1O1D

MOLECULAR MODELS OF AVERAGED RIGOR CROSSBRIDGES FROM TOMOGRAMS OF INSECT FLIGHT MUSCLE


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 70.0 Å
  • Aggregation State: TISSUE 
  • Reconstruction Method: TOMOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Molecular Modeling of Averaged Rigor Crossbridges from Tomograms of Insect Flight Muscle

Chen, L.F.Winkler, H.Reedy, M.K.Reedy, M.C.Taylor, K.A.

(2002) J Struct Biol 138: 92-104

  • DOI: 10.1016/s1047-8477(02)00013-8
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Electron tomography, correspondence analysis, molecular model building, and real-space refinement provide detailed 3-D structures for in situ myosin crossbridges in the nucleotide-free state (rigor), thought to represent the end of the power stroke. ...

    Electron tomography, correspondence analysis, molecular model building, and real-space refinement provide detailed 3-D structures for in situ myosin crossbridges in the nucleotide-free state (rigor), thought to represent the end of the power stroke. Unaveraged tomograms from a 25-nm longitudinal section of insect flight muscle preserved native structural variation. Recurring crossbridge motifs that repeat every 38.7 nm along the actin filament were extracted from the tomogram and classified by correspondence analysis into 25 class averages, which improved the signal to noise ratio. Models based on the atomic structures of actin and of myosin subfragment 1 were rebuilt to fit 11 class averages. A real-space refinement procedure was applied to quantitatively fit the reconstructions and to minimize steric clashes between domains introduced during the fitting. These combined procedures show that no single myosin head structure can fit all the in situ crossbridges. The validity of the approach is supported by agreement of these atomic models with fluorescent probe data from vertebrate muscle as well as with data from regulatory light chain crosslinking between heads of smooth muscle heavy meromyosin when bound to actin.


    Related Citations: 
    • Real Space Refinement of Acto-Myosin Structures from Sectioned Muscle.
      Chen, L.F., Blanc, E., Chapman, M.S., Taylor, K.A.
      (2001) J Struct Biol 133: 221
    • Multivariate Statistical Analysis of Three-Dimensional Cross-Bridge Motifs in Insect Flight Muscle
      Winkler, H., Taylor, K.A.
      (1999) Ultramicroscopy 77: 141
    • The Use of Electron Tomography for Structural Analysis of Disordered Protein Arrays.
      Taylor, K.A., Tang, J., Cheng, Y., Winkler, H.
      (1997) J Struct Biol 120: 372

    Organizational Affiliation

    Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306-4380, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SKELETAL MUSCLE MYOSIN IIA, D, G, J, M, P840Gallus gallusMutation(s): 0 
Find proteins for P13538 (Gallus gallus)
Explore P13538 
Go to UniProtKB:  P13538
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SKELETAL MUSCLE MYOSIN II REGULATORY LIGHT CHAINB, E, H, K, N, Q145Gallus gallusMutation(s): 0 
Gene Names: MYLPF
Find proteins for P02609 (Gallus gallus)
Explore P02609 
Go to UniProtKB:  P02609
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SKELETAL MUSCLE MYOSIN II ESSENTIAL LIGHT CHAINC, F, I, L, O, R147Gallus gallusMutation(s): 0 
Find proteins for P02605 (Gallus gallus)
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Go to UniProtKB:  P02605
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
SKELETAL MUSCLE ACTIN0, 1, 2, 3, 4, 5, 7, 8, 9, V, W, X, Y, Z375Oryctolagus cuniculusMutation(s): 0 
Gene Names: ACTA1ACTA
Find proteins for P68135 (Oryctolagus cuniculus)
Explore P68135 
Go to UniProtKB:  P68135
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLY
Query on MLY
A,D,G,J,M,PL-PEPTIDE LINKINGC8 H18 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 70.0 Å
  • Aggregation State: TISSUE 
  • Reconstruction Method: TOMOGRAPHY 

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-04
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-07-18
    Changes: Data collection
  • Version 1.4: 2019-11-06
    Changes: Advisory, Data collection, Derived calculations, Other