title: Bovine cardiac troponin subunits: binary complexes and reconstitution of whole troponin.
abstract: The reconstitution of bovine cardiac troponin from its subunits has been investigated using hydrodynamic techniques. Gel filtration (Sephacryl S-300) and sedimentation velocity experiments indicate that troponin-C and troponin-I form a stable binary complex (1:1 mole ratio) with an apparent Stokes' radius of 36 A (frictional ratio = 1.6). Troponin-C and troponin-T do not interact significantly while troponin-I and troponin-T undergo partial complex formation. The effect of subunit ratio on the reconstitution of whole troponin has been examined by SDS-polyacrylamide gel electrophoresis and gel filtration and the results suggest that native troponin contains the subunits in an equimolar ratio.
mesh_terms: D000818:Animals; D002417:Cattle; D002498:Centrifugation; D002850:Chromatography, Gel; D046911:Macromolecular Substances; D008970:Molecular Weight; D009132:Muscles / Q000032:analysis; D009206:Myocardium / Q000032:analysis*; D014336:Troponin
chemical_list: D046911:Macromolecular Substances; D014336:Troponin