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Open data
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Basic information
Entry | Database: PDB / ID: 8t7u | ||||||
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Title | ADP-bound Bcs1 (unsymmetrized) | ||||||
![]() | Mitochondrial chaperone BCS1 | ||||||
![]() | TRANSLOCASE / Heptamer / ADP-bound / AAA-ATPase | ||||||
Function / homology | ![]() mitochondrial protein-transporting ATPase activity / protein insertion into mitochondrial inner membrane from matrix / mitochondrial cytochrome c oxidase assembly / mitochondrial respiratory chain complex III assembly / mitochondrial respiratory chain complex I assembly / mitochondrial inner membrane / ATP hydrolysis activity / mitochondrion / ATP binding Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.74 Å | ||||||
![]() | Zhan, J. / Xia, D. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Conformations of Bcs1L undergoing ATP hydrolysis suggest a concerted translocation mechanism for folded iron-sulfur protein substrate. Authors: Jingyu Zhan / Allison Zeher / Rick Huang / Wai Kwan Tang / Lisa M Jenkins / Di Xia / ![]() Abstract: 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. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 585.5 KB | Display | ![]() |
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PDB format | ![]() | 408.3 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.9 MB | Display | ![]() |
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Full document | ![]() | 1.9 MB | Display | |
Data in XML | ![]() | 89.1 KB | Display | |
Data in CIF | ![]() | 127.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 41095MC ![]() 8t14C ![]() 8t5uC ![]() 8tbyC ![]() 8ti0C ![]() 8tp1C ![]() 8tplC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
#1: Protein | Mass: 48289.887 Da / Num. of mol.: 7 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Chemical | ChemComp-ADP / Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Heptameric Bcs1 in uniform ADP-bound state captured in active ATPase cycle in the presence of substrate ISP-ED, unsymmetrized Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.340 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid type: UltrAuFoil |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 700 nm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 54.4 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 |
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Processing
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CTF correction | Type: NONE | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.74 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 37681 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Cross valid method: NONE | ||||||||||||||||||||||||
Refine LS restraints |
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