Structural insight on assembly-line catalysis in terpene biosynthesis
Journal Article
·
· Nature Communications
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemistry. Roy and Diana Vagelos Labs.; OSTI
- 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
- Univ. of Pennsylvania, Philadelphia, PA (United States). Perelman School of Medicine. Dept. of Biochemistry and Biophysics
- 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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