Hypocrellin A (HA) is a perylenequinone (PQ) isolated from
Shiraia bambusicola that shows antiviral and antitumor activities,
but its application is limited by the low production
from wild fruiting body. A gene overexpressing method was
expected to augment the production rate of HA in S. bambusicola.
However, the application of this molecular biology
technology in S. bambusicola was impeded by a low genetic
transformation efficiency and little genomic information. To
enhance the plasmid transformant ratio, the Polyethylene
Glycol-mediated transformation system was established and
optimized. The following green fluorescent protein (GFP)
analysis showed that the gene fusion expression system we
constructed with a GAPDH promoter Pgpd1 and a rapid 2A
peptide was successfully expressed in the S. bambusicola S4201
strain. We successfully obtained the HA high-producing strains
by overexpressing O-methyltransferase/FAD-dependent monooxygenase
gene (mono) and the hydroxylase gene (hyd),
which were the essential genes involved in our putative HA
biosynthetic pathway. The overexpression of these two genes
increased the production of HA by about 200% and 100%,
respectively. In general, this study will provide a basis to identify
the genes involved in the hypocrellin A biosynthesis. This
improved transformation method can also be used in genetic
transformation studies of other fungi.
Citations
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Optimisation of hypocrellin production in
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