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Abstract
<p class="first" id="P1">Dimeric indole alkaloids are structurally diverse natural
products that have attracted
significant attention from the synthetic and biosynthetic communities. Here we describe
the characterization of a P450 monooxygenase CnsC from
<i>Penicillium</i> that catalyzes the heterodimeric coupling between two different
indole moieties,
tryptamine and aurantioclavine, to construct vicinal quaternary stereocenters and
yield the heptacyclic communesin scaffold. We show, using biochemical characterization,
substrate analogs, and computational methods, that CnsC not only catalyzes the C3-C3
carbon-carbon bond formation, but also controls the regioselectivities of the pair
of subsequent aminal bond formations to yield the communesin core. The use of ω-
<i>N</i>-methyltryptamine and tryptophol in place to tryptamine led to the enzymatic
synthesis
of isocommunesin compounds, which have not been isolated to date.
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