Acanthaster planci

Scheme 9 The major saponin from the sea star Acanthaster planci...

Importantly, Lindquist et al.53 also document that ascidians can exhibit chemical differences between defensive secondary metabolites among adults and larvae. For example, larvae from colonies of Sigillina cf. signifera contained more tambjamine C, less tambjamine E, and no tambjamine F as compared to adults.65 Moreover, larvae of Trididemnum solidum contain only four of the six didemnins found in adults.53 This could be the result of different selective pressures during planktonic vs. benthic life history phases. In contrast, Lucas et al.44 found no differences in the saponin chemical defenses of the embryos, larvae, and adults of the sea star Acanthaster planci. Clearly, additional studies are needed to expand the evaluation of ontogenetic shifts in defensive chemistry in marine organisms. 

Acanthaster planci Larva Planktotrophic anemone, amphipod Fish 44... 

Lucas, J.S., Hart, R.J., Howden, M.E., and Salathe R., Saponins in eggs and larvae of Acanthaster planci (L.) (Asteroidea) as chemical defenses against planktivorous fish, J. Exp. Mar. Biol. Ecol., 40, 155, 1979. 

Lucas, J.S., Environmental influences on the early development of Acanthaster planci (L.), in Crown-of-Thorns Starfish Seminar Proceedings, Brisbane, September 6, 1974, Australian Government Public Service, Canberra, 1975, 109. 

Larkum, A. W. D., High rates of nitrogen fixation on coral skeletons after predation by the crown of thorns starfish Acanthaster planci, Mar. Biol., 97, 503, 1988. 

Fig. (2). Structure of asterosaponins from the starfishes Acanthaster planci, Labidiaster annulatus, Luidia quinaria and Psilaster cassiope...

Acanthasterol [82] (acansterol) [83,84] (72), the isomer of gorgosterol, was isolated from Acanthaster planci by Scheuer. Gorgostanol [85] and demethyl-acanthasterol (73) [86] were also found in A. planci [86] (Fig. 8). Transformation from A - to A -sterol may be a common bioconversion in Echinodermata, because gorgonians are components of the diet of A. planci in which gorgosterol cannot be found. 

They also reported the synthesis of acanthacerebroside A33 134, which was isolated from the starfish Acanthaster planci.34 DCC-mediated condensation of 129 and (R)-2-acetoxytetradocosanoic acid 130 afforded the ceramide monoacetate 131. The glycosidation of 131 with 2,3,4,6-tetra-O acetyl-p-D-glucopyranosyl bromide 132 in the presence of silver triflate and molecular sieves gave a mixture of the p-monoglycoside 133 and a diglycoside in 37 and 15% yield, respectively. Hydrolysis of 133 yielded acanthacerebroside A 134. 

Palytoxin-like materials have been identified in polychaete worms (Hermodice carmculata) and starfish (Acanthaster planci) that feed on zoanthids, and in sponges, crustaceans, and gorgonians living in close proximity to Palythoa colonies [30-32]. 

The pentamer with X = a-L-Fuc-(l- 3), an antigen involved in the hyperacute rejection of xenotransplants, has been synthesized, and a related pentamer, p-L-Fuc/ -(l- 4)-a-D-Gal-(1 4)-a-NeuNAc(2- 3)-p-D-Gal-(l- 4)-Glc has been isolated from the starfish Acanthaster planci ... 

MELTING point Diacctate, 158-1 59°C organism Acanthaster planci lArm. 

MELTING point Diacetate, 147-148°C organism Acanthaster planci lAnn. 

SPECTRAL data Mass Spec organism Acanthaster planci Linn. 

Ganglioside AG-2, which was isolated from the starfish Acanthaster planci, has also an unusual glycan sequence (pentasaccharide) involving an iimer sialic acid... 

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