Offering surprises: TCA cycle regulation in Corynebacterium glutamicum

Trends Microbiol. 2007 Sep;15(9):417-25. doi: 10.1016/j.tim.2007.08.004. Epub 2007 Aug 30.


Corynebacterium glutamicum, a Gram-positive soil bacterium, is used for the production of l-glutamate and l-lysine, both of which are derived from intermediates of the tricarboxylic acid (TCA) cycle. Recent studies have revealed that this amphibolic pathway is subject to complex regulation not only at the transcriptional level, but also at the post-transcriptional level. The latter involves serine/threonine protein kinase G and its target protein OdhI. Depending on its phosphorylation state, OdhI inhibits the 2-oxoglutarate dehydrogenase complex. This new type of TCA cycle control will be reviewed here together with regulation at the level of gene expression.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Acetates / metabolism
  • Aconitate Hydratase / genetics
  • Amino Acid Sequence
  • Amino Acids / biosynthesis
  • Base Sequence
  • Citric Acid Cycle*
  • Corynebacterium glutamicum / metabolism*
  • Gene Expression Regulation, Bacterial
  • Ketoglutarate Dehydrogenase Complex / metabolism
  • Molecular Sequence Data
  • Phosphorylation
  • Transcription, Genetic


  • Acetates
  • Amino Acids
  • Ketoglutarate Dehydrogenase Complex
  • Aconitate Hydratase