3JAX

Heavy meromyosin from Schistosoma mansoni muscle thick filament by negative stain EM


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 23 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

An invertebrate smooth muscle with striated muscle myosin filaments.

Sulbaran, G.Alamo, L.Pinto, A.Marquez, G.Mendez, F.Padron, R.Craig, R.

(2015) Proc.Natl.Acad.Sci.USA 112: E5660-E5668

  • DOI: 10.1073/pnas.1513439112

  • PubMed Abstract: 
  • Muscle tissues are classically divided into two major types, depending on the presence or absence of striations. In striated muscles, the actin filaments are anchored at Z-lines and the myosin and actin filaments are in register, whereas in smooth mu ...

    Muscle tissues are classically divided into two major types, depending on the presence or absence of striations. In striated muscles, the actin filaments are anchored at Z-lines and the myosin and actin filaments are in register, whereas in smooth muscles, the actin filaments are attached to dense bodies and the myosin and actin filaments are out of register. The structure of the filaments in smooth muscles is also different from that in striated muscles. Here we have studied the structure of myosin filaments from the smooth muscles of the human parasite Schistosoma mansoni. We find, surprisingly, that they are indistinguishable from those in an arthropod striated muscle. This structural similarity is supported by sequence comparison between the schistosome myosin II heavy chain and known striated muscle myosins. In contrast, the actin filaments of schistosomes are similar to those of smooth muscles, lacking troponin-dependent regulation. We conclude that schistosome muscles are hybrids, containing striated muscle-like myosin filaments and smooth muscle-like actin filaments in a smooth muscle architecture. This surprising finding has broad significance for understanding how muscles are built and how they evolved, and challenges the paradigm that smooth and striated muscles always have distinctly different components.


    Related Citations: 
    • Three-dimensional reconstruction of tarantula myosin filaments suggests how phosphorylation may regulate myosin activity.
      Alamo, L.,Wriggers, W.,Pinto, A.,Bartoli, F.,Salazar, L.,Zhao, F.Q.,Craig, R.,Padron, R.
      (2008) J.Mol.Biol. 384: 780
    • Refined model of the 10S conformation of smooth muscle myosin by cryo-electron microscopy 3D image reconstruction.
      Liu, J.,Wendt, T.,Taylor, D.,Taylor, K.
      (2003) J.Mol.Biol. 329: 963
    • Crystal structures of human cardiac beta-myosin II S2-Delta provide insight into the functional role of the S2 subfragment.
      Blankenfeldt, W.,Thoma, N.H.,Wray, J.S.,Gautel, M.,Schlichting, I.
      (2006) Proc.Natl.Acad.Sci.USA 103: 17713
    • 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

    Centro de BiologĂ­a Estructural, Instituto Venezolano de Investigaciones CientĂ­ficas (IVIC), Caracas 1020A, Venezuela; Department of Cell and Developmental Biology, University of Massachusetts Medical School, Worcester, MA 01655.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
myosin 2 heavy chain
A, B
974Schistosoma mansoniMutation(s): 0 
Find proteins for A0A0R4I956 (Schistosoma mansoni)
Go to UniProtKB:  A0A0R4I956
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
smooth muscle myosin essential light chain
C, D
151Schistosoma mansoniMutation(s): 0 
Find proteins for A0A0R4I957 (Schistosoma mansoni)
Go to UniProtKB:  A0A0R4I957
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
myosin regulatory light chain
E, F
196Schistosoma mansoniMutation(s): 0 
Find proteins for A0A0R4I958 (Schistosoma mansoni)
Go to UniProtKB:  A0A0R4I958
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 23 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-10-07
    Type: Initial release
  • Version 1.1: 2015-10-21
    Type: Database references
  • Version 1.2: 2015-11-04
    Type: Database references
  • Version 1.3: 2018-07-18
    Type: Author supporting evidence, Data collection