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-Structure paper
タイトル | Using Cryo-EM to Map Small Ligands on Dynamic Metabolic Enzymes: Studies with Glutamate Dehydrogenase. |
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ジャーナル・号・ページ | Mol Pharmacol, Vol. 89, Issue 6, Page 645-651, Year 2016 |
掲載日 | 2016年4月1日 |
著者 | Mario J Borgnia / Soojay Banerjee / Alan Merk / Doreen Matthies / Alberto Bartesaghi / Prashant Rao / Jason Pierson / Lesley A Earl / Veronica Falconieri / Sriram Subramaniam / Jacqueline L S Milne / |
PubMed 要旨 | Cryo-electron microscopy (cryo-EM) methods are now being used to determine structures at near-atomic resolution and have great promise in molecular pharmacology, especially in the context of mapping ...Cryo-electron microscopy (cryo-EM) methods are now being used to determine structures at near-atomic resolution and have great promise in molecular pharmacology, especially in the context of mapping the binding of small-molecule ligands to protein complexes that display conformational flexibility. We illustrate this here using glutamate dehydrogenase (GDH), a 336-kDa metabolic enzyme that catalyzes the oxidative deamination of glutamate. Dysregulation of GDH leads to a variety of metabolic and neurologic disorders. Here, we report near-atomic resolution cryo-EM structures, at resolutions ranging from 3.2 Å to 3.6 Å for GDH complexes, including complexes for which crystal structures are not available. We show that the binding of the coenzyme NADH alone or in concert with GTP results in a binary mixture in which the enzyme is in either an "open" or "closed" state. Whereas the structure of NADH in the active site is similar between the open and closed states, it is unexpectedly different at the regulatory site. Our studies thus demonstrate that even in instances when there is considerable structural information available from X-ray crystallography, cryo-EM methods can provide useful complementary insights into regulatory mechanisms for dynamic protein complexes. |
リンク | Mol Pharmacol / PubMed:27036132 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.26 - 3.6 Å |
構造データ | EMDB-6630: Glutamate dehydrogenase in the unliganded state EMDB-6632, PDB-3jd3: EMDB-6633, PDB-3jd4: |
化合物 | ChemComp-GTP: ChemComp-NAI: |
由来 |
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キーワード | OXIDOREDUCTASE / glutamate metabolism / mitochondria |