3PN7

Visualizing new hinges and a potential major source of compliance in the lever arm of myosin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 

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Literature

Visualizing key hinges and a potential major source of compliance in the lever arm of myosin.

Brown, J.H.Senthil Kumar, V.S.O'Neall-Hennessey, E.Reshetnikova, L.Robinson, H.Nguyen-McCarty, M.Szent-Gyorgyi, A.G.Cohen, C.

(2011) Proc Natl Acad Sci U S A 108: 114-119

  • DOI: 10.1073/pnas.1016288107
  • Primary Citation of Related Structures:  
    3PN7

  • PubMed Abstract: 
  • We have determined the 2.3-Å-resolution crystal structure of a myosin light chain domain, corresponding to one type found in sea scallop catch ("smooth") muscle. This structure reveals hinges that may function in the "on" and "off" states of myosin. The molecule adopts two different conformations about the heavy chain "hook" and regulatory light chain (RLC) helix D ...

    We have determined the 2.3-Å-resolution crystal structure of a myosin light chain domain, corresponding to one type found in sea scallop catch ("smooth") muscle. This structure reveals hinges that may function in the "on" and "off" states of myosin. The molecule adopts two different conformations about the heavy chain "hook" and regulatory light chain (RLC) helix D. This conformational change results in extended and compressed forms of the lever arm whose lengths differ by 10 Å. The heavy chain hook and RLC helix D hinges could thus serve as a potential major and localized source of cross-bridge compliance during the contractile cycle. In addition, in one of the molecules of the crystal, part of the RLC N-terminal extension is seen in atomic detail and forms a one-turn alpha-helix that interacts with RLC helix D. This extension, whose sequence is highly variable in different myosins, may thus modulate the flexibility of the lever arm. Moreover, the relative proximity of the phosphorylation site to the helix D hinge suggests a potential role for conformational changes about this hinge in the transition between the on and off states of regulated myosins.


    Organizational Affiliation

    Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02454-9110, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin heavy chainA, D69Placopecten 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 chainB, E161Placopecten magellanicusMutation(s): 0 
Find proteins for Q26069 (Placopecten magellanicus)
Explore Q26069 
Go to UniProtKB:  Q26069
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin essential light chainC, F156Placopecten 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 
H [auth C], J [auth F]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.191 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.737α = 77.41
b = 68.779β = 85.94
c = 79.305γ = 73.61
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
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: 2011-01-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance