3I5I

The crystal structure of squid myosin S1 in the presence of SO4 2-


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.330 
  • R-Value Work: 0.262 

wwPDB Validation   3D Report Full Report


This is version 1.1 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:  
    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) ...

    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 chain isoform AA839Doryteuthis pealeiiMutation(s): 0 
UniProt
Find proteins for O44934 (Doryteuthis pealeii)
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Go to UniProtKB:  O44934
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin regulatory light chain LC-2, mantle muscleB153Todarodes pacificusMutation(s): 0 
UniProt
Find proteins for P08052 (Todarodes pacificus)
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Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin catalytic light chain LC-1, mantle muscleC159Todarodes pacificusMutation(s): 0 
UniProt
Find proteins for P05945 (Todarodes pacificus)
Explore P05945 
Go to UniProtKB:  P05945
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
D [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
E [auth C]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.330 
  • R-Value Work: 0.262 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 195.192α = 90
b = 100.153β = 105.45
c = 80.189γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
HKL-2000data reduction
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