Nk. Gulavita et al., ISOLATION AND STRUCTURE ELUCIDATION OF PERTHAMIDE-B, A NOVEL PEPTIDE FROM THE SPONGE THEONELLA SP, Tetrahedron letters, 35(37), 1994, pp. 6815-6818
A sponge of the genus Theonella collected off Perth, Australia, contai
ned a cyclic octapeptide. perthamide B, which weakly inhibited the bin
ding of [I-125]IL-1 beta to intact EL4.6.1 cells with an IC50 of 27.6
mu M. The inhibition of binding could however, not be separated from t
he cytotoxic effects of perthamide B. The structure was elucidated by
spectroscopic methods.