Abstract
The focus of this work is to summarize the current knowledge related to transport of nucleotides and nucleosides in and outside of cells, including the vacuole, and functions and metabolism of extracellular ATP (eATP). Thereby mechanisms on how nucleotides and their derivatives can leave cells and how their export is stimulated are described. Furthermore, effects exerted by eATP are listed including the corresponding downstream signaling events. The signal molecule eATP is removed from the extracellular space by the hydrolytic activity of several degrading enzymes like E-NTPDases, phosphatases, 5′ nucleotidases, and nucleoside hydrolases. The final reaction products of these enzymes, nucleosides and nucleobases, are then reimported into the cells to supply the corresponding cytosolic pools. The family of equilibrative nucleoside transporters (ENTs), responsible for nucleoside reimport into the cells, is presented in more detail. Finally, plant ENT family members residing at the plasma membrane or the tonoplast are compared with human and yeast homologs at the biochemical and physiological level.
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Acknowledgement
Scientific network meetings in 2010–2012 funded by a grant (STE 1455/4-1 to T.M. and I.S.) from the German Research Foundation (DFG) contributed to the content of this article. Work in E.N.’s laboratory is funded by the Deutsche Forschungsgemeinschaft (Reinhard-Kosselleck-Grant).
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Gene and Protein Identifiers
Gene and Protein Identifiers
AtAPY1 (At3g04080), AtAPY2 (At5g18280), AtPGP1 (At2g36910), AtGPA1 (At2g26300), AtrbohD (AF055357), GDA1 (856669), GhAPY1 (GU385147), GhAPY2 (GU385148), human E-NTPDase 1 (NC_000010.10), human E-NTPDase 2, human E-NTPDase 3, human E-NTPDase 8, LOX2 (L23968), OtP2X (Ot07g02160), PAL1 (NM129260), PM-ANT1 (At5g56450), PvPAP3 (D2D4J4 UniProtKB), StAPY3 (EU125183), VsNTPase1 (Q5NT85 UniProtKB), hENT1 (AAC51103), hENT2 (AAC39526), hENT3 (AF326987), AtENT1 (At1g70330), AtENT3 (At4g05120), AtENT6 (At4g05110), OsENT2 (Os07g37100), FUN26 (AAC04935).
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Möhlmann, T., Steinebrunner, I., Neuhaus, E. (2014). Nucleotides and Nucleosides: Transport, Metabolism, and Signaling Function of Extracellular ATP. In: Lüttge, U., Beyschlag, W., Cushman, J. (eds) Progress in Botany. Progress in Botany, vol 75. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-38797-5_4
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