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Title: A squalene synthase-like enzyme initiates production of tetraterpenoid hydrocarbons in Botryococcus braunii Race L

Abstract

Here, the green microalga Botryococcus braunii is considered a promising biofuel feedstock producer due to its prodigious accumulation of hydrocarbon oils that can be converted into fuels. B. braunii Race L produces the C40 tetraterpenoid hydrocarbon lycopadiene via an uncharacterized biosynthetic pathway. Structural similarities suggest this pathway follows a biosynthetic mechanism analogous to that of C30 squalene. Confirming this hypothesis, the current study identifies C20 geranylgeranyl diphosphate (GGPP) as a precursor for lycopaoctaene biosynthesis, the first committed intermediate in the production of lycopadiene. Two squalene synthase (SS)-like complementary DNAs are identified in race L with one encoding a true SS and the other encoding an enzyme with lycopaoctaene synthase (LOS) activity. Interestingly, LOS uses alternative C15 and C20 prenyl diphosphate substrates to produce combinatorial hybrid hydrocarbons, but almost exclusively uses GGPP in vivo. In conclusion, this discovery highlights how SS enzyme diversification results in the production of specialized tetraterpenoid oils in race L of B. braunii.

Authors:
 [1];  [2];  [3];  [3];  [4];  [5];  [1]
  1. Texas A&M Univ., College Station, TX (United States). Dept. of Biochemistry and Biophysics
  2. Texas A&M Univ., College Station, TX (United States). Dept. of Biochemistry and Biophysics; Texas A&M Univ., College Station, TX (United States). Biomolecular NMR Laboratory
  3. Univ. of Tokyo (Japan); Japan Science and Technology Agency-Core Research for Evolutional Science and Technology (CREST), Tokyo (Japan)
  4. Univ. of Arizona, Tucson, AZ (United States)
  5. Univ. of Arizona, Tucson, AZ (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Research Org.:
Texas A&M AgriLife Research, College Station, TX (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Contributing Org.:
Texas A&M AgriLife Research
OSTI Identifier:
1255082
Grant/Contract Number:  
AR0000203; EE0003046l; NSF-EFRI-PSBR 1240478
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; biological sciences; biochemistry; chemical biology; plant sciences

Citation Formats

Thapa, Hem R., Naik, Mandar T., Okada, Shigeru, Takada, Kentaro, Molnar, Istvan, Xu, Yuquan, and Devarenne, Timothy P. A squalene synthase-like enzyme initiates production of tetraterpenoid hydrocarbons in Botryococcus braunii Race L. United States: N. p., 2016. Web. doi:10.1038/ncomms11198.
Thapa, Hem R., Naik, Mandar T., Okada, Shigeru, Takada, Kentaro, Molnar, Istvan, Xu, Yuquan, & Devarenne, Timothy P. A squalene synthase-like enzyme initiates production of tetraterpenoid hydrocarbons in Botryococcus braunii Race L. United States. https://doi.org/10.1038/ncomms11198
Thapa, Hem R., Naik, Mandar T., Okada, Shigeru, Takada, Kentaro, Molnar, Istvan, Xu, Yuquan, and Devarenne, Timothy P. Wed . "A squalene synthase-like enzyme initiates production of tetraterpenoid hydrocarbons in Botryococcus braunii Race L". United States. https://doi.org/10.1038/ncomms11198. https://www.osti.gov/servlets/purl/1255082.
@article{osti_1255082,
title = {A squalene synthase-like enzyme initiates production of tetraterpenoid hydrocarbons in Botryococcus braunii Race L},
author = {Thapa, Hem R. and Naik, Mandar T. and Okada, Shigeru and Takada, Kentaro and Molnar, Istvan and Xu, Yuquan and Devarenne, Timothy P.},
abstractNote = {Here, the green microalga Botryococcus braunii is considered a promising biofuel feedstock producer due to its prodigious accumulation of hydrocarbon oils that can be converted into fuels. B. braunii Race L produces the C40 tetraterpenoid hydrocarbon lycopadiene via an uncharacterized biosynthetic pathway. Structural similarities suggest this pathway follows a biosynthetic mechanism analogous to that of C30 squalene. Confirming this hypothesis, the current study identifies C20 geranylgeranyl diphosphate (GGPP) as a precursor for lycopaoctaene biosynthesis, the first committed intermediate in the production of lycopadiene. Two squalene synthase (SS)-like complementary DNAs are identified in race L with one encoding a true SS and the other encoding an enzyme with lycopaoctaene synthase (LOS) activity. Interestingly, LOS uses alternative C15 and C20 prenyl diphosphate substrates to produce combinatorial hybrid hydrocarbons, but almost exclusively uses GGPP in vivo. In conclusion, this discovery highlights how SS enzyme diversification results in the production of specialized tetraterpenoid oils in race L of B. braunii.},
doi = {10.1038/ncomms11198},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Wed Apr 06 00:00:00 EDT 2016},
month = {Wed Apr 06 00:00:00 EDT 2016}
}

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Cited by: 28 works
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Works referencing / citing this record:

De novo transcriptomic analysis of the oleaginous alga Botryococcus braunii AC768 (Chlorophyta)
journal, July 2018


Comparative transcriptome analyses of oleaginous Botryococcus braunii race A reveal significant differences in gene expression upon cobalt enrichment
journal, December 2018