Glucose and arabinose dependent mineral phosphate solubilization and its succinate-mediated catabolite repression in Rhizobium sp. RM and RS
| Autor: | Ekta Joshi, Shalini Rajkumar, Bhagya Iyer |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Catabolite Repression
0106 biological sciences 0301 basic medicine Arabinose Succinic Acid Catabolite repression Bioengineering Gluconates 01 natural sciences Applied Microbiology and Biotechnology Phosphates 03 medical and health sciences chemistry.chemical_compound Glucose dehydrogenase 010608 biotechnology Psychological repression Quinoprotein glucose dehydrogenase chemistry.chemical_classification Phosphate Glucose 030104 developmental biology Enzyme chemistry Biochemistry Gluconic acid Oxidoreductases Rhizobium Biotechnology |
| Zdroj: | Journal of Bioscience and Bioengineering. 128:551-557 |
| ISSN: | 1389-1723 |
| Popis: | Rhizobium sp. RM and RS are Vigna radiata root nodule isolates with the ability to solubilize tricalcium phosphate and rock phosphate under 50 mM Tris-Cl buffering conditions. Rhizobium sp. RM and RS were unique as they could produce two different organic acids, gluconic acid and oxalic acid using glucose and arabinose, respectively, which are two of the most prominent sugars present in the rhizospheric soil. However, P solubilization in these isolates was repressed in the presence of succinate resembling the phenomenon of catabolite repression. RM and RS produced 24 mM and 20 mM gluconic acid in presence of glucose which was repressed to 10 mM and 8 mM, respectively, in glucose + succinate conditions. Similarly, RM and RS produced 28 mM and 23 mM oxalic acid in arabinose containing media which was repressed to 9 mM and 8 mM, respectively, in the presence of arabinose + succinate. Results of enzyme activities indicated 66% repression of quinoprotein glucose dehydrogenase in glucose + succinate compared to glucose grown cells and 84% repression of glyoxylate oxidase in arabinose + succinate compared to arabinose grown cells. This is perhaps the first report on mechanism of P solubilization in rhizobia through utilization of two different sugars, glucose and arabinose and its repression by succinate. Succinate-mediated catabolite repression of arabinose is the unique aspect of this study. |
| Databáze: | OpenAIRE |
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