Abstract
1. 1. Doubly labeled cyanide ( 13C 15N), and [ 14C]cyanide were incorporated intact by the sponge Ciocalypta sp. into the isocyano group of the pupukeananes ( 6 and 7) and [ 14C]cyanide into kalihinol-F isolated from Acanthella sp., thereby extending an earlier observation of [ 14C]cyanide uptake by Amphimedon sp. into diisocyanoadociane. 2. 2. Low or no incorporation of several labeled amino acids may suggest specificity of certain amino acids, as yet unknown, to form cyanide. 3. 3. The uptake of cyanide ion by sponges appears to be enzyme-mediated. In the case of the kalihinols ( 9, 10) and isokalihinols carbocation-like intermediates are plausible. 4. 4. Labeled terpene precursors are perhaps used competitively by symbionts to produce carotenoids rather than being incorporated into isocyanoterpenoids, e.g. diisocyanoadociane, in Amphimedon sp.
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