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-Structure paper
| タイトル | Structural and molecular basis for allosteric regulation and catalytic coupling of human phosphoribosylformylglycinamidine synthase. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年2月13日 |
著者 | Nandini Sharma / Weijie Zhou / Jarrod B French / ![]() |
| PubMed 要旨 | Purine nucleotides are ubiquitous molecules essential for all life. The de novo biosynthesis of purines is a metabolic dependency that is frequently reprogrammed in cancers and is a well-established ...Purine nucleotides are ubiquitous molecules essential for all life. The de novo biosynthesis of purines is a metabolic dependency that is frequently reprogrammed in cancers and is a well-established target for chemotherapies, immune modulation and antivirals. Here, we report cryo-electron microscopy structures of the multi-domain human phosphoribosylformylglycinamidine synthase, a central purine biosynthetic enzyme and foundational feature of the purinosome metabolon. These data capture, the proposed iminophosphate intermediate and provide the structural elucidation of an ammonia channel connecting the active sites of the glutaminase and synthase domains. Analysis of this series of structures and the accompanying biochemical data also reveal the molecular features and transient conformational changes that underlie allosteric regulation and catalytic coupling of the domains. This data resolves several longstanding mechanistic questions about this enzyme class and provides a strong foundation for therapeutic development. |
リンク | Nat Commun / PubMed:41688441 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.19 - 3.31 Å |
| 構造データ | EMDB-49179, PDB-9n9w: EMDB-49198, PDB-9nal: EMDB-49207, PDB-9nb3: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-ANP: ![]() ChemComp-MG: ![]() ChemComp-HOH: ![]() PDB-1b7i: ![]() ChemComp-FGR: ![]() ChemComp-GLN: |
| 由来 |
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キーワード | LIGASE / phosphoribosylformylglycinamidine synthase / iminophosphate ADP human phosphoribosylglycinamidine synthase / quaternary complex phosphoribosylglycinamidine synthase FGAR Thioester AMPPNP |
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