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Phosphate Uptake and Its Relation to Arsenic Toxicity in Lactobacilli.

Authors :
Corrales D
Alcántara C
Clemente MJ
Vélez D
Devesa V
Monedero V
Zúñiga M
Source :
International journal of molecular sciences [Int J Mol Sci] 2024 May 04; Vol. 25 (9). Date of Electronic Publication: 2024 May 04.
Publication Year :
2024

Abstract

The use of probiotic lactobacilli has been proposed as a strategy to mitigate damage associated with exposure to toxic metals. Their protective effect against cationic metal ions, such as those of mercury or lead, is believed to stem from their chelating and accumulating potential. However, their retention of anionic toxic metalloids, such as inorganic arsenic, is generally low. Through the construction of mutants in phosphate transporter genes ( pst ) in Lactiplantibacillus plantarum and Lacticaseibacillus paracasei strains, coupled with arsenate [As(V)] uptake and toxicity assays, we determined that the incorporation of As(V), which structurally resembles phosphate, is likely facilitated by phosphate transporters. Surprisingly, inactivation in Lc. paracasei of PhoP, the transcriptional regulator of the two-component system PhoPR, a signal transducer involved in phosphate sensing, led to an increased resistance to arsenite [As(III)]. In comparison to the wild type, the phoP strain exhibited no differences in the ability to retain As(III), and there were no observed changes in the oxidation of As(III) to the less toxic As(V). These results reinforce the idea that specific transport, and not unspecific cell retention, plays a role in As(V) biosorption by lactobacilli, while they reveal an unexpected phenotype for the lack of the pleiotropic regulator PhoP.

Details

Language :
English
ISSN :
1422-0067
Volume :
25
Issue :
9
Database :
MEDLINE
Journal :
International journal of molecular sciences
Publication Type :
Academic Journal
Accession number :
38732236
Full Text :
https://doi.org/10.3390/ijms25095017