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.2012 Sep 7;5(1):68.
doi: 10.1186/1754-6834-5-68.

Proteomic analysis reveals resistance mechanism against biofuel hexane in Synechocystis sp. PCC 6803

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Proteomic analysis reveals resistance mechanism against biofuel hexane in Synechocystis sp. PCC 6803

Jie Liu et al. Biotechnol Biofuels..

Abstract

Background: Recent studies have demonstrated that photosynthetic cyanobacteria could be an excellent cell factory to produce renewable biofuels and chemicals due to their capability to utilize solar energy and CO2 as the sole energy and carbon sources. Biosynthesis of carbon-neutral biofuel alkanes with good chemical and physical properties has been proposed. However, to make the process economically feasible, one major hurdle to improve the low cell tolerance to alkanes needed to be overcome.

Results: Towards the goal to develop robust and high-alkane-tolerant hosts, in this study, the responses of model cyanobacterial Synechocystis PCC 6803 to hexane, a representative of alkane, were investigated using a quantitative proteomics approach with iTRAQ - LC-MS/MS technologies. In total, 1,492 unique proteins were identified, representing about 42% of all predicted protein in the Synechocystis genome. Among all proteins identified, a total of 164 and 77 proteins were found up- and down-regulated, respectively. Functional annotation and KEGG pathway enrichment analyses showed that common stress responses were induced by hexane in Synechocystis. Notably, a large number of transporters and membrane-bound proteins, proteins against oxidative stress and proteins related to sulfur relay system and photosynthesis were induced, suggesting that they are possibly the major protection mechanisms against hexane toxicity.

Conclusion: The study provided the first comprehensive view of the complicated molecular mechanism employed by cyanobacterial model species, Synechocystis to defend against hexane stress. The study also provided a list of potential targets to engineer Synechocystis against hexane stress.

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Figures

Figure 1
Figure 1
Effects of hexane.Growth time courses with varying concentration of hexane.
Figure 2
Figure 2
Distribution, coverage, and functional category of proteins identified in this study. A)Distribution of protein identified among different molecular weights;B)Coverage of proteins by the identified peptides;C) Functional category coverage of the proteins identified.
Figure 3
Figure 3
Reproducibility of proteomic analysis. I) Reproducibility between biological replicates. Hexane-treated biological replicates at 24 h (A) and 48 h (B), respectively.II) Distribution of iTRAQ log ratios of the 1181 and 1172 proteins identified at 24 h (A) and 48 h (B) among four biological replicates, respectively. The four sets of biological replicates at 24 h were Hexane-24 h-r1vs.Control-24 h-r1, Hexane-24 h-r2vs.Control-24 h-r1, Hexane-24 h-r1vs.Control-24 h-r2, and Hexane-24 h-r2vs.Control-24 h-r2, indicated by different colors. The four sets of biological replicates at 48 h were Hexane-48 h-r1vs. Control-48 h-r1, Hexane-48 h-r2vs.Control-48 h-r1, Hexane-48 h-r1vs. Control-48 h-r2, and Hexane-48 h-r2vs.Control-48 h-r2, indicated by different colors.
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