J. Biol. Chem., Vol. 255, Issue 17, 8273-8274, Sep, 1980
Structure and action of heteronemertine polypeptide toxins. Disulfide bonds of Cerebratulus lacteus toxin A-III
KM Blumenthal
The positions of the disulfides bonds in Cerebratulus lacteus toxin A- III
were investigated by hydrolysis of the unreduced protein with trypsin. The
resulting peptides were purified by gel filtration, paper electrophoresis,
and paper chromatography. Determination of the amino acid compositions of
the purified peptides demonstrated the existence of disulfide bonds linking
half-cystine residues 17 and 38, 23 and 34, and 48 and 61.