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Primary structure of cathepsin D inhibitor from potatoes and its structure relationship to soybean trypsin inhibitor family
Author(s) -
Mareš M.,
Meloun B.,
Pavlík M.,
Kostka V.,
Baudyš M.
Publication year - 1989
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(89)81435-8
Subject(s) - trypsin inhibitor , kunitz sti protease inhibitor , proteinase inhibitor , chemistry , protein primary structure , biochemistry , trypsin , enzyme , peptide sequence , gene
A novel effective procedure for the purification of cathepsin D inhibitor from potatoes (PDI) was developed. The amino acid sequence of PDI was determined by analysis of the cyanogen bromide digest and of the limited tryptic and chymotryptic digests of the protein. The inhibitor is a single polypeptide chain protein consisting of 188 residues with a simple sugar moiety attached to Asn‐19. The tentative disulfide pairings are also suggested. The sequence data clearly indicate that PDI is homologous with the soybean trypsin inhibitor (STI) (Kunitz) family. The active center of PDI for trypsin inhibition was identified as Pro‐Val‐Arg‐Phe in analogy to STI.