1L2O

SCALLOP MYOSIN S1-ADP-p-PDM IN THE ACTIN-DETACHED CONFORMATION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.327 
  • R-Value Work: 0.280 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystallographic findings on the internally uncoupled and near-rigor states of myosin: further insights into the mechanics of the motor.

Himmel, D.M.Gourinath, S.Reshetnikova, L.Shen, Y.Szent-Gyorgyi, A.G.Cohen, C.

(2002) Proc.Natl.Acad.Sci.USA 99: 12645-12650

  • DOI: 10.1073/pnas.202476799
  • Primary Citation of Related Structures:  
  • Also Cited By: 1SR6

  • PubMed Abstract: 
  • Here we report a 2.3-A crystal structure of scallop myosin S1 complexed with ADP.BeF(x), as well as three additional structures (at 2.8-3.8 A resolution) for this S1 complexed with ATP analogs, some of which are cross-linked by para-phenyl dimaleimid ...

    Here we report a 2.3-A crystal structure of scallop myosin S1 complexed with ADP.BeF(x), as well as three additional structures (at 2.8-3.8 A resolution) for this S1 complexed with ATP analogs, some of which are cross-linked by para-phenyl dimaleimide, a short intramolecular cross-linker. In all cases, the complexes are characterized by an unwound SH1 helix first seen in an unusual 2.5-A scallop myosin-MgADP structure and described as corresponding to a previously unrecognized actin-detached internally uncoupled state. The unwinding of the SH1 helix effectively uncouples the converter/lever arm module from the motor and allows cross-linking by para-phenyl dimaleimide, which has been shown to occur only in weak actin-binding states of the molecule. Mutations near the metastable SH1 helix that disable the motor can be accounted for by viewing this structural element as a clutch controlling the transmission of torque to the lever arm. We have also determined a 3.2-A nucleotide-free structure of scallop myosin S1, which suggests that in the near-rigor state there are two conformations in the switch I loop, depending on whether nucleotide is present. Analysis of the subdomain motions in the weak actin-binding states revealed by x-ray crystallography, together with recent electron microscopic results, clarify the mechanical roles of the parts of the motor in the course of the contractile cycle and suggest how strong binding to actin triggers both the power stroke and product release.


    Related Citations: 
    • Atomic Structure of Scallop Myosin Subfragment S1 Complexed with MgADP: A Novel Conformation of the Myosin Head
      Houdusse, A.,Kalabokis, V.N.,Himmel, D.,Szent-Gyorgyi, A.G.,Cohen, C.
      (1999) Cell 97: 459


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MYOSIN HEAVY CHAIN
A
835Argopecten irradiansMutation(s): 0 
Find proteins for P24733 (Argopecten irradians)
Go to UniProtKB:  P24733
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MYOSIN REGULATORY LIGHT CHAIN
B
156Argopecten irradiansMutation(s): 0 
Find proteins for P13543 (Argopecten irradians)
Go to UniProtKB:  P13543
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
MYOSIN ESSENTIAL LIGHT CHAIN
C
156Argopecten irradiansMutation(s): 0 
Find proteins for P07291 (Argopecten irradians)
Go to UniProtKB:  P07291
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

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

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Download CCD File 
C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
PDM
Query on PDM

Download SDF File 
Download CCD File 
A
4-[4-(2,5-DIOXO-PYRROLIDIN-1-YL)-PHENYLAMINO]-4-HYDROXY-BUTYRIC ACID
PARA-PHENYL DIMALEMIDE
C14 H16 N2 O5
SUETUOGYOWOLNJ-NSHDSACASA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.327 
  • R-Value Work: 0.280 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 51.800α = 95.60
b = 57.000β = 96.30
c = 150.500γ = 101.50
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-10-30
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance