Abstract
Clostridium cellulovorans, a cellulolytic bacterium producing butyric and acetic acids as main fermentation products, is a promising host for biofuel production from cellulose. However, the transformation method of C. cellulovorans was not available, hindering its genetic engineering. To overcome this problem, its restriction modification (RM) systems were analyzed and a novel in vivo methylation was established for its successful transformation in the present study. Specifically, two RM systems, Cce743I and Cce743II, were determined. R. Cce743I has the same specificity as LlaJI, recognizing 5′-GACGC-3′ and 5′-GCGTC-3′, while M. Cce743I methylates the external cytosine in the strand (5′-GACGmC-3′). R. Cce743II, has the same specificity as LlaI, recognizing 5′-CCAGG-3′ and 5′-CCTGG-3′, while M. Cce743II methylates the external cytosine of both strands. An in vivo methylation system, expressing M. Cce743I and M. Cce743II from C. cellulovorans in Escherichia coli, was then established to protect plasmids used in electrotransformation. Transformants expressing an aldehyde/alcohol dehydrogenase (adhE2), which converted butyryl-CoA to n-butanol and acetyl-CoA to ethanol, were obtained. For the first time, an effective transformation method was developed for metabolic engineering of C. cellulovorans for biofuel production directly from cellulose.
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Acknowledgments
This work was supported in part by the National Science Foundation STTR program (IIP-1026648), Advanced Research Projects Agency-Energy (DE-AR0000095), and the Department of Energy, EERE Bioenergy Technologies Incubator program (DE-EE0007005).
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Yang, X., Xu, M. & Yang, ST. Restriction modification system analysis and development of in vivo methylation for the transformation of Clostridium cellulovorans . Appl Microbiol Biotechnol 100, 2289–2299 (2016). https://doi.org/10.1007/s00253-015-7141-9
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DOI: https://doi.org/10.1007/s00253-015-7141-9