sphinganine biosynthetic process / regulation of fat cell apoptotic process / negative regulation of ceramide biosynthetic process / sphingomyelin biosynthetic process / serine palmitoyltransferase complex / intracellular sphingolipid homeostasis / serine C-palmitoyltransferase activity / serine C-palmitoyltransferase / ceramide metabolic process / sphingosine biosynthetic process ...sphinganine biosynthetic process / regulation of fat cell apoptotic process / negative regulation of ceramide biosynthetic process / sphingomyelin biosynthetic process / serine palmitoyltransferase complex / intracellular sphingolipid homeostasis / serine C-palmitoyltransferase activity / serine C-palmitoyltransferase / ceramide metabolic process / sphingosine biosynthetic process / sphingolipid metabolic process / sphingolipid biosynthetic process / regulation of smooth muscle contraction / Sphingolipid de novo biosynthesis / ceramide biosynthetic process / positive regulation of lipophagy / motor behavior / negative regulation of B cell apoptotic process / adipose tissue development / specific granule membrane / positive regulation of autophagy / myelination / secretory granule membrane / positive regulation of protein localization to nucleus / pyridoxal phosphate binding / intracellular protein localization / Neutrophil degranulation / endoplasmic reticulum membrane / endoplasmic reticulum / plasma membrane 類似検索 - 分子機能
: / Small subunit of serine palmitoyltransferase-like / Small subunit of serine palmitoyltransferase-like / ORMDL family / ORMDL family / : / Aminotransferase, class-II, pyridoxal-phosphate binding site / Aminotransferases class-II pyridoxal-phosphate attachment site. / Aminotransferase, class I/classII / Aminotransferase class I and II ...: / Small subunit of serine palmitoyltransferase-like / Small subunit of serine palmitoyltransferase-like / ORMDL family / ORMDL family / : / Aminotransferase, class-II, pyridoxal-phosphate binding site / Aminotransferases class-II pyridoxal-phosphate attachment site. / Aminotransferase, class I/classII / Aminotransferase class I and II / Aspartate Aminotransferase; domain 2 / Type I PLP-dependent aspartate aminotransferase-like (Major domain) / Pyridoxal phosphate-dependent transferase, small domain / Pyridoxal phosphate-dependent transferase, major domain / Pyridoxal phosphate-dependent transferase / 3-Layer(aba) Sandwich / Alpha Beta 類似検索 - ドメイン・相同性
PYRIDOXAL-5'-PHOSPHATE / Serine palmitoyltransferase 1 / Serine palmitoyltransferase 2 / ORM1-like protein 3 / Serine palmitoyltransferase small subunit A 類似検索 - 構成要素
ジャーナル: Nat Commun / 年: 2023 タイトル: Ceramide sensing by human SPT-ORMDL complex for establishing sphingolipid homeostasis. 著者: Tian Xie / Peng Liu / Xinyue Wu / Feitong Dong / Zike Zhang / Jian Yue / Usha Mahawar / Faheem Farooq / Hisham Vohra / Qi Fang / Wenchen Liu / Binks W Wattenberg / Xin Gong / 要旨: The ORM/ORMDL family proteins function as regulatory subunits of the serine palmitoyltransferase (SPT) complex, which is the initiating and rate-limiting enzyme in sphingolipid biosynthesis. This ...The ORM/ORMDL family proteins function as regulatory subunits of the serine palmitoyltransferase (SPT) complex, which is the initiating and rate-limiting enzyme in sphingolipid biosynthesis. This complex is tightly regulated by cellular sphingolipid levels, but the sphingolipid sensing mechanism is unknown. Here we show that purified human SPT-ORMDL complexes are inhibited by the central sphingolipid metabolite ceramide. We have solved the cryo-EM structure of the SPT-ORMDL3 complex in a ceramide-bound state. Structure-guided mutational analyses reveal the essential function of this ceramide binding site for the suppression of SPT activity. Structural studies indicate that ceramide can induce and lock the N-terminus of ORMDL3 into an inhibitory conformation. Furthermore, we demonstrate that childhood amyotrophic lateral sclerosis (ALS) variants in the SPTLC1 subunit cause impaired ceramide sensing in the SPT-ORMDL3 mutants. Our work elucidates the molecular basis of ceramide sensing by the SPT-ORMDL complex for establishing sphingolipid homeostasis and indicates an important role of impaired ceramide sensing in disease development.
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2022年7月19日
登録サイト: PDBJ / 処理サイト: PDBJ
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2023年7月5日
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2023年7月5日
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2023年7月5日
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2023年7月5日
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2023年7月5日
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2024年3月20日
Group: Data collection / Source and taxonomy カテゴリ: chem_comp_atom / chem_comp_bond / entity_src_gen
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