6TZK

Bacterial cellulose synthase outermembrane channel BcsC with terminal TPR repeat


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.852 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.164 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Architecture of the Cellulose Synthase Outer Membrane Channel and Its Association with the Periplasmic TPR Domain.

Acheson, J.F.Derewenda, Z.S.Zimmer, J.

(2019) Structure 27: 1855

  • DOI: 10.1016/j.str.2019.09.008

  • PubMed Abstract: 
  • Extracellular bacterial cellulose contributes to biofilm stability and to the integrity of the bacterial cell envelope. In Gram-negative bacteria, cellulose is synthesized and secreted by a multi-component cellulose synthase complex. The BcsA subunit ...

    Extracellular bacterial cellulose contributes to biofilm stability and to the integrity of the bacterial cell envelope. In Gram-negative bacteria, cellulose is synthesized and secreted by a multi-component cellulose synthase complex. The BcsA subunit synthesizes cellulose and also transports the polymer across the inner membrane. Translocation across the outer membrane occurs through the BcsC porin, which extends into the periplasm via 19 tetra-tricopeptide repeats (TPR). We present the crystal structure of a truncated BcsC, encompassing the last TPR repeat and the complete outer membrane channel domain, revealing a 16-stranded, β barrel pore architecture. The pore is blocked by an extracellular gating loop, while the extended C terminus inserts deeply into the channel and positions a conserved Trp residue near its extracellular exit. The channel is lined with hydrophilic and aromatic residues suggesting a mechanism for facilitated cellulose diffusion based on aromatic stacking and hydrogen bonding.


    Organizational Affiliation

    University of Virginia, School of Medicine, Department of Molecular Physiology and Biological Physics, Charlottesville, VA 22903, USA. Electronic address: jochen_zimmer@virginia.edu.,University of Virginia, School of Medicine, Department of Molecular Physiology and Biological Physics, Charlottesville, VA 22903, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cellulose synthase operon protein C
A
455Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: bcsC (yhjL)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
BcsC cellulose synthase outer membrane channel
Find proteins for P37650 (Escherichia coli (strain K12))
Go to UniProtKB:  P37650
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEZ
Query on HEZ

Download SDF File 
Download CCD File 
A
HEXANE-1,6-DIOL
C6 H14 O2
XXMIOPMDWAUFGU-UHFFFAOYSA-N
 Ligand Interaction
C8E
Query on C8E

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Download CCD File 
A
(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
 Ligand Interaction
PE5
Query on PE5

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Download CCD File 
A
3,6,9,12,15,18,21,24-OCTAOXAHEXACOSAN-1-OL
2-(2-{2-[2-(2-{2-[2-(2-ETHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHANOL, POLYETHYLENE GLYCOL PEG400
C18 H38 O9
CUDPPTPIUWYGFI-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
LMT
Query on LMT

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Download CCD File 
A
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
 Ligand Interaction
3PE
Query on 3PE

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Download CCD File 
A
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE
3-SN-PHOSPHATIDYLETHANOLAMINE
C41 H82 N O8 P
LVNGJLRDBYCPGB-LDLOPFEMSA-N
 Ligand Interaction
Modified Residues  4 Unique
IDChainsTypeFormula2D DiagramParent
HEZ
Query on HEZ
A
NON-POLYMERC6 H14 O2

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C8E
Query on C8E
A
NON-POLYMERC16 H34 O5

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PE5
Query on PE5
A
NON-POLYMERC18 H38 O9

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LMT
Query on LMT
A
D-SACCHARIDEC24 H46 O11

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.852 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.164 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 87.713α = 90.00
b = 73.721β = 90.00
c = 85.777γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data scaling
HKL-3000data reduction
PDB_EXTRACTdata extraction
PHENIXrefinement
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5R01GM101001
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1F32GM126647-01

Revision History 

  • Version 1.0: 2019-10-23
    Type: Initial release
  • Version 1.1: 2019-12-18
    Type: Database references
  • Version 1.2: 2020-01-01
    Type: Author supporting evidence