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Open data
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Basic information
Entry | Database: PDB / ID: 7f02 | ||||||
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Title | Cytochrome c-type biogenesis protein CcmABCD from E. coli | ||||||
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![]() | MEMBRANE PROTEIN / ATP-binding exporter / Heme transmembrane transporter / Cytochrome c biogenesis protein. | ||||||
Function / homology | ![]() cytochrome c biosynthetic process / heme import across plasma membrane / ABC-type heme transporter / heme transmembrane transporter activity / ABC-type heme transporter activity / cytochrome complex assembly / ATP-binding cassette (ABC) transporter complex / heme binding / ATP hydrolysis activity / ATP binding / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.24 Å | ||||||
![]() | Li, J. / Zheng, W. / Gu, M. / Zhang, K. / Zhu, J.P. | ||||||
![]() | ![]() Title: Structures of the CcmABCD heme release complex at multiple states. Authors: Jiao Li / Wan Zheng / Ming Gu / Long Han / Yanmei Luo / Koukou Yu / Mengxin Sun / Yuliang Zong / Xiuxiu Ma / Bing Liu / Ethan P Lowder / Deanna L Mendez / Robert G Kranz / Kai Zhang / Jiapeng Zhu / ![]() ![]() Abstract: Cytochromes c use heme as a cofactor to carry electrons in respiration and photosynthesis. The cytochrome c maturation system I, consisting of eight membrane proteins (CcmABCDEFGH), results in the ...Cytochromes c use heme as a cofactor to carry electrons in respiration and photosynthesis. The cytochrome c maturation system I, consisting of eight membrane proteins (CcmABCDEFGH), results in the attachment of heme to cysteine residues of cytochrome c proteins. Since all c-type cytochromes are periplasmic, heme is first transported to a periplasmic heme chaperone, CcmE. A large membrane complex, CcmABCD has been proposed to carry out this transport and linkage to CcmE, yet the structural basis and mechanisms underlying the process are unknown. We describe high resolution cryo-EM structures of CcmABCD in an unbound form, in complex with inhibitor AMP-PNP, and in complex with ATP and heme. We locate the ATP-binding site in CcmA and the heme-binding site in CcmC. Based on our structures combined with functional studies, we propose a hypothetic model of heme trafficking, heme transfer to CcmE, and ATP-dependent release of holoCcmE from CcmABCD. CcmABCD represents an ABC transporter complex using the energy of ATP hydrolysis for the transfer of heme from one binding partner (CcmC) to another (CcmE). | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 201.4 KB | Display | ![]() |
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PDB format | ![]() | 160.5 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 31394MC ![]() 7f03C ![]() 7f04C ![]() 7vfjC ![]() 7vfpC 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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Components
-Protein , 1 types, 2 molecules AE
#1: Protein | Mass: 23080.213 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() |
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-Heme exporter protein ... , 3 types, 4 molecules BFCD
#2: Protein | Mass: 23632.676 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() #3: Protein | | Mass: 27911.264 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() #4: Protein | | Mass: 7753.103 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() |
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-Non-polymers , 3 types, 5 molecules ![](data/chem/img/MG.gif)
![](data/chem/img/PO4.gif)
![](data/chem/img/3PE.gif)
![](data/chem/img/PO4.gif)
![](data/chem/img/3PE.gif)
#5: Chemical | #6: Chemical | #7: Chemical | ChemComp-3PE / | |
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-Details
Has ligand of interest | Y |
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Sequence details | Proteins used in this study were derived from Escherichia coli BL21(DE3). However, since the ...Proteins used in this study were derived from Escherichia coli BL21(DE3). However, since the sequence references were not available in UNIPROT at the time of data processing, all references were derived from Escherichia coli K12. |
-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: Cytochrome c-type biogenesis protein CcmABCD / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT |
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Molecular weight | Value: 0.13 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
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 |
Image recording | Electron dose: 1.4388 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.24 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 270353 / Symmetry type: POINT |