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- W1640068223 abstract "Several important signaling pathways require NAD as substrate, thereby leading to significant consumption of the molecule. Because NAD is also an essential redox carrier, its continuous resynthesis is vital. In higher eukaryotes, maintenance of compartmentalized NAD pools is critical, but so far rather little is known about the regulation and subcellular distribution of NAD biosynthetic enzymes. The key step in NAD biosynthesis is the formation of the dinucleotide by nicotinamide/nicotinic acid mononucleotide adenylyltransferases (NMNATs). The three human isoforms were localized to the nucleus, the Golgi complex, and mitochondria. Here, we show that their genes contain unique exons that encode isoform-specific domains to mediate subcellular targeting and post-translational modifications. These domains are dispensable for catalytic activity, consistent with their absence from NMNATs of lower organisms. We further demonstrate that the Golgi-associated NMNAT is palmitoylated at two adjacent cysteine residues of its isoform-specific domain and thereby anchored at the cytoplasmic surface, a potential mechanism to regulate the cytosolic NAD pool. Insertion of unique domains thus provides a yet unrecognized enzyme targeting mode, which has also been adapted to modulate subcellular NAD supply." @default.
- W1640068223 created "2016-06-24" @default.
- W1640068223 creator A5036605757 @default.
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- W1640068223 date "2010-06-01" @default.
- W1640068223 modified "2023-10-12" @default.
- W1640068223 title "Isoform-specific Targeting and Interaction Domains in Human Nicotinamide Mononucleotide Adenylyltransferases" @default.
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- W1640068223 doi "https://doi.org/10.1074/jbc.m110.107631" @default.
- W1640068223 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2881809" @default.
- W1640068223 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20388704" @default.
- W1640068223 hasPublicationYear "2010" @default.
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