3I5G

Crystal structure of rigor-like squid myosin S1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.252 

Starting Model: experimental
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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: https://doi.org/10.1016/j.str.2007.03.010
  • Primary Citation of Related Structures:  
    2EC6, 2OS8, 2OTG, 3I5F, 3I5G, 3I5H, 3I5I

  • 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). 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
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin heavy chain isoform A839Doryteuthis pealeiiMutation(s): 0 
UniProt
Find proteins for O44934 (Doryteuthis pealeii)
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Go to UniProtKB:  O44934
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UniProt GroupO44934
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin regulatory light chain LC-2, mantle muscle153Todarodes pacificusMutation(s): 0 
UniProt
Find proteins for P08052 (Todarodes pacificus)
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UniProt GroupP08052
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin catalytic light chain LC-1, mantle muscle159Todarodes pacificusMutation(s): 0 
UniProt
Find proteins for P05945 (Todarodes pacificus)
Explore P05945 
Go to UniProtKB:  P05945
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UniProt GroupP05945
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.252 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 194.138α = 90
b = 101.751β = 105.74
c = 80.651γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-07-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description