title: Three-dimensional reconstruction of rigor insect flight muscle from tilted thin sections.
abstract: Rigor cross-bridges show two conformations paired within each 38.7-nm axial repeat. The two forms may express two stages of the cross-bridge cycle during contraction. Differing numbers of myosin heads per cross-bridge and associated helical changes in the thin filament distinguish the two forms and suggest that both myosin heads usually bind to a single thin filament.
mesh_terms: D000199:Actins / Q000378:metabolism; D000818:Animals; D001517:Coleoptera / Q000648:ultrastructure*; D003599:Cytoskeleton / Q000378:metabolism / Q000648:ultrastructure; D005426:Flight, Animal; D046911:Macromolecular Substances; D008854:Microscopy, Electron; D008954:Models, Biological; D009119:Muscle Contraction; D009132:Muscles / Q000648:ultrastructure*; D009218:Myosins / Q000378:metabolism; D011487:Protein Conformation; D014336:Troponin / Q000378:metabolism; D014961:X-Ray Diffraction
chemical_list: D000199:Actins; D046911:Macromolecular Substances; D014336:Troponin; D009218:Myosins