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-Structure paper
| タイトル | Conformational landscape of the mycobacterial inosine 5'-monophosphate dehydrogenase octamerization interface. |
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| ジャーナル・号・ページ | J Struct Biol, Vol. 217, Issue 2, Page 108198, Year 2025 |
| 掲載日 | 2025年3月17日 |
著者 | Ondřej Bulvas / Zdeněk Knejzlík / Anatolij Filimoněnko / Tomáš Kouba / Iva Pichová / ![]() |
| PubMed 要旨 | Inosine 5'-monophosphate dehydrogenase (IMPDH), a key enzyme in bacterial purine metabolism, plays an essential role in the biosynthesis of guanine nucleotides and shows promise as a target for ...Inosine 5'-monophosphate dehydrogenase (IMPDH), a key enzyme in bacterial purine metabolism, plays an essential role in the biosynthesis of guanine nucleotides and shows promise as a target for antimicrobial drug development. Despite its significance, the conformational dynamics and substrate-induced structural changes in bacterial IMPDH remain poorly understood, particularly with respect to its octameric assembly. Using cryo-EM, we present full-length structures of IMPDH from Mycobacterium smegmatis (MsmIMPDH) captured in a reaction intermediate state, revealing conformational changes upon substrate binding. The structures feature resolved flexible loops that coordinate the binding of the substrate, the cofactor, and the K ion. Our structural analysis identifies a novel octamerization interface unique to MsmIMPDH. Additionally, a previously unobserved barrel-like density suggests potential self-interactions within the C-terminal regions, hinting at a regulatory mechanism tied to assembly and function of the enzyme. These data provide insights into substrate-induced conformational dynamics and novel interaction interfaces in MsmIMPDH, potentially informing the development of IMPDH-targeted drugs. |
リンク | J Struct Biol / PubMed:40107326 |
| 手法 | EM (単粒子) |
| 解像度 | 2.39 - 3.01 Å |
| 構造データ | EMDB-52559, PDB-9i0k: EMDB-52560, PDB-9i0l: EMDB-52561, PDB-9i0m: |
| 化合物 | ![]() ChemComp-IMP: ![]() ChemComp-NAD: ![]() ChemComp-K: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | OXIDOREDUCTASE / Octamer / reaction intermediate / Purine metabolism / IMPDH / ligand complex |
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mycolicibacterium smegmatis mc2 155 (バクテリア)
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