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- EMDB-60068: Local EM map of the AtYcf2-FtsHi motor complex in the inter-membr... -

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Basic information

Entry
Database: EMDB / ID: EMD-60068
TitleLocal EM map of the AtYcf2-FtsHi motor complex in the inter-membrane space region (Apo dataset)
Map datalocal map in the intermembrane space region
Sample
  • Complex: The Ycf2-FtsHi motor complex from Arabidopsis
KeywordsATP-motor / Ycf2 / FtsHi / MEMBRANE PROTEIN / MOTOR PROTEIN
Biological speciesArabidopsis thaliana (thale cress)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsLiang K / Zhan X / Wu J / Yan Z
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32271239 China
CitationJournal: Cell / Year: 2024
Title: Structural insights into the chloroplast protein import in land plants.
Authors: Ke Liang / Zeyu Jin / Xiechao Zhan / Yuxin Li / Qikui Xu / Yanqiu Xie / Yi Yang / Shaojie Wang / Jianping Wu / Zhen Yan /
Abstract: 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 ...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.
History
DepositionMay 8, 2024-
Header (metadata) releaseSep 11, 2024-
Map releaseSep 11, 2024-
UpdateNov 6, 2024-
Current statusNov 6, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_60068.png

Downloads & links

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Map

FileDownload / File: emd_60068.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationlocal map in the intermembrane space region
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.09 Å/pix.
x 360 pix.
= 391.32 Å		1.09 Å/pix.
x 360 pix.
= 391.32 Å		1.09 Å/pix.
x 360 pix.
= 391.32 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.087 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.018
Minimum - Maximum-0.040431097 - 0.082134224
Average (Standard dev.)0.00012400946 (±0.002037359)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 391.32 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: half1 map

Fileemd_60068_half_map_1.map
Annotationhalf1 map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half2 map

Fileemd_60068_half_map_2.map
Annotationhalf2 map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : The Ycf2-FtsHi motor complex from Arabidopsis

EntireName: The Ycf2-FtsHi motor complex from Arabidopsis
Components
  • Complex: The Ycf2-FtsHi motor complex from Arabidopsis

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Supramolecule #1: The Ycf2-FtsHi motor complex from Arabidopsis

SupramoleculeName: The Ycf2-FtsHi motor complex from Arabidopsis / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Arabidopsis thaliana (thale cress)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.4000000000000001 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 156786
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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