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Expression of Corynebacterium glutamicum glycolytic genes varies with carbon source and growth phase

¹ Research Institute of Innovative Technology for the Earth, Kyoto 619-0292, Japan
² School of Life Sciences and Biotechnology, Korea University, Anam-dong, Sungbuk-gu, Seoul, Republic of Korea

Correspondence
Hideaki Yukawa
mmg-lab{at}rite.or.jp

A basic pattern of gene expression and of relative expression levels during different growth phases was obtained for Corynebacterium glutamicum R grown on different carbon sources. The gapA-pgk-tpi-ppc gene cluster was transcribed as a mono- or polycistronic mRNA, depending on the growth phase. The 1.4 kb (gapA) and 2.3 kb (pgk-tip) mRNAs were expressed in the early through late exponential phases, whereas the 3.7 kb (gapA-pgk-tpi) and 5.4 kb (pgk-tpi-ppc) mRNAs were only detected in the mid-exponential phase. All other glycolytic genes except pps, glk and pgi were transcribed as monocistronic mRNAs under all tested conditions. Identification and alignment of the promoter regions of the transcriptional start sites of glycolytic genes revealed strong similarities to the ^A consensus promoter sequences of Gram-positive bacteria. All genes involved in glycolysis were coordinately expressed in medium containing glucose. Growth in the presence of glucose gave rise to abundant expression of most glycolytic genes, with the level of gapA transcript being the highest. Glucose depletion led to a rapid repression of most glycolytic genes and a corresponding two- to fivefold increased expression of the gluconeogenic genes pps, pck and malE, which are induced by pyruvate, lactate, acetate and/or other organic acids.

The GenBank/EMBL/DDBJ accession numbers for the nucleotide sequences of C. glutamicum R glk, gpm, pfk, pgi, ptsG, fba, pps, eno, gapB, malE, pck, aceE and pgm are DQ248860–DQ248872; for tpi, gapA, pgk and ppc DQ248873; for pyk and lpd AP009044; and for pyc AB115090.

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