The discovery of a bacterium-fungus-plant interaction
occurring in the case of rice seedling blight provides an
interestingexampleofanevenmorecomplexsymbiotic-pathogenic
relationship. The toxic metabolite, rhizoxin (37; Scheme 8),
originally isolated from a Rhizopus fungus contaminating rice
seedlings, has actually been found to be produced by the
endo-symbiotic bacterial species, Burkholderia rhizoxina,
100,101
and the gene cluster encoding rhizoxin biosynthesis has been
identified.102 Rhizoxin has been reported to exhibit potent
anti-tumor activity, but its further development as an anticancer
drug has been precluded by toxicity problems.103
Isolation and large-scale fermentation of Burkholderia rhizoxina
in pure culture have resulted in a significantly elevated
(10× higher) production of rhizoxin as well as rhizoxin
analogues in considerably improved yields,101 and this may
have significant implications in development of agents with
improved pharmacological properties
The discovery of a bacterium-fungus-plant interaction
occurring in the case of rice seedling blight provides an
interestingexampleofanevenmorecomplexsymbiotic-pathogenic
relationship. The toxic metabolite, rhizoxin (37; Scheme 8),
originally isolated from a Rhizopus fungus contaminating rice
seedlings, has actually been found to be produced by the
endo-symbiotic bacterial species, Burkholderia rhizoxina,
100,101
and the gene cluster encoding rhizoxin biosynthesis has been
identified.102 Rhizoxin has been reported to exhibit potent
anti-tumor activity, but its further development as an anticancer
drug has been precluded by toxicity problems.103
Isolation and large-scale fermentation of Burkholderia rhizoxina
in pure culture have resulted in a significantly elevated
(10× higher) production of rhizoxin as well as rhizoxin
analogues in considerably improved yields,101 and this may
have significant implications in development of agents with
improved pharmacological properties
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