Granum PE, Whitaker JR, Skjelkvåle R. Trypsin activation of enterotoxin from Clostridium perfringens type A: fragmentation and some physicochemical properties.
BIOCHIMICA ET BIOPHYSICA ACTA 1981;
668:325-32. [PMID:
6165395 DOI:
10.1016/0005-2795(81)90165-3]
[Citation(s) in RCA: 51] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Clostridium perfringens type A enterotoxin was activated about 3-fold by treatment with trypsin, without an observed change in molecular weight. On denaturation in 8 M urea, the trypsinated enterotoxin lost a small peptide of about 4000 daltons. The single cysteine residue of enterotoxin was in the small peptide together with seven out of nine residues of proline. Trypsin activation, without removal of the small peptide, increased the 'outside' number of amino groups from eight to eleven. The trypsin treatment of the enterotoxin did not change the antigenic properties of the protein. Glycine was the C-terminal residue of the native enterotoxin while the dansyl alpha-amino acid of the N-terminal could not be identified.
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