Biosynthesis of Lycosantalonol, a cis-Prenyl Derived Diterpenoid

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2014-01-01
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Zi, Jiachen
Matsuba, Yuki
Hong, Young
Jackson, Alana
Tantillo, Dean
Pichersky, Eran
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Peters, Reuben
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Terpenoid natural products are generally derived from isoprenyl diphosphate precursors with trans double-bond configuration, and no diterpenoid derived from the cisoid precursor (Z,Z,Z)-nerylneryl diphosphate (1) has yet been identified. Here further investigation of a terpenoid biosynthetic gene cluster from tomato is reported, which resulted in identification of a biosynthetic pathway from 1, in a pathway featuring a number of interesting transformations. Compound 1 is first cyclized to a tricyclene core ring structure analogous to that found in α-santalene, with the resulting diterpene termed here lycosantalene (2). Quantum chemical calculations indicate a role for the diphosphate anion coproduct in this cyclization reaction. Subsequently, the internal cis double bond of the neryl side chain in 2 is then further transformed to an α-hydroxy ketone moiety via an epoxide intermediate (3). Oxygen labeling studies indicate 3 undergoes oxidative conversion to lycosantalonol (4). Thus, in addition to elucidating the cisoid origins of 4, this work has further provided mechanistic insight into the interesting transformations required for its production.

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Reprinted (adapted) with permission from Journal of the American Chemical Society 136 (2014): 16951, doi:10.1021/ja508477e. Copyright 2014 American Chemical Society.

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Wed Jan 01 00:00:00 UTC 2014
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