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Last Updated: 2019-02-07
2-O-α-Mannosyl-D-glycerate (MG; also named as Alpha-Mannosylglycerate) is an organic compound that will affect the osmosis in hyperthermophilic archaea and bacteria. In E.coli, 2-O-α-mannosyl-D-glycerate PTS permease (mngA) import MG into cell, and then phosphorylate MG to 2-O-(6-phospho-α-mannosyl)-D-glycerate by phosphocarrier protein HPr. 2-O-(6-phospho-α-mannosyl)-D-glycerate is converted to glyceric acid as well as mannose 6-phosphate by alpha-mannosidase mngB. Finally, glyceric acid is catalyzed to 2-Phospho-D-glyceric acid with ATP as energy source by Glycerate kinase 2. E.coli can't use MG as osmotic stress protection, but it can use MG as a carbon source.
2-O-alpha-Mannosyl-D-glycerate Degradation References
Sampaio MM, Chevance F, Dippel R, Eppler T, Schlegel A, Boos W, Lu YJ, Rock CO: Phosphotransferase-mediated transport of the osmolyte 2-O-alpha-mannosyl-D-glycerate in Escherichia coli occurs by the product of the mngA (hrsA) gene and is regulated by the mngR (farR) gene product acting as repressor. J Biol Chem. 2004 Feb 13;279(7):5537-48. doi: 10.1074/jbc.M310980200. Epub 2003 Nov 25.Pubmed: 14645248
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