Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 78, Issue 16, Pages 5831-5838Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.01147-12
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Funding
- Key Project of the Chinese Academy of Sciences [KSCX2-EW-J-6]
- National Natural Science Foundation of China [31100074]
- Beijing Natural Science Foundation [5112023]
- Ministry of Science and Technology of China [2010ZX09401-403]
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Corynebacterium glutamicum is currently used for the industrial production of a variety of biological materials. Many available inducible expression systems in this species use lac-derived promoters from Escherichia coli that exhibit much lower levels of inducible expression and leaky basal expression. We developed an arabinose-inducible expression system that contains the L-arabinose regulator AraC, the P-BAD promoter from the araBAD operon, and the L-arabinose transporter AraE, all of which are derived from E. coli. The level of inducible P-BAD-based expression could be modulated over a wide concentration range from 0.001 to 0.4% L-arabinose. This system tightly controlled the expression of the uracil phosphoribosyltransferase without leaky expression. When the gene encoding green fluorescent protein (GFP) was under the control of P-BAD promoter, flow cytometry analysis showed that GFP was expressed in a highly homogeneous profile throughout the cell population. In contrast to the case in E. coli, P-BAD induction was not significantly affected in the presence of different carbon sources in C. glutamicum, which makes it useful in fermentation applications. We used this system to regulate the expression of the odhI gene from C. glutamicum, which encodes an inhibitor of alpha-oxoglutarate dehydrogenase, resulting in high levels of glutamate production (up to 13.7 mM) under biotin nonlimiting conditions. This system provides an efficient tool available for molecular biology and metabolic engineering of C. glutamicum.
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