Structure and function of an ADP-ribose-dependent transcriptional regulator of NAD metabolism.
Structure and function of an ADP-ribose-dependent transcriptional regulator of NAD metabolism.
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DOI:
10.1016/j.str.2009.05.012
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发表时间:
2009-07-15
期刊:
影响因子:
--
通讯作者:
Zhang H
中科院分区:
文献类型:
--
作者:
Huang N;De Ingeniis J;Galeazzi L;Mancini C;Korostelev YD;Rakhmaninova AB;Gelfand MS;Rodionov DA;Raffaelli N;Zhang H
Besides its function as an essential redox cofactor, NAD also serves as consumable substrate for several reactions with broad impact on many cellular processes. NAD homeostasis appears to be tightly controlled, but the mechanism of its regulation is little understood. Here we demonstrate that a previously predicted bacterial transcriptional regulator, NrtR, represses the transcription of NAD biosynthetic genes in vitro. The NAD metabolite ADP-ribose functions as an activator suppressing NrtR repressor activity. The presence of high ADP-ribose levels in the cell is indicative of active NAD turnover in bacteria, which could signal the activation of NAD biosynthetic gene expression via inhibiting the repressor function of NrtR. By comparing the crystal structures of NrtR in complex with DNA and with ADP-ribose, we identified a “Nudix switch” element that likely plays a critical role in the allosteric regulation of DNA binding and repressor function of NrtR.
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DOI:
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