The Amino Acid Sequence of the Double-Headed Proteinase Inhibitor from Canine Submandibular Glands, III. Sequencing studies

Abstract
Canine submandibular glands contain 3 polyvalent, double-headed proteinase inhibitors. The amino acid sequences of the 2 main inhibitors were determined. They differ only in the substitution of one Lys for a Glu residue. The inhibitor molecules are composed of 2 halves (domains), one antitryptic and one antichymotryptic. The 2 domains are covalently linked by 3 amino acid residues. The domains are structurally related to each other and to the sequenced monovalent secretory pancreatic trypsin inhibitors.