title: Position of the amino terminus of myosin light chain 1 and light chain 2 determined by electron microscopy with monoclonal antibody.
abstract: The position of the N terminus of myosin light chain 1 (LC1) and myosin light chain 2 (LC2) of rabbit skeletal muscle was mapped on the myosin head with a monoclonal antibody (SI304), which recognized the amino acid sequence N-trimethylalanyl-prolyl-lysyl-lysyl at the N terminus of LC1 and LC2. The complex of the antibody and myosin was observed by electron microscopy. By selective cleavage of the N terminus of LC1 or LC2 with papain or chymotrypsin, the position of the N terminus of LC1 and LC2 was determined separately. The N terminus of LC2 is located at the head-rod junction. The N terminus of LC1 is 11 nm (+/- 3 nm, standard deviation) from the head-rod junction. This position is near the actin-binding site of the myosin head.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal; D003429:Cross Reactions; D000939:Epitopes; D008854:Microscopy, Electron; D009218:Myosins / Q000276:immunology; D011817:Rabbits
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D009218:Myosins