| Titel:
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NADPH-dependent glutamate dehydrogenase in Penicillium chrysogenum is involved in regulation of beta-lactam production |
| Type:
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Journal articleJournal article |
| Person(er):
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Technical University of Denmark
Email:
Technical University of Denmark
Email:
Forfatter:
Noorman, H.
Technical University of Denmark
Technical University of Denmark
Email:
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| Uddrag:
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The interactions between the ammonium assimilatory pathways and beta-lactam production were investigated by disruption of the NADPH-dependent glutamate dehydrogenase gene (gdhA) in two industrial beta-lactam-producing strains of Penicillium chrysogenum. The strains used were an adipoyl-7-ADCA- and a penicillin-producing strain. The gdhA gene disruption caused a decrease in maximum specific growth rate of 26 % and 35 % for the adipoyl-7-ADCA-producing strain and the penicillin-producing strain, respectively, compared to the corresponding reference strains. Interestingly, no beta-lactam production was detected in either of the Delta gdhA strains. Supplementation with glutamate restored growth but no beta-lactam production was detected for the constructed strains. Cultures with high ammonium concentrations (repressing conditions) and with proline as nitrogen source (de-repressed conditions) showed continued beta-lactam production for the reference strains whereas the Delta gdhA strains remained non-productive under all conditions. By overexpressing the NAD-dependent glutamate dehydrogenase, the specific growth rate could be restored, but still no beta-lactam production was detected. The results indicate that the NADPH-dependent glutamate dehydrogenase may be directly or indirectly involved in the regulation of beta-lactann production in industrial strains of P. chrysogenum. |
| Publiceret:
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in journal: Microbiology (ISSN: 1350-0872) (DOI: http://dx.doi.org/10.1099/mic.0.2007/010017-0), vol: 154, pages: 1242-1250, 2008 |
| DOI:
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