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• W3028832814 abstract "Abstract Fluctuations in osmolarity are one of the most prevalent stresses to which bacteria must adapt, both hypo- and hyper-osmotic conditions. Most bacteria cope with high osmolarity by accumulating compatible solutes (osmolytes) in the cytoplasm to maintain the turgor pressure of the cell. Vibrio parahaemolyticus , a halophile, utilizes at least six compatible solute transporters for the uptake of osmolytes: two ABC family ProU transporters and four betaine-carnitine-choline transporter (BCCT) family transporters. The full range of compatible solutes transported by this species has yet to be determined. Using an osmolyte phenotypic microarray plate for growth analyses, we expanded known osmolytes used by V. parahaemolyticus to include N-N dimethylglycine (DMG) amongst others. We showed that V. parahaemolyticus requires a BCCT transporter for DMG uptake, carriers that were not known to transport DMG. Growth pattern analysis of four triple- bccT mutants, possessing only one functional BCCT, indicated that BccT1 (VP1456), BccT2 (VP1723), and BccT3 (VP1905) transported DMG, which was confirmed by functional complementation in E. coli strain MKH13. BccT1 was unusual in that it could uptake both compounds with methylated head groups (glycine betaine (GB), choline and DMG) and cyclic compounds (ectoine and proline). Bioinformatics analysis identified the four coordinating residues for glycine betaine in BccT1. In silico modelling analysis demonstrated that glycine betaine, DMG, and ectoine docked in the same binding pocket in BccT1. Using site-directed mutagenesis, we showed that a strain with all four resides mutated resulted in loss of uptake of glycine betaine, DMG and ectoine. We showed three of the four residues were essential for ectoine uptake whereas only one of the residues was essential for glycine betaine uptake. Overall, we have demonstrated that DMG is a highly effective compatible solute for Vibrio species and have elucidated the amino acid residues in BccT1 that are important for coordination of glycine betaine, DMG and ectoine transport. Importance Vibrio parahaemolyticus possesses at least six osmolyte transporters, which allow the bacterium to adapt to high salinity conditions. In this study, we identified several novel osmolytes that are utilized by V. parahaemolyticus . We demonstrated that the compound dimethylglycine (DMG), which is abundant in the marine environment, is a highly effective osmolyte for Vibrio species. We determined that DMG is transported via BCCT-family carriers, which have not been shown previously to uptake this compound. BccT1 was a carrier for glycine betaine, DMG and ectoine and we identified the amino acid residues essential for coordination of these compounds. The data suggest that for BccT1, glycine betaine is more easily accommodated than ectoine in the transporter binding pocket." @default.
• W3028832814 created "2020-06-05" @default.
• W3028832814 creator A5011210641 @default.
• W3028832814 creator A5031932639 @default.
• W3028832814 creator A5038048320 @default.
• W3028832814 creator A5076704124 @default.
• W3028832814 date "2020-05-31" @default.
• W3028832814 modified "2023-09-24" @default.
• W3028832814 title "Investigations of dimethylglycine (DMG), glycine betaine and ectoine uptake by a BCCT family transporter with broad substrate specificity in Vibrio species" @default.
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• W3028832814 doi "https://doi.org/10.1101/2020.05.29.123752" @default.
• W3028832814 hasPublicationYear "2020" @default.
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• W3028832814 hasAuthorship W3028832814A5011210641 @default.
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• W3028832814 hasAuthorship W3028832814A5038048320 @default.
• W3028832814 hasAuthorship W3028832814A5076704124 @default.

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