Characterization of botryococcene synthase enzyme activity, a squalene synthase-like activity from the green microalga Botryococcus braunii, Race B

Shigeru Okada, Timothy P. Devarenne, Masahiro Murakami, Hiroki Abe, Joseph Chappell

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

The extracellular matrix of the alga Botryococcus braunii, Race B, consists mainly of botryococcenes, which have potential as a hydrocarbon fuel. Botryococcenes are structurally similar to squalene raising the possibility of a common enzyme for the biosynthesis of both. While B. braunii squalene synthase (SS) enzyme activity has been documented, botryococcene synthase (BS) enzyme activity has not been. In the current study, an assay for BS activity has been developed and used to show that many of the assay conditions for BS enzyme activity are similar to those of SS. However, SS enzyme activity is stimulated by Tween 80 while BS enzyme activity is inhibited. Moreover, BS enzyme activity was correlated with the accumulation of botryococcenes during a B. braunii culture growth cycle, which was distinctly different from the profile of SS enzyme activity. While the current results indicate a conservation of enzymological features amongst the BS and SS enzymes, raising the possibility of one enzyme capable of catalyzing both activities, they are also consistent with these two activities arising from separate and distinct enzymes.

Original languageEnglish
Pages (from-to)110-118
Number of pages9
JournalArchives of Biochemistry and Biophysics
Volume422
Issue number1
DOIs
StatePublished - Feb 1 2004

Bibliographical note

Funding Information:
This work was supported by a grant from the National Science Foundation (J.C.) and in part by a Grant-in-Aid from the Ministry of Education, Science, Sports and Culture of Japan (S.O). We also thank Professor Bob Houtz (University of Kentucky) for his support in carrying out the RuBisCO assays.

Keywords

  • Botryococcene synthase
  • Botryococcenes
  • Botryococcus braunii
  • Squalene
  • Squalene synthase

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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