Background: Rising costs and a depleting supply of oil, as well as environmental concerns,
have led to strong interest in renewable fuels and chemicals. In the last decade, there was considerable
interest for microbial production of biofuels by metabolic engineering approach as an attractive alternative
to transportation fuels. This review is aimed to provide details of different biosynthetic pathways
for microbial production of biofuels.
Methods: Recent advancements of synthetic biology have led to the further development of genetic
engineering of microorganism, which has been great motivation for developing strategy for microbial
production of biofuels. Rational design of metabolism is very important for production of biofuels. In silico prediction of
metabolic flux distribution of the metabolic pathways enabled us to decide the time consuming steps in metabolic engineering.
Results: In recent years significant efforts have been made to engineer microorganisms to produce bioethanol, higher
chain alcohols, fatty acids and isoprenoid based biodiesel. Metabolic engineering involves improvement of biofuels formation
through the modification of specific genes or addition new genes involved in biochemical reactions with the use of
recombinant DNA technology. System-level approach to analyze and engineer metabolism based on flux distributions obtained
from metabolomics and 13C metabolic flux analysis have been extensively used to produce biofuels in Escherichia
coli and yeast.
Conclusion: The biofuels obtained from microorganisms can be used as renewable resource for gasoline, diesel and jet
fuel. The development of renewable bioenergy will significantly reduce our dependence on fossil fuels for elegantly safer