[English] 日本語
Yorodumi
- EMDB-69923: Sub-tomogram average of pre-firing AlgoCIS on the E. pacifica surface. -

+
Open data


ID or keywords:

Loading...

-
Basic information

Entry
Database: EMDB / ID: EMD-69923
TitleSub-tomogram average of pre-firing AlgoCIS on the E. pacifica surface.
Map data
Sample
  • Complex: Contractile injection system in marine bacterium Algoriphagus machipongonensis
KeywordsContractile injection system / CryoEM / marine bacterium / STRUCTURAL PROTEIN
Biological speciesAlgoriphagus machipongonensis (bacteria)
Methodsubtomogram averaging / cryo EM / Resolution: 60.0 Å
AuthorsXu J / Ericson CF / Toenshoff ER / Pilhofer M
Funding support Switzerland, European Union, 4 items
OrganizationGrant numberCountry
Swiss National Science Foundation31003A_179255 Switzerland
Swiss National Science Foundation310030_212592 Switzerland
European Research Council (ERC)679209European Union
European Research Council (ERC)101000232European Union
CitationJournal: Nat Commun / Year: 2026
Title: Stepwise firing mechanism of an extracellular contractile injection system.
Authors: Jingwei Xu / Charles F Ericson / Elena R Toenshoff / Martin Pilhofer /
Abstract: Contractile injection systems (CISs) mediate cell-cell interactions and are widespread among bacteria and archaea. These phage tail-like macromolecular machines puncture their target by a tube that ...Contractile injection systems (CISs) mediate cell-cell interactions and are widespread among bacteria and archaea. These phage tail-like macromolecular machines puncture their target by a tube that is propelled by a contractile sheath. The mechanism underlying CIS firing, which starts with target binding and ends with sheath contraction, remains unclear. Here, we investigate the extracellular CIS from Algoriphagus machipongonensis (AlgoCIS) by a multimodal cryo-electron microscopy approach and structure-guided engineering, which allowed us to arrest AlgoCIS in multiple intermediate states of firing. Together with the post-firing structure, our data suggest a stepwise firing mechanism involving all structural modules: signal propagation starts with the binding of the tail-fibers, followed by opening of the cage, an expansion of the baseplate iris, and resulting in sheath contraction and the release of cap adaptor. Our study will serve as a framework for understanding the firing mechanism of diverse CISs and will facilitate the engineering of CISs for biomedical applications.
History
DepositionMar 25, 2026-
Header (metadata) releaseMay 6, 2026-
Map releaseMay 6, 2026-
UpdateMay 6, 2026-
Current statusMay 6, 2026Processing site: PDBj / Status: Released

-
Structure visualization

Supplemental images

emd_69923.png

Downloads & links

-
Map

FileDownload / File: emd_69923.map.gz / Format: CCP4 / Size: 6.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
18.04 Å/pix.
x 120 pix.
= 2164.8 Å		18.04 Å/pix.
x 120 pix.
= 2164.8 Å		18.04 Å/pix.
x 120 pix.
= 2164.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 18.04 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.15
Minimum - Maximum-2.6834292 - 3.8791971
Average (Standard dev.)0.0031893707 (±0.18185921)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions120120120
Spacing120120120
CellA=B=C: 2164.8 Å
α=β=γ: 90.0 °

-
Supplemental data

-
Mask #1

Fileemd_69923_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

-
Half map: #1

Fileemd_69923_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

-
Half map: #2

Fileemd_69923_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

-
Sample components

-
Entire : Contractile injection system in marine bacterium Algoriphagus mac...

EntireName: Contractile injection system in marine bacterium Algoriphagus machipongonensis
Components
  • Complex: Contractile injection system in marine bacterium Algoriphagus machipongonensis

-
Supramolecule #1: Contractile injection system in marine bacterium Algoriphagus mac...

SupramoleculeName: Contractile injection system in marine bacterium Algoriphagus machipongonensis
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Algoriphagus machipongonensis (bacteria)

-
Experimental details

-
Structure determination

Methodcryo EM
Processingsubtomogram averaging
Aggregation stateparticle

-
Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE-PROPANE

-
Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 3.17 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 8.0 µm / Nominal defocus min: 5.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

-
Image processing

Final reconstructionApplied symmetry - Point group: C6 (6 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 60.0 Å / Resolution method: OTHER / Software - Name: RELION (ver. 4.0)
Details: Since there are not so many particles, we can not confidently evaluate the resolution. We therefore estimate that the resolution is ~60 Angstrom.
Number subtomograms used: 304
ExtractionNumber tomograms: 65 / Number images used: 304 / Software - Name: Dynamo
CTF correctionType: NONE
Final angle assignmentType: ANGULAR RECONSTITUTION

+
About Yorodumi

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi

Thousand views of thousand structures

  • Yorodumi is a browser for structure data from EMDB, PDB, SASBDB, etc.
  • This page is also the successor to EM Navigator detail page, and also detail information page/front-end page for Omokage search.
  • The word "yorodu" (or yorozu) is an old Japanese word meaning "ten thousand". "mi" (miru) is to see.

Related info.:EMDB / PDB / SASBDB / Comparison of 3 databanks / Yorodumi Search / Aug 31, 2016. New EM Navigator & Yorodumi / Yorodumi Papers / Jmol/JSmol / Function and homology information / Changes in new EM Navigator and Yorodumi

Read more