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Volume 149, Issue 4

Molecular characterization and expression analysis of the dextransucrase DsrD of Lcc4 in homologous and heterologous cultures Free

Abstract

The gene encoding the dextransucrase DsrD from the industrial strain Lcc4 was isolated by PCR using degenerate primers recognizing conserved regions present in other dextransucrase-encoding genes from spp. and Southern blot analyses on total genomic DNA. N-terminal sequence analysis of the active protein recovered in the culture showed that the secreted protein of 165 kDa is devoid of a 42 aa prepeptide which is removed post-translationally, most likely by signal peptidase cleavage. Primer extension and Northern blot analysis identified a monocistronic mRNA with two transcription initiation sites. Expression of the dextransucrase DsrD was investigated in pH-controlled fed-batch cultures via Northern blot analysis and enzyme activity measurement during the experiments. Sucrose levels of 20 g l were shown to induce the DsrD biosynthesis around 10-fold. The combination of pH-controlled fed-batch fermentation and Northern analysis clearly showed that expression was related to the growth of the bacteria. was transferred to and expressed in MG1363. Controlled fed-batch cultures revealed that active dextransucrase was produced and secreted by the recombinant strain. The expression was independent of sucrose levels. These results show that dextransucrase can be efficiently expressed and secreted in a non-, heterologous host and is able to drive dextran synthesis.

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2003-04-01
2024-04-25
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Molecular characterization and expression analysis of the dextransucrase DsrD of Leuconostoc mesenteroides Lcc4 in homologous and heterologous Lactococcus lactis cultures
Microbiology 149, 973 (2003); https://doi.org/10.1099/mic.0.26029-0
/content/journal/micro/10.1099/mic.0.26029-0
/content/journal/micro/10.1099/mic.0.26029-0
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