Molecular Characterization of DSR-E, an α-1,2 Linkage-Synthesizing Dextransucrase with Two Catalytic Domains - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Bacteriology Année : 2002

Molecular Characterization of DSR-E, an α-1,2 Linkage-Synthesizing Dextransucrase with Two Catalytic Domains

Résumé

ABSTRACT A novel Leuconostoc mesenteroides NRRL B-1299 dextransucrase gene, dsrE , was isolated, sequenced, and cloned in Escherichia coli , and the recombinant enzyme was shown to be an original glucansucrase which catalyses the synthesis of α-1,6 and α-1,2 linkages. The nucleotide sequence of the dsrE gene consists of an open reading frame of 8,508 bp coding for a 2,835-amino-acid protein with a molecular mass of 313,267 Da. This is twice the average mass of the glucosyltransferases (GTFs) known so far, which is consistent with the presence of an additional catalytic domain located at the carboxy terminus of the protein and of a central glucan-binding domain, which is also significantly longer than in other glucansucrases. From sequence comparison with family 70 and α-amylase enzymes, crucial amino acids involved in the catalytic mechanism were identified, and several original sequences located at some highly conserved regions in GTFs were observed in the second catalytic domain.

Dates et versions

hal-04151227 , version 1 (04-07-2023)

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Sophie Bozonnet, Marguerite Dols-Laffargue, Emeline Fabre, Sandra Pizzut, Magali Remaud-Simeon, et al.. Molecular Characterization of DSR-E, an α-1,2 Linkage-Synthesizing Dextransucrase with Two Catalytic Domains. Journal of Bacteriology, 2002, 184 (20), pp.5753 - 5761. ⟨10.1128/jb.184.20.5753-5761.2002⟩. ⟨hal-04151227⟩
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