Gliotoxin Analogues from
a Marine-Derived Fungus, <i>Penicillium</i> sp., and Their
Cytotoxic and Histone Methyltransferase
Inhibitory Activities
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Abstract
Seven gliotoxin-related compounds were isolated from
the fungus <i>Penicillium</i> sp. strain JMF034, obtained
from deep sea sediments
of Suruga Bay, Japan. These included two new metabolites, bis(dethio)-10a-methylthio-3a-deoxy-3,3a-didehydrogliotoxin
(<b>1</b>) and 6-deoxy-5a,6-didehydrogliotoxin (<b>2</b>), and five known metabolites (<b>3</b>–<b>7</b>). The structures of the new compounds were elucidated by analysis
of spectroscopic data and the application of the modified Mosher’s
analysis. All of the compounds exhibited cytotoxic activity, whereas
compounds containing a disulfide bond showed potent inhibitory activity
against histone methyltransferase (HMT) G9a. None of them inhibited
HMT SET7/9