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The alkali light chain of rabbit skeletal muscle myosin, A1, was cyanylated with 2-nitro-5-thiocyanobenzoic acid, and the peptide bond at Cys 177 was subsequently cleaved in the presence of 0.05 M CaCl2. Two peptide fragments, from the N-terminal to the residue 176 (CF1) and from the residue 177 to the C-terminal (CF2), were obtained. The CD spectrum and the difference UV absorption spectrum induced by CaCl2 suggested that CF1 largely retained the higher order structure of A1. The CF1 fragment, however, could neither incorporate subfragment-1 (S-1) by an exchange reaction, nor bind with the renatured 20K fragment of S-1 heavy chain. On the other hand, the C-terminal fragment of 14 residues, CF2, could bind with the 20K fragment of S-1 heavy chain. These results indicate that the binding site of the alkali light chain for the heavy chain of myosin is located within the C-terminal 14 residues.
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