ジャーナル: Sci Adv / 年: 2024 タイトル: Dimerization of a 5-kDa domain defines the architecture of the 5-MDa gammaproteobacterial pyruvate dehydrogenase complex. 著者: Sarah Meinhold / Rafal Zdanowicz / Christoph Giese / Rudi Glockshuber / 要旨: The pyruvate dehydrogenase complex (PDHc) is a ~5 MDa assembly of the catalytic subunits pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2), and dihydrolipoamide dehydrogenase (E3). ...The pyruvate dehydrogenase complex (PDHc) is a ~5 MDa assembly of the catalytic subunits pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2), and dihydrolipoamide dehydrogenase (E3). The PDHc core is a cubic complex of eight E2 homotrimers. Homodimers of the peripheral subunits E1 and E3 associate with the core by binding to the peripheral subunit binding domain (PSBD) of E2. Previous reports indicated that 12 E1 dimers and 6 E3 dimers bind to the 24-meric E2 core. Using an assembly arrested E2 homotrimer (E2), we show that two of the three PSBDs in the E2 dimerize, that each PSBD dimer cooperatively binds two E1 dimers, and that E3 dimers only bind to the unpaired PSBD in E2. This mechanism is preserved in wild-type PDHc, with an E1 dimer:E2 monomer:E3 dimer stoichiometry of 16:24:8. The conserved PSBD dimer interface indicates that PSBD dimerization is the previously unrecognized architectural determinant of gammaproteobacterial PDHc megacomplexes.
全体 : E. coli pyruvate dehydrogenase (E1) in complex with trimeric dihy...
全体
名称: E. coli pyruvate dehydrogenase (E1) in complex with trimeric dihydrolipoamide acetyltransferase (E2) of the pyruvate dehydrogenase complex
要素
複合体: E. coli pyruvate dehydrogenase (E1) in complex with trimeric dihydrolipoamide acetyltransferase (E2) of the pyruvate dehydrogenase complex
タンパク質・ペプチド: Pyruvate dehydrogenase E1 component
タンパク質・ペプチド: Dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex
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超分子 #1: E. coli pyruvate dehydrogenase (E1) in complex with trimeric dihy...
超分子
名称: E. coli pyruvate dehydrogenase (E1) in complex with trimeric dihydrolipoamide acetyltransferase (E2) of the pyruvate dehydrogenase complex タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Wild-type E2 protein was N- and C-terminally truncated to generate trimeric E2 complexes without lipoyl domains