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- W2130266952 abstract "Inosine-5'-monophosphate dehydrogenase (IMPDH) is a rate-limiting enzyme in nucleotide biosynthesis studied as an important therapeutic target and its complex functioning in vivo is still puzzling and debated. Here, we highlight the structural basis for the regulation of IMPDHs by MgATP. Our results demonstrate the essential role of the CBS tandem, conserved among almost all IMPDHs. We found that Pseudomonas aeruginosa IMPDH is an octameric enzyme allosterically regulated by MgATP and showed that this octameric organization is widely conserved in the crystal structures of other IMPDHs. We also demonstrated that human IMPDH1 adopts two types of complementary octamers that can pile up into isolated fibers in the presence of MgATP. The aggregation of such fibers in the autosomal dominant mutant, D226N, could explain the onset of the retinopathy adRP10. Thus, the regulatory CBS modules in IMPDHs are functional and they can either modulate catalysis or macromolecular assembly." @default.
- W2130266952 created "2016-06-24" @default.
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- W2130266952 date "2013-06-01" @default.
- W2130266952 modified "2023-10-10" @default.
- W2130266952 title "MgATP Regulates Allostery and Fiber Formation in IMPDHs" @default.
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- W2130266952 doi "https://doi.org/10.1016/j.str.2013.03.011" @default.
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