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- W2006458211 abstract "Enzymatic utilization of nicotinamide adenine dinucleotide (NAD) has increasingly been shown to have fundamental roles in gene regulation, signal transduction, and protein modification. Many of the processes require the cleavage of the nicotinamide moiety from the substrate and the formation of a reactive intermediate. Using X-ray crystallography, we show that human CD38, an NAD-utilizing enzyme, is capable of catalyzing the cleavage reactions through both covalent and noncovalent intermediates, depending on the substrate used. The covalent intermediate is resistant to further attack by nucleophiles, resulting in mechanism-based enzyme inactivation. The noncovalent intermediate is stabilized mainly through H-bond interactions, but appears to remain reactive. Our structural results favor the proposal of a noncovalent intermediate during normal enzymatic utilization of NAD by human CD38 and provide structural insights into the design of covalent and noncovalent inhibitors targeting NAD-utilization pathways." @default.
- W2006458211 created "2016-06-24" @default.
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- W2006458211 date "2008-10-01" @default.
- W2006458211 modified "2023-10-15" @default.
- W2006458211 title "Covalent and Noncovalent Intermediates of an NAD Utilizing Enzyme, Human CD38" @default.
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- W2006458211 doi "https://doi.org/10.1016/j.chembiol.2008.08.007" @default.
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