Abstract
The incorporation of radioactivity into the resistant biopolymers of the A and B races of Botryococcus braunii (PRB A and PRB B) was examined after feeding with oleic acid. The location of the label in the biopolymers was determined by pyrolysis and confirmed that PRB A and PRB B are biosynthesized via similar pathways. However, a large part of the exogeneous oleic acid is diverted towards the formation of non-isoprenoid hydrocarbons in the A race; due to this competition the incorporation yield, very high in PRB B, is much lower in PRB A. It also appears that two pools of oleic acid are implicated in PRB A and PRB B formation. Oleic acid plays a major role in the biosynthesis of such resistant materials, especially as precursor of the long hydrocarbon chains building up the polymeric network. Very long chain fatty acid derivatives, originating from oleic acid elongation, are probably involved as intermediates in the formation of these chains.
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