The role of dextran production in the metabolic context of Leuconostoc and Weissella Tunisian strains
2021
Besrour-Aouam, Norhane | Fhoula, Imene | Hernández-Alcántara, Annel M. | Mohedano Bonillo, Mari Luz | Najjari, Afef | Prieto Orzanco, Alicia | Ruas-Madiedo, Patricia | López García, Paloma | Ouzari, Hadda-Imene | Ministerio de Ciencia, Innovación y Universidades (España) | Agencia Estatal de Investigación (España) | Ministère de l’Enseignement Supérieur et de la Recherche Scientifique (Tunisie)
High molecular weight dextrans improve the rheological properties of fermented products and have immunomodulatory and antiviral activity. We report on 5.84 × 10–2.61 × 10 Da dextrans produced by Leuconostoc lactis AV1n, Weissella cibaria AV2ou and Weissella confusa V30 and FS54 strains. Dextransucrases catalyze dextran synthesis by sucrose hydrolysis concomitant with fructose generation. The four bacteria have dextransucrases with molecular weight of about 160 kDa detected by zymograms. Each bacterium showed different interplay of dextran production and metabolic fluxes. All bacteria produced lactate, and AV2ou apart, synthesized mannitol from fructose. FS54 hydrolyzed dextran blue and the concentration of dextran produced by this bacterium decreased during the stationary phase. The AV1n binding to Caco-2 cells and polystyrene plates was higher under conditions for dextran synthesis. Thus, this is the first instance of a Weissella dextranase, associated with a dextransucrase ability, and of a positive influence of dextran on adhesion and aggregation properties of a bacterium.
Afficher plus [+] Moins [-]This work was supported by the Spanish Ministry of Science, Innovation and Universities (grant RTI2018-097114-B-I00) and the TunisianMinistry of Higher Education and Scientific research.
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