Caister Academic Press

Cloning and Partial Characterization of an Extracellular Dextransucrase Coding Region (DSR-V) from Leuconostoc citreum M-3

Reinaldo H. Fraga Vidal, Sandra Pacios Michelena, Roberto C. Arísticas Ribalta, Lisandra Martínez Valdés, Meinardo Lafargue Gámez, Amanda Montes Alvarez, Magali Remaud-Siméon and Pierre Monsan
from: Microbial Exopolysaccharides: Current Research and Developments (Edited by: Özlem Ateş Duru). Caister Academic Press, U.K. (2019) Pages: 295-314.


The dextransucrase enzymes synthesize dextran, a glucose polymer with broad industrial applications, making the search for new dextransucrases of great interest. The work described aimed at the partial characterizing of a recombinant dextransucrase enzyme from Leuconostoc citreum M-3. From the genomic DNA of strain M-3, an amplicon containing a coding region of a dextransucrase called DSR-V was isolated, and deposited in the GenBankTM (Accession number: KF724950). The amino acid sequence alignment of DSR-V with other dextransucrases demonstrated that it shares a 94% identity with the DSR-D of L. mesenteroides Lcc4 and the DSR-S of L. mesenteroides NRRL B-512F. The DSR-V was cloned and expressed in Escherichia coli JM109 facilitating the formation and detection of DSR-V specific dextran. The SDS-PAGE soluble fraction zymography of E. coli DSR-V and the 13C-NMR spectra of dextran polymers synthesized by this clone confirm that L. citreum M-3 dsrV gene codes for a different dextransucrase synthesizing linear dextrans with mainly α(1-6) linkages read more ...
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