ジャーナル: Sci Adv / 年: 2024 タイトル: Stoichiometry and architecture of the human pyruvate dehydrogenase complex. 著者: Rafal Zdanowicz / Pavel Afanasyev / Adam Pruška / Julian A Harrison / Christoph Giese / Daniel Boehringer / Alexander Leitner / Renato Zenobi / Rudi Glockshuber / 要旨: The pyruvate dehydrogenase complex (PDHc) is a key megaenzyme linking glycolysis with the citric acid cycle. In mammalian PDHc, dihydrolipoamide acetyltransferase (E2) and the dihydrolipoamide ...The pyruvate dehydrogenase complex (PDHc) is a key megaenzyme linking glycolysis with the citric acid cycle. In mammalian PDHc, dihydrolipoamide acetyltransferase (E2) and the dihydrolipoamide dehydrogenase-binding protein (E3BP) form a 60-subunit core that associates with the peripheral subunits pyruvate dehydrogenase (E1) and dihydrolipoamide dehydrogenase (E3). The structure and stoichiometry of the fully assembled, mammalian PDHc or its core remained elusive. Here, we demonstrate that the human PDHc core is formed by 48 E2 copies that bind 48 E1 heterotetramers and 12 E3BP copies that bind 12 E3 homodimers. Cryo-electron microscopy, together with native and cross-linking mass spectrometry, confirmed a core model in which 8 E2 homotrimers and 12 E2-E2-E3BP heterotrimers assemble into a pseudoicosahedral particle such that the 12 E3BP molecules form six E3BP-E3BP intertrimer interfaces distributed tetrahedrally within the 60-subunit core. The even distribution of E3 subunits in the peripheral shell of PDHc guarantees maximum enzymatic activity of the megaenzyme.
全体 : 60-meric complex of dihydrolipoamide acetyltransferase (E2) of th...
全体
名称: 60-meric complex of dihydrolipoamide acetyltransferase (E2) of the human pyruvate dehydrogenase complex
要素
複合体: 60-meric complex of dihydrolipoamide acetyltransferase (E2) of the human pyruvate dehydrogenase complex
タンパク質・ペプチド: Dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex, mitochondrial
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超分子 #1: 60-meric complex of dihydrolipoamide acetyltransferase (E2) of th...
超分子
名称: 60-meric complex of dihydrolipoamide acetyltransferase (E2) of the human pyruvate dehydrogenase complex タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
由来(天然)
生物種: Homo sapiens (ヒト)
分子量
理論値: 3.6 MDa
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分子 #1: Dihydrolipoyllysine-residue acetyltransferase component of pyruva...