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-Structure paper
| タイトル | Cryo-EM Structure of Recombinantly Expressed hUGDH Unveils a Hidden, Alternative Allosteric Inhibitor. |
|---|---|
| ジャーナル・号・ページ | Biochemistry, Vol. 64, Issue 1, Page 92-9104, Year 2025 |
| 掲載日 | 2025年1月7日 |
著者 | John H O'Brien / Renuka Kadirvelraj / Po-Sen Tseng / Nolan Ross-Kemppinen / David Crich / Richard M Walsh / Zachary A Wood / ![]() |
| PubMed 要旨 | Human UDP-glucose dehydrogenase (hUGDH) catalyzes the oxidation of UDP-glucose into UDP-glucuronic acid, an essential substrate in the Phase II metabolism of drugs. hUGDH is a hexamer that exists in ...Human UDP-glucose dehydrogenase (hUGDH) catalyzes the oxidation of UDP-glucose into UDP-glucuronic acid, an essential substrate in the Phase II metabolism of drugs. hUGDH is a hexamer that exists in an equilibrium between an active (E) state and an inactive (E) state, with the latter being stabilized by the binding of the allosteric inhibitor UDP-xylose (UDP-Xyl). The allosteric transition between E and E is slow and can be observed as a lag in progress curves. Previous analysis of the lag suggested that unliganded hUGDH exists mainly as E, but two unique crystal forms suggest that the enzyme favors the E state. Resolving this discrepancy is necessary to fully understand the allosteric mechanism of hUGDH. Here, we used cryo-EM to show that recombinant hUGDH expressed in copurifies with UDP-4-keto-xylose (UX4O), which mimics the UDP-Xyl inhibitor and favors the E state. Cryo-EM studies show that removing UX4O from hUGDH shifts the ensemble to favor the E state. This shift is consistent with progress curve analysis, which shows the absence of a lag for unliganded hUGDH. Inhibition studies show that hUGDH has similar affinities for UDP-Xyl and UX4O. The discovery that UX4O inhibits allosteric hUGDH suggests that UX4O may be the physiologically relevant inhibitor of allosteric UGDHs in bacteria that do not make UDP-Xyl. |
リンク | Biochemistry / PubMed:39680853 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.06 - 2.38 Å |
| 構造データ | EMDB-46853, PDB-9dgz: EMDB-46854, PDB-9dh0: |
| 化合物 | ![]() ChemComp-HOH: ![]() PDB-1bcu: |
| 由来 |
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キーワード | OXIDOREDUCTASE / Unliganded human UDP-Glucose Dehydrogenase / OXIDOREDUCTASE/INHIBITOR / Human UDP-Glucose Dehydrogenase / UDP-4-keto-xylose / OXIDOREDUCTASE-INHIBITOR complex |
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