National Institutes of Health/National Cancer Institute (NIH/NCI)
米国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: Conformations of Bcs1L undergoing ATP hydrolysis suggest a concerted translocation mechanism for folded iron-sulfur protein substrate. 著者: Jingyu Zhan / Allison Zeher / Rick Huang / Wai Kwan Tang / Lisa M Jenkins / Di Xia / 要旨: The human AAA-ATPase Bcs1L translocates the fully assembled Rieske iron-sulfur protein (ISP) precursor across the mitochondrial inner membrane, enabling respiratory Complex III assembly. Exactly how ...The human AAA-ATPase Bcs1L translocates the fully assembled Rieske iron-sulfur protein (ISP) precursor across the mitochondrial inner membrane, enabling respiratory Complex III assembly. Exactly how the folded substrate is bound to and released from Bcs1L has been unclear, and there has been ongoing debate as to whether subunits of Bcs1L act in sequence or in unison hydrolyzing ATP when moving the protein cargo. Here, we captured Bcs1L conformations by cryo-EM during active ATP hydrolysis in the presence or absence of ISP substrate. In contrast to the threading mechanism widely employed by AAA proteins in substrate translocation, subunits of Bcs1L alternate uniformly between ATP and ADP conformations without detectable intermediates that have different, co-existing nucleotide states, indicating that the subunits act in concert. We further show that the ISP can be trapped by Bcs1 when its subunits are all in the ADP-bound state, which we propose to be released in the apo form.
複合体: A WATER SOLUBLE FRAGMENT OF THE RIESKE IRON-SULFUR PROTEIN OF THE BOVINE HEART MITOCHONDRIAL CYTOCHROME BC1-COMPLEX
タンパク質・ペプチド: RIESKE IRON-SULFUR PROTEIN
複合体: Mitochondrial chaperone BCS1
タンパク質・ペプチド: Mitochondrial chaperone BCS1
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超分子 #1: Bcs1 bound with ISP-ED
超分子
名称: Bcs1 bound with ISP-ED / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
分子量
理論値: 340 KDa
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超分子 #2: A WATER SOLUBLE FRAGMENT OF THE RIESKE IRON-SULFUR PROTEIN OF THE...
超分子
名称: A WATER SOLUBLE FRAGMENT OF THE RIESKE IRON-SULFUR PROTEIN OF THE BOVINE HEART MITOCHONDRIAL CYTOCHROME BC1-COMPLEX タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #2