Abstract
In this study, we show the proof of concept for the production of defined oligo-isoprenoids with terminal functional groups that can be used as starting materials for various purposes including the synthesis of isoprenoid-based plastics. To this end, we used three types of rubber oxygenases for the enzymatic cleavage of rubber [poly(cis-1,4-isoprene)]. Two enzymes, rubber oxygenase RoxA(X)(sp) and rubber oxygenase RoxB(X)(sp) , originate from Xanthomonas sp. 35Y; the third rubber oxygenase, latex-clearing protein (Lcp(K30) ), is derived from Gram-positive rubber degraders such as Streptomyces sp. K30. Emulsions of polyisoprene (latex) were treated with RoxA(X)(sp) , RoxB(X)(sp) , Lcp(K30) or with combinations of the three proteins. The cleavage products were purified by solvent extraction and FPLC separation. All products had the same general structure with terminal functions (CHO-CH(2) - and -CH(2) -COCH(3) ) but differed in the number of intact isoprene units in between. The composition and m/z values of oligo-isoprenoid products were determined by HPLC-MS analysis. Our results provide a method for the preparation of reactive oligo-isoprenoids that can likely be used to convert polyisoprene latex or rubber waste materials into value-added molecules, biofuels, polyurethanes or other polymers.