- EMDB-18770: Structure of human ceramide synthase 6 (CerS6) bound to C16:0 -
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基本情報
登録情報
データベース: EMDB / ID: EMD-18770
タイトル
Structure of human ceramide synthase 6 (CerS6) bound to C16:0
マップデータ
Final cryoSPARC sharpened map after NU refinement used for model refinement
試料
複合体: CerS6-Nb22 complex
タンパク質・ペプチド: Isoform 2 of Ceramide synthase 6
タンパク質・ペプチド: Nanobody-22
リガンド: PALMITIC ACID
リガンド: 1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
リガンド: 2-acetamido-2-deoxy-beta-D-glucopyranose
キーワード
CERAMIDE / SPHINGOLIPID / COVALENT INTERMEDIATE / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
positive regulation of oligodendrocyte apoptotic process / sphingoid base N-palmitoyltransferase / sphingosine N-acyltransferase activity / sphingolipid biosynthetic process / Sphingolipid de novo biosynthesis / ceramide biosynthetic process / oligodendrocyte development / inflammatory response / endoplasmic reticulum membrane / DNA binding / membrane 類似検索 - 分子機能
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Structural basis of the mechanism and inhibition of a human ceramide synthase. 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 ...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 / 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.