Manipulation of carbon flux into fatty acid biosynthesis pathway in Dunaliella salina using AccD and ME genes to enhance lipid content and to improve produced biodiesel quality

Ahmad Farhad Talebi, Masoud Tohidfar, Abdolreza Bagheri, Stephen R. Lyon, Kourosh Salehi-Ashtiani, Meisam Tabatabaei

Research output: Contribution to journalArticle

Abstract

Advanced generations of biofuels basically revolve around non-agricultural energy crops. Among those, microalgae owing to its unique characteristics i.e. natural tolerance to waste and saline water, sustainable biomass production and high lipid content (LC), is regarded by many as the ultimate choice for the production of various biofuels such as biodiesel. In the present study, manipulation of carbon flux into fatty acid biosynthesis pathway in Dunaliella salina was achieved using pGH plasmid harboring AccD and ME genes to enhance lipid content and to improve produced biodiesel quality. The stability of transformation was confirmed by PCR after several passages. Southern hybridization of AccD probe with genomic DNA revealed stable integration of the cassette in the specific positions in the chloroplast genome with no read through transcription by endogenous promoters. Comparison of the LC and fatty acid profile of the transformed algal cell line and the control revealed the over-expression of the ME/AccD genes in the transformants leading to 12% increase in total LC and significant improvements in biodiesel properties especially by increasing algal oil oxidation stability. The whole process successfully implemented herein for transforming algal cells by genes involved in lipid production pathway could be helpful for large scale biodiesel production from microalgae.

Original languageEnglish (US)
Pages (from-to)91-97
Number of pages7
JournalBiofuel Research Journal
Volume1
Issue number3
DOIs
StatePublished - Jan 1 2014

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Keywords

  • Biodiesel
  • Carbon flux manipulation
  • Chloroplast
  • Genetic engineering
  • Microalgae

ASJC Scopus subject areas

  • Biotechnology
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology

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