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Structural insight on assembly-line catalysis in terpene biosynthesis

Journal Article · · Nature Communications
 [1];  [2];  [2];  [2];  [3];  [3];  [4]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemistry. Roy and Diana Vagelos Labs.; OSTI
  2. Univ. of Pennsylvania, Philadelphia, PA (United States). Perelman School of Medicine. Dept. of Biochemistry and Biophysics; Univ. of Pennsylvania, Philadelphia, PA (United States). Perelman School of Medicine. Biochemistry and Molecular Biophysics Graduate Group
  3. Univ. of Pennsylvania, Philadelphia, PA (United States). Perelman School of Medicine. Dept. of Biochemistry and Biophysics
  4. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemistry. Roy and Diana Vagelos Labs.
Fusicoccadiene synthase from Phomopsis amygdali (PaFS) is a unique bifunctional terpenoid synthase that catalyzes the first two steps in the biosynthesis of the diterpene glycoside Fusicoccin A, a mediator of 14-3-3 protein interactions. The prenyltransferase domain of PaFS generates geranylgeranyl diphosphate, which the cyclase domain then utilizes to generate fusicoccadiene, the tricyclic hydrocarbon skeleton of Fusicoccin A. Here, we use cryo-electron microscopy to show that the structure of full-length PaFS consists of a central octameric core of prenyltransferase domains, with the eight cyclase domains radiating outward via flexible linker segments in variable splayed-out positions. Cryo-electron microscopy and chemical crosslinking experiments additionally show that compact conformations can be achieved in which cyclase domains are more closely associated with the prenyltransferase core. This structural analysis provides a framework for understanding substrate channeling, since most of the geranylgeranyl diphosphate generated by the prenyltransferase domains remains on the enzyme for cyclization to form fusicoccadiene.
Sponsoring Organization:
National Cancer Institute; National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1816540
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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