Identification of Xanthomonas campestris pv. campestris galactose utilization genes from transcriptome data.
A 70 mer oligonucleotide microarray was constructed to analyze genome-wide expression profiles of Xanthomonas campestris pv. campestris B100, a plant-pathogenic bacterium that is industrially employed to produce the exopolysaccharide xanthan gum which has many applications as a stabilizing, thickening, gelling, and emulsifying agent in food, pharmaceutical, and cosmetic industries. As an application example, global changes of gene expression were monitored during growth of X. campestris pv. campestris B100 on two different carbon sources. Exponential growing bacterial cultures were incubated either for 1h or permanently in minimal medium supplemented with 1% galactose in comparison to growth in minimal medium supplemented with 1% glucose. Six genes were identified that were significantly increased in gene expression under both growth conditions. These genes were located in three distinguished chromosomal regions in operon-like gene clusters. Genes from these clusters encode secreted glycosidases, which were predicted to be specific for galactose-containing carbohydrates, as well as transport proteins probably located in the outer and inner cell membrane. Finally genes from one cluster code for cytoplasmic enzymes of a metabolic pathway specific for the breakdown of galactose to intermediates of glycolysis.
Serrania
Javier
J
Institute for Genome Research and Systems Biology, Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany.
Vorhölter
Frank-Jörg
FJ
Niehaus
Karsten
K
Pühler
Alfred
A
Becker
Anke
A
D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D003470:Culture Media; D005690:Galactose / Q000378:metabolism* / Q000494:pharmacology; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects; D005798:Genes, Bacterial; D020411:Oligonucleotide Array Sequence Analysis; D011108:Polymers / Q000378:metabolism; D015203:Reproducibility of Results; D014158:Transcription, Genetic / Q000187:drug effects; D016959:Xanthomonas campestris / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development
D001426:Bacterial Proteins; D003470:Culture Media; D011108:Polymers; D005690:Galactose