Sulfated exopolysaccharide produced by Labrenzia sp. PRIM-30, characterization and prospective applications

Isolation and characterization of halophilic bacteria producing exopolymers with emulsifying and antioxidant activities

“…A similar study of an exopolysaccharide from a halophilic bacteria Labrenzia sp. has also reported low equivalence values of ascorbic acid (Priyanka et al, 2014).The total antioxidant activities obtained in the present study were higher compared to the polymer produced by the extremely halophilic archaea Haloterrigena turkmenica (5mg/ml EPS equivalents 2 µg/ml of ascorbic acid) (Squillaci et al, 2016). The obtained data demonstrate the ability of the polymers to change the oxidation state of molecules which is one of the mechanisms responsible for free radical neutralization (Lü et al, 2010).…”

“…The antioxidant activity of these exopolymers may be due to their content in some functional groups such as sulfate that could be playing an important role in scavenging and chelation reactions (Qi et al, 2006;Rocha De Souza et al, 2007;Priyanka et al, 2014).…”

Roseibium litorale sp. nov., isolated from a tidal flat sediment and proposal for the reclassification of Labrenzia polysiphoniae as Roseibium polysiphoniae comb. nov.

“…Bacteria of the genus Roseibium are widely distributed in nature and have been isolated from diverse environments, such as the rhizosphere of the halophyte Arthrocnemum macrostachyum [9] and Suaeda maritima [10], marine rhodophyta [1] and dinoflagellate [2], sediments of the Baltic Sea, the Shark Bay [1] and the Bohai Sea [11], saline water of Dasugan Lake [12], seawater of the West Sea [2], freshwater of the Pearl River estuary [8] and Mediterranean oysters [13], clearly indicating their wide environmental adaptation. Some isolates of this genus can produce sulfated exopolysaccharide as a potential antioxidant molecule [14], cyclopropane-containing medium-chain fatty acids with an antimicrobial activity [15], a pederin analogue labrenzin [16] and the catecholate-type siderophore of labrenzbactin [17]. In addition, strain Labrenzia aggregate LZB033 could produce dimethyl sulfide from dimethylsulfoniopropionate (DMSP) and thus is used as a model DMSP-producing bacterium [18], suggesting that Roseibium bacteria may play a crucial role in the biogeochemical cycle of sulphur.…”

Identification and genomic analysis of a novel temperate bacteriophage infecting Labrenzia aggregata isolated from the Mariana Trench

“…Labrenzia aggregata, a member of order Hyphomicrobiales, class Alphaproteobacteria, is widespread in marine environments and actively contributes to nitrogen and sulfur cycles, playing roles in denitrification, dissimilatory nitrate reduction to ammonium (DNRA) (King, 2003;King and Weber, 2007), thiosulfate oxidation, as well as the biosynthesis and degradation of dimethylsulfoniopropionate (DMSP) (Curson et al, 2017). Recent studies revealed their presence in deep-sea environments, such as the Mariana Trench, due to their ability to survive and grow under high hydrostatic pressure conditions (Priyanka et al, 2014;Zhong et al, 2021). In addition, extensive horizontal gene transfer (HGT) events have been identified in L. aggregata genome, likely mediated by viruses (Zhong et al, 2021).…”