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| Content Provider | PubMed Central |
|---|---|
| Author | Delangle, Aurélie Prouvost, Anne-france Cogez, Virginie Jean-pierre, Bohin Lacroix, Jean-marie Cotte-pattat, Nicole Hugouvieux |
| Copyright Year | 2007 |
| Abstract | β-1,4-Galactan is a major component of the ramified regions of pectin. Analysis of the genome of the plant pathogenic bacteria Erwinia chrysanthemi revealed the presence of a cluster of eight genes encoding proteins potentially involved in galactan utilization. The predicted transport system would comprise a specific porin GanL and an ABC transporter made of four proteins, GanFGK2. Degradation of galactans would be catalyzed by the periplasmic 1,4-β-endogalactanase GanA, which released oligogalactans from trimer to hexamer. After their transport through the inner membrane, oligogalactans would be degraded into galactose by the cytoplasmic 1,4-β-exogalactanase GanB. Mutants affected for the porin or endogalactanase were unable to grow on galactans, but they grew on galactose and on a mixture of galactotriose, galactotetraose, galactopentaose, and galactohexaose. Mutants affected for the periplasmic galactan binding protein, the transporter ATPase, or the exogalactanase were only able to grow on galactose. Thus, the phenotypes of these mutants confirmed the functionality of the gan locus in transport and catabolism of galactans. These mutations did not affect the virulence of E. chrysanthemi on chicory leaves, potato tubers, or Saintpaulia ionantha, suggesting an accessory role of galactan utilization in the bacterial pathogeny. |
| Related Links | http://dx.doi.org/10.1128/jb.00845-07 |
| Ending Page | 7061 |
| Page Count | 9 |
| Starting Page | 7053 |
| File Format | |
| ISSN | 00219193 |
| e-ISSN | 10985530 |
| Journal | Journal of Bacteriology |
| Issue Number | 19 |
| Volume Number | 189 |
| Language | English |
| Publisher | American Society for Microbiology |
| Publisher Date | 2007-10-01 |
| Access Restriction | Open |
| Rights Holder | American Society for Microbiology |
| Subject Keyword | Molecular Biology Microbiology Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Molecular Biology Microbiology |
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