- EMDB-46553: Atomic model of Ketoacyl Reductase domain and 4 helical bundle of... -
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基本情報
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データベース: EMDB / ID: EMD-46553
タイトル
Atomic model of Ketoacyl Reductase domain and 4 helical bundle of Candida albicans Fatty Acid Synthase (FAS) in complex with Palmitoyl-CoA (in vivo binding)
マップデータ
sharpened map
試料
複合体: Fatty acid synthase
タンパク質・ペプチド: Fatty acid synthase subunit beta
タンパク質・ペプチド: Fatty acid synthase subunit alpha
リガンド: FLAVIN MONONUCLEOTIDE
リガンド: water
キーワード
Palmitoyl-CoA / FAS / allosteric inhibition / BIOSYNTHETIC PROTEIN
Natural Sciences and Engineering Research Council (NSERC, Canada)
RGPIN-2018-06070
カナダ
引用
ジャーナル: Structure / 年: 2025 タイトル: Allosteric regulation of fungal fatty acid synthesis. 著者: S M Naimul Hasan / Elnaz Khalili Samani / Alexander F A Keszei / Mahtab Heydari / Mohammad T Mazhab-Jafari / 要旨: Mycobiota fatty acid synthases (FASs) catalyze iterative cycles of condensation, dehydration, and reduction to produce saturated fatty acids. Although these multienzymes are attractive antifungal ...Mycobiota fatty acid synthases (FASs) catalyze iterative cycles of condensation, dehydration, and reduction to produce saturated fatty acids. Although these multienzymes are attractive antifungal drug targets, no clinically approved small-molecule inhibitors exist, and the regulation of de novo fatty acid synthesis remains poorly understood. Here, we identify an allosteric regulation of the FAS ketoacyl reduction reaction by palmitoyl-CoA. The palmitate moiety binds a distal site on the central wheel of fungal FAS from Saccharomyces cerevisiae and Candida albicans. This site also accommodates shorter acyl chains, but only palmitoyl-CoA suppresses ketoacyl reductase (KR) activity. While no major conformational changes occur in the reductase domain, palmitoyl-CoA binding quenches dynamics in the central disk, improving local resolution and stabilizing structured water molecules. This entropic effect underlies allosteric communication to the reductase site. Our findings uncover a regulatory mechanism of fungal FAS exploitable for antifungal drug design.
Chain - Source name: PDB / Chain - Initial model type: experimental model
精密化
空間: REAL / プロトコル: FLEXIBLE FIT
得られたモデル
PDB-9d48: Atomic model of Ketoacyl Reductase domain and 4 helical bundle of Candida albicans Fatty Acid Synthase (FAS) in complex with Palmitoyl-CoA (in vivo binding)