From Proteopedia
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Bovine Pancreatic Trypsin Inhibitor (BPTI) Mutant with Altered Binding Loop Sequence
BPTI is a single chain polypeptide with 58 amino acids. It's secondary structure includes one and . The beta sheet consists of (Ile18 to Asn 24 and Leu 29 to Tyr 35) with a consisting of four residues (Ala 25, Lys 26, Ala 27, Gly 28). Alpha helix
is 4 residues (Asp 3 to Cys 6), and is 8 residues (Ala 48 to Cys 55). There are three intrachain disulfide bonds in this polypeptide, one between , one between , and one between . This protein has a (gray) with polar and charged residues (purple) occurring mostly on the .