title: The stoichiometry of the components of arthropod thin filaments.
abstract: Limulus thin filaments confer calcium sensitivity on calcium-independent myosins and contain in addition to actin and tropomyosin, three troponin components. The molar ratio of actin:tropomyosin:troponin sub-unit T (TN-T): troponin sub-unit C (TN-C) is approximately 7:1:1:1, as in vertebrates, but twice the amount of the troponin sub-unit I (TN-I) may be present. Arthropod troponin binds approximately 1 mole Ca/mol troponin, a significantly smaller amount than bound by vertebrate troponin.
mesh_terms: D000199:Actins / Q000032:analysis*; D000818:Animals; D001097:Arachnida / Q000032:analysis* / Q000378:metabolism; D001665:Binding Sites; D002118:Calcium / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D009124:Muscle Proteins / Q000032:analysis*; D009210:Myofibrils / Q000032:analysis*; D011485:Protein Binding; D014335:Tropomyosin / Q000032:analysis*; D014336:Troponin / Q000032:analysis* / Q000378:metabolism
chemical_list: D000199:Actins; D009124:Muscle Proteins; D014335:Tropomyosin; D014336:Troponin; D002118:Calcium