Reaction(IUBMB) |
Cleavage of cis-1,4-polyisoprene polymers into a mixture of compounds, including a C20 compound ((4Z,8Z,12Z,16Z,20Z,24Z)-4,8,12,16,20,24-hexamethyl-28-oxononacosa-4,8,12,16,20,24-hexaenal), a C25 compound ((4Z,8Z,12Z,16Z,20Z)-4,8,12,16,20-pentamethyl-24-oxopentacosa-4,8,12,16,20-pentaenal), a C30 compound ((4Z,8Z,12Z,16Z)-4,8,12,16-tetramethyl-20-oxohenicosa-4,8,12,16-tetraenal), and larger isoprenologes such as C35, C40, C45, and higher analogues.
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Comment |
The enzyme catalyses the cleavage of the double bonds in natural and synthetic rubber, producing a mixture of C20, C25, C30, and higher oligo-isoprenoids with ketone and aldehyde groups at their ends. Two unrelated bacterial enzymes are known to possess this activity - the enzyme from Streptomyces sp. K30 (Lcp) contains a b-type cytochrome, while the enzyme from Xanthomonas sp. 35Y, (RoxB) contains two c-type cytochromes. Both enzymes attack the substrate at random locations, and are not able to cleave the C35 or smaller products into shorter fragments.
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