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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

GltS, the sodium-coupled L-glutamate uptake system of Corynebacterium glutamicum: identification of the corresponding gene and impact on L-glutamate production.

A screening procedure was established to identify Corynebacterium glutamicum transposon mutants with an altered L-glutamate excretion behaviour. By this microtiter plate-based approach seven non- or less excreting C. glutamicum strains and two hyper-excreters were found. The subsequently carried out molecular analysis of a hyper-producing clone led to the identification of the gltS gene, which codes for the sodium-coupled secondary L-glutamate uptake system in C. glutamicum. Characterization of a gltS deletion strain revealed that this transporter has a weak but significant impact on L-glutamate production induced by biotin limitation in the wild type. Obviously, GltS leads to the re-uptake of excreted L-glutamate causing a futile cycle. In accord with this hypothesis, the overexpression of gltS decreased L-glutamate production.[1]

References

  1. GltS, the sodium-coupled L-glutamate uptake system of Corynebacterium glutamicum: identification of the corresponding gene and impact on L-glutamate production. Trötschel, C., Kandirali, S., Diaz-Achirica, P., Meinhardt, A., Morbach, S., Krämer, R., Burkovski, A. Appl. Microbiol. Biotechnol. (2003) [Pubmed]
 
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