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-Structure paper
| タイトル | Structural basis of the mechanism and inhibition of a human ceramide synthase. |
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| ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 32, Issue 3, Page 431-440, Year 2025 |
| 掲載日 | 2024年11月11日 |
著者 | Tomas C Pascoa / Ashley C W Pike / Christofer S Tautermann / Gamma Chi / Michael Traub / Andrew Quigley / Rod Chalk / Saša Štefanić / Sven Thamm / Alexander Pautsch / Elisabeth P Carpenter / Gisela Schnapp / David B Sauer / ![]() |
| PubMed 要旨 | Ceramides are bioactive sphingolipids crucial for regulating cellular metabolism. Ceramides and dihydroceramides are synthesized by six ceramide synthase (CerS) enzymes, each with specificity for ...Ceramides are bioactive sphingolipids crucial for regulating cellular metabolism. Ceramides and dihydroceramides are synthesized by six ceramide synthase (CerS) enzymes, each with specificity for different acyl-CoA substrates. Ceramide with a 16-carbon acyl chain (C16 ceramide) has been implicated in obesity, insulin resistance and liver disease and the C16 ceramide-synthesizing CerS6 is regarded as an attractive drug target for obesity-associated disease. Despite their importance, the molecular mechanism underlying ceramide synthesis by CerS enzymes remains poorly understood. Here we report cryo-electron microscopy structures of human CerS6, capturing covalent intermediate and product-bound states. These structures, along with biochemical characterization, reveal that CerS catalysis proceeds through a ping-pong reaction mechanism involving a covalent acyl-enzyme intermediate. Notably, the product-bound structure was obtained upon reaction with the mycotoxin fumonisin B1, yielding insights into its inhibition of CerS. These results provide a framework for understanding CerS function, selectivity and inhibition and open routes for future drug discovery. |
リンク | Nat Struct Mol Biol / PubMed:39528795 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.0 - 3.2 Å |
| 構造データ | EMDB-18770, PDB-8qz6: EMDB-18771, PDB-8qz7: EMDB-19869, PDB-9eot: |
| 化合物 | ![]() ChemComp-PLM: ![]() ChemComp-PC1: ![]() ChemComp-NAG: ![]()
ChemComp-XBX: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / CERAMIDE / SPHINGOLIPID / COVALENT INTERMEDIATE / MYCOTOXIN / FUMONISIN B1 / INHIBITORY PRODUCT |
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homo sapiens (ヒト)
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