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

被引:41
作者
Han, Sung Ok
Inui, Masayuki
Yukawa, Hideaki [1 ]
机构
[1] Res Inst Innovat Technol Earth, Kyoto 61902, Japan
[2] Korea Univ, Sch Life Sci & Biotechnol, Seoul 136701, South Korea
来源
MICROBIOLOGY-SGM | 2007年 / 153卷
关键词
D O I
10.1099/mic.0.2006/004366-0
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
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 (TA 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, jock and malE, which are induced by pyruvate, lactate, acetate and/or other organic acids.
引用
收藏
页码:2190 / 2202
页数:13
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