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- EMDB-12525: Structure of an intact ESX-5 inner membrane complex, EccC contracted -

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Basic information

Entry
Database: EMDB / ID: EMD-12525
TitleStructure of an intact ESX-5 inner membrane complex, EccC contracted
Map data3D refinement map.
Sample
  • Complex: Intact ESX-5 inner membrane complex, EccC5 contracted
Function / homology
Function and homology information


Hydrolases; Acting on acid anhydrides / Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases / peptidoglycan-based cell wall / protein processing / hydrolase activity / serine-type endopeptidase activity / ATP binding / plasma membrane
Similarity search - Function
Type VII secretion system peptidase S8A, mycosin / Type VII secretion system EccB / Type VII secretion system EccB, repeat 3 domain / Type VII secretion system EccB, repeat 1 domain / Type VII secretion system ESX-1, transport TM domain B / Serine proteases, subtilase family, histidine active site. / Serine proteases, subtilase family, aspartic acid active site. / Peptidase S8, subtilisin, Asp-active site / Peptidase S8, subtilisin-related / Serine proteases, subtilase domain profile. ...Type VII secretion system peptidase S8A, mycosin / Type VII secretion system EccB / Type VII secretion system EccB, repeat 3 domain / Type VII secretion system EccB, repeat 1 domain / Type VII secretion system ESX-1, transport TM domain B / Serine proteases, subtilase family, histidine active site. / Serine proteases, subtilase family, aspartic acid active site. / Peptidase S8, subtilisin, Asp-active site / Peptidase S8, subtilisin-related / Serine proteases, subtilase domain profile. / Peptidase S8/S53 domain superfamily / Peptidase S8/S53 domain / Subtilase family
Similarity search - Domain/homology
Mycosin-5 / ESX-5 secretion system ATPase EccB5
Similarity search - Component
Biological speciesMycobacterium tuberculosis H37Rv (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 7.58 Å
AuthorsBunduc CM / Fahrenkamp D / Wald J / Ummels R / Bitter W / Houben ENG / Marlovits TC
Funding support Germany, Netherlands, European Union, 4 items
OrganizationGrant numberCountry
German Research Foundation (DFG)INST 152/774-1 FUGG Germany
Netherlands Organisation for Scientific Research (NWO)864.12.006 Netherlands
H2020 Marie Curie Actions of the European Commission101030373European Union
German Research Foundation (DFG)FA1518/2-1 Germany
CitationJournal: Nature / Year: 2021
Title: Structure and dynamics of a mycobacterial type VII secretion system.
Authors: Catalin M Bunduc / Dirk Fahrenkamp / Jiri Wald / Roy Ummels / Wilbert Bitter / Edith N G Houben / Thomas C Marlovits /
Abstract: Mycobacterium tuberculosis is the cause of one of the most important infectious diseases in humans, which leads to 1.4 million deaths every year. Specialized protein transport systems-known as ...Mycobacterium tuberculosis is the cause of one of the most important infectious diseases in humans, which leads to 1.4 million deaths every year. Specialized protein transport systems-known as type VII secretion systems (T7SSs)-are central to the virulence of this pathogen, and are also crucial for nutrient and metabolite transport across the mycobacterial cell envelope. Here we present the structure of an intact T7SS inner-membrane complex of M. tuberculosis. We show how the 2.32-MDa ESX-5 assembly, which contains 165 transmembrane helices, is restructured and stabilized as a trimer of dimers by the MycP protease. A trimer of MycP caps a central periplasmic dome-like chamber that is formed by three EccB dimers, with the proteolytic sites of MycP facing towards the cavity. This chamber suggests a central secretion and processing conduit. Complexes without MycP show disruption of the EccB periplasmic assembly and increased flexibility, which highlights the importance of MycP for complex integrity. Beneath the EccB-MycP chamber, dimers of the EccC ATPase assemble into three bundles of four transmembrane helices each, which together seal the potential central secretion channel. Individual cytoplasmic EccC domains adopt two distinctive conformations that probably reflect different secretion states. Our work suggests a previously undescribed mechanism of protein transport and provides a structural scaffold to aid in the development of drugs against this major human pathogen.
History
DepositionFeb 28, 2021-
Header (metadata) releaseMay 26, 2021-
Map releaseMay 26, 2021-
UpdateJun 2, 2021-
Current statusJun 2, 2021Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.004
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.004
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_12525.png

Downloads & links

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Map

FileDownload / File: emd_12525.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotation3D refinement map.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 400 pix.
= 440. Å		1.1 Å/pix.
x 400 pix.
= 440. Å		1.1 Å/pix.
x 400 pix.
= 440. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0035 / Movie #1: 0.004
Minimum - Maximum-0.00992267 - 0.024521146
Average (Standard dev.)0.00019022178 (±0.0019449432)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 440.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.11.11.1
M x/y/z400400400
origin x/y/z0.0000.0000.000
length x/y/z440.000440.000440.000
α/β/γ90.00090.00090.000
start NX/NY/NZ7297100
NX/NY/NZ181127145
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS400400400
D min/max/mean-0.0100.0250.000

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Supplemental data

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Half map: Half1 of 3D refinement map.

Fileemd_12525_half_map_1.map
AnnotationHalf1 of 3D refinement map.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half2 of 3D refinement map.

Fileemd_12525_half_map_2.map
AnnotationHalf2 of 3D refinement 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 : Intact ESX-5 inner membrane complex, EccC5 contracted

EntireName: Intact ESX-5 inner membrane complex, EccC5 contracted
Components
  • Complex: Intact ESX-5 inner membrane complex, EccC5 contracted

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Supramolecule #1: Intact ESX-5 inner membrane complex, EccC5 contracted

SupramoleculeName: Intact ESX-5 inner membrane complex, EccC5 contracted / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Mycobacterium tuberculosis H37Rv (bacteria)
Recombinant expressionOrganism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 2.32 MDa

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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: 8
VitrificationCryogen name: ETHANE-PROPANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 59.5 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 7.58 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 5874
Initial angle assignmentType: OTHER / Details: Rotationally averaged 3D structure.
Final angle assignmentType: MAXIMUM LIKELIHOOD

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