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- W2755428514 abstract "The ecto-nucleotide pyrophosphatase/phosphodiesterase (NPP) family of proteins mediates purinergic signaling by degrading extracellular nucleotides and also participates in phospholipid metabolism. NPP5 (ENPP5) is the least characterized member of this group and its specific role is unknown. This enzyme does not display activity on certain nucleotides and on other typical NPP substrates. In order to gain insights into its function, we determined the crystal structure of human and murine NPP5. Structural comparison with close homologs revealed a key phenylalanine to tyrosine substitution that prevents efficient hydrolysis of nucleotide diphosphates and triphosphates; reversal of this mutation enabled degradation of these molecules. Interestingly, NPP5 is able to cleave nicotinamide adenine dinucleotide (NAD), suggesting a potential role of this enzyme in NAD-based neurotransmission. An NPP5-specific metal binding motif is found adjacent to the active site, although its significance is unclear. These findings expand our understanding of substrate specificity within the NPP family. Database Structural data are available in the Protein Data Bank under the accession numbers 5VEM, 5VEN, and 5VEO." @default.
- W2755428514 created "2017-09-25" @default.
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- W2755428514 date "2017-09-30" @default.
- W2755428514 modified "2023-10-16" @default.
- W2755428514 title "A key tyrosine substitution restricts nucleotide hydrolysis by the ectoenzyme <scp>NPP</scp> 5" @default.
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- W2755428514 doi "https://doi.org/10.1111/febs.14266" @default.
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