors such as myosin V, whose structure has recently been determined in a "rigor-like" conformation, myosin II from contracting muscle filaments necessarily spends most of its time detached from actin. By using squid and sea scallop sources, however, we have now obtained similar rigor-like atomic structures for muscle myosin heads (S1). The significance of the hallmark closed actin-binding cleft in these crystal structures is supported here by actin/S1-binding studies. These structures reveal how different duty ratios, and hence cellular functions, of the myosin isoforms may be accounted for, in part, on the basis of detailed differences in interdomain contacts. Moreover, the rigor-like position of switch II turns out to be unique for myosin V. The overall arrangements of subdomains in the motor are relatively conserved in each of the known contractile states, and we explore qualitatively the energetics of these states.


    Organizational Affiliation

    Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02454, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin heavy chainA840Placopecten magellanicusMutation(s): 0 
Find proteins for Q26080 (Placopecten magellanicus)
Explore Q26080 
Go to UniProtKB:  Q26080
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin regulatory light chainB157Placopecten magellanicusMutation(s): 0 
Find proteins for Q26068 (Placopecten magellanicus)
Explore Q26068 
Go to UniProtKB:  Q26068
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin essential light chainC157Placopecten magellanicusMutation(s): 0 
Find proteins for Q26066 (Placopecten magellanicus)
Explore Q26066 
Go to UniProtKB:  Q26066
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
E [auth C]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.27 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.281 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.567α = 90
b = 50.359β = 98.72
c = 161.621γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-05-29
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance