Lockman H A, Galen J E, Kaper J B
J Bacteriol. 1984 Sep;159(3):1086-9. doi: 10.1128/jb.159.3.1086-1089.1984.
The nucleotide sequence of the DNA encoding the ADP-ribosyltransferase (A1) fragment of cholera enterotoxin was determined. A putative precursor of the A1 peptide contains an 18-amino acid leader peptide, and the mature A1 peptide contains 194 amino acids. The primary structure of the A1 fragment from cholera enterotoxin is more related to that from a human enterotoxigenic Escherichia coli than to that from a porcine enterotoxigenic E. coli.