1QVI

Crystal structure of scallop myosin S1 in the pre-power stroke state to 2.6 Angstrom resolution: flexibility and function in the head


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.212 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of scallop Myosin s1 in the pre-power stroke state to 2.6 a resolution: flexibility and function in the head.

Gourinath, S.Himmel, D.M.Brown, J.H.Reshetnikova, L.Szent-Gyorgyi, A.G.Cohen, C.

(2003) Structure 11: 1621-1627

  • DOI: 10.1016/j.str.2003.10.013
  • Primary Citation of Related Structures:  
    1QVI

  • PubMed Abstract: 
  • We have extended the X-ray structure determination of the complete scallop myosin head in the pre-power stroke state to 2.6 A resolution, allowing an atomic comparison of the three major (weak actin binding) states of various myosins. We can now account for conformational differences observed in crystal structures in the so-called "pliant region" at the motor domain-lever arm junction between scallop and vertebrate smooth muscle myosins ...

    We have extended the X-ray structure determination of the complete scallop myosin head in the pre-power stroke state to 2.6 A resolution, allowing an atomic comparison of the three major (weak actin binding) states of various myosins. We can now account for conformational differences observed in crystal structures in the so-called "pliant region" at the motor domain-lever arm junction between scallop and vertebrate smooth muscle myosins. A hinge, which may contribute to the compliance of the myosin crossbridge, has also been identified for the first time within the regulatory light-chain domain of the lever arm. Analysis of temperature factors of key joints of the motor domain, especially the SH1 helix, provides crystallographic evidence for the existence of the "internally uncoupled" state in diverse isoforms. The agreement between structural and solution studies reinforces the view that the unwinding of the SH1 helix is a part of the cross-bridge cycle in many myosins.


    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, striated muscle A840Argopecten 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 Y156Argopecten 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 Z156Argopecten irradiansMutation(s): 0 
Find proteins for P07291 (Argopecten irradians)
Explore P07291 
Go to UniProtKB:  P07291
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download Ideal Coordinates CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
VO4
Query on VO4

Download Ideal Coordinates CCD File 
A
VANADATE ION
O4 V
LSGOVYNHVSXFFJ-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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Z
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A, Y
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.212 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.375α = 90
b = 285.623β = 114.5
c = 59.831γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-16
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance