8XKU image
Entry Detail
PDB ID:
8XKU
EMDB ID:
Title:
Cryo-EM structure of the Ycf2-FtsHi motor complex from Arabidopsis in ATP-bound state
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-12-24
Release Date:
2024-09-11
Method Details:
Experimental Method:
Resolution:
3.20 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Probable inactive ATP-dependent zinc metalloprotease FTSHI 4, chloroplastic
Chain IDs:A
Chain Length:855
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:ATP-dependent zinc metalloprotease FTSH 12, chloroplastic
Chain IDs:B
Chain Length:1008
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Probable inactive ATP-dependent zinc metalloprotease FTSHI 5, chloroplastic
Chain IDs:C
Chain Length:1320
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Protein Ycf2
Chain IDs:D
Chain Length:2294
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Probable inactive ATP-dependent zinc metalloprotease FTSHI 1, chloroplastic
Chain IDs:E
Chain Length:946
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Probable inactive ATP-dependent zinc metalloprotease FTSHI 2, chloroplastic
Chain IDs:F
Chain Length:876
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:AtTam46
Chain IDs:G
Chain Length:396
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:At4g28210
Chain IDs:H
Chain Length:348
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Malate dehydrogenase, chloroplastic
Chain IDs:I, J
Chain Length:403
Number of Molecules:2
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Aspartyl/glutamyl-tRNA (Asn/Gln) amidotransferase subunit B
Chain IDs:K
Chain Length:80
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:UNK
Chain IDs:L
Chain Length:18
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:UNK
Chain IDs:M
Chain Length:11
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:UNK
Chain IDs:N
Chain Length:37
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:UNK
Chain IDs:O
Chain Length:17
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:UNK
Chain IDs:P
Chain Length:19
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Description:Embryo defective 2737
Chain IDs:Q (auth: R)
Chain Length:328
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Primary Citation
Structural insights into the chloroplast protein import in land plants.
Cell 187 5651 ? (2024)
PMID: 39197452 DOI: 10.1016/j.cell.2024.08.003

Abstact

Chloroplast proteins are imported via the translocon at the outer chloroplast membrane (TOC)-translocon at the inner chloroplast membrane (TIC) supercomplex, driven by an ATPase motor. The Ycf2-FtsHi complex has been identified as the chloroplast import motor. However, its assembly and cooperation with the TIC complex during preprotein translocation remain unclear. Here, we present the structures of the Ycf2-FtsHi and TIC complexes from Arabidopsis and an ultracomplex formed between them from Pisum. The Ycf2-FtsHi structure reveals a heterohexameric AAA+ ATPase motor module with characteristic features. Four previously uncharacterized components of Ycf2-FtsHi were identified, which aid in complex assembly and anchoring of the motor module at a tilted angle relative to the membrane. When considering the structures of the TIC complex and the TIC-Ycf2-FtsHi ultracomplex together, it becomes evident that the tilted motor module of Ycf2-FtsHi enables its close contact with the TIC complex, thereby facilitating efficient preprotein translocation. Our study provides valuable structural insights into the chloroplast protein import process in land plants.

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