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- EMDB-44794: E. coli cellulose synthase BcsAG3B6 complex - BcsB focused map -

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Basic information

Entry
Database: EMDB / ID: EMD-44794
TitleE. coli cellulose synthase BcsAG3B6 complex - BcsB focused map
Map dataFocused map- BcsB6
Sample
  • Complex: Bacterial cellulose synthase BcsA-BcsG3-BcsB6 complex
Keywordsphosphoethanolamine (pEtN) / catalytic BcsA-B / c-di-GMP binding protein / membrane proteins / TRANSFERASE
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.0 Å
AuthorsVerma P / Zimmer J
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM144130 United States
CitationJournal: Nat Commun / Year: 2024
Title: Insights into phosphoethanolamine cellulose synthesis and secretion across the Gram-negative cell envelope.
Authors: Preeti Verma / Ruoya Ho / Schuyler A Chambers / Lynette Cegelski / Jochen Zimmer /
Abstract: Phosphoethanolamine (pEtN) cellulose is a naturally occurring modified cellulose produced by several Enterobacteriaceae. The minimal components of the E. coli cellulose synthase complex include the ...Phosphoethanolamine (pEtN) cellulose is a naturally occurring modified cellulose produced by several Enterobacteriaceae. The minimal components of the E. coli cellulose synthase complex include the catalytically active BcsA enzyme, a hexameric semicircle of the periplasmic BcsB protein, and the outer membrane (OM)-integrated BcsC subunit containing periplasmic tetratricopeptide repeats (TPR). Additional subunits include BcsG, a membrane-anchored periplasmic pEtN transferase associated with BcsA, and BcsZ, a periplasmic cellulase of unknown biological function. While cellulose synthesis and translocation by BcsA are well described, little is known about its pEtN modification and translocation across the cell envelope. We show that the N-terminal cytosolic domain of BcsA positions three BcsG copies near the nascent cellulose polymer. Further, the semicircle's terminal BcsB subunit tethers the N-terminus of a single BcsC protein in a trans-envelope secretion system. BcsC's TPR motifs bind a putative cello-oligosaccharide near the entrance to its OM pore. Additionally, we show that only the hydrolytic activity of BcsZ but not the subunit itself is necessary for cellulose secretion, suggesting a secretion mechanism based on enzymatic removal of translocation incompetent cellulose. Lastly, protein engineering introduces cellulose pEtN modification in orthogonal cellulose biosynthetic systems. These findings advance our understanding of pEtN cellulose modification and secretion.
History
DepositionMay 8, 2024-
Header (metadata) releaseFeb 19, 2025-
Map releaseFeb 19, 2025-
UpdateFeb 19, 2025-
Current statusFeb 19, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_44794.png

Downloads & links

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Map

FileDownload / File: emd_44794.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationFocused map- BcsB6
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 360 pix.
= 388.8 Å		1.08 Å/pix.
x 360 pix.
= 388.8 Å		1.08 Å/pix.
x 360 pix.
= 388.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.39
Minimum - Maximum-0.7410817 - 1.4705354
Average (Standard dev.)0.0010762906 (±0.050330482)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 388.80002 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map B

Fileemd_44794_half_map_1.map
AnnotationHalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map A

Fileemd_44794_half_map_2.map
AnnotationHalf map A
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Bacterial cellulose synthase BcsA-BcsG3-BcsB6 complex

EntireName: Bacterial cellulose synthase BcsA-BcsG3-BcsB6 complex
Components
  • Complex: Bacterial cellulose synthase BcsA-BcsG3-BcsB6 complex

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Supramolecule #1: Bacterial cellulose synthase BcsA-BcsG3-BcsB6 complex

SupramoleculeName: Bacterial cellulose synthase BcsA-BcsG3-BcsB6 complex / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Escherichia coli (E. coli)

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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

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 51.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7l2z

Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 39522
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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