6TZK

Bacterial cellulose synthase outermembrane channel BcsC with terminal TPR repeat


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.165 

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Ligand Structure Quality Assessment 


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
  • Primary Citation of Related Structures:  
    6TZK

  • 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 synthesizes cellulose and also transports the polymer across the inner membrane ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cellulose synthase operon protein CA455Escherichia coli K-12Mutation(s): 0 
Gene Names: bcsCyhjLb3530JW5942
Membrane Entity: Yes 
UniProt
Find proteins for P37650 (Escherichia coli (strain K12))
Explore P37650 
Go to UniProtKB:  P37650
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3PE (Subject of Investigation/LOI)
Query on 3PE

Download Ideal Coordinates CCD File 
F [auth A]1,2-Distearoyl-sn-glycerophosphoethanolamine
C41 H82 N O8 P
LVNGJLRDBYCPGB-LDLOPFEMSA-N
 Ligand Interaction
LMT (Subject of Investigation/LOI)
Query on LMT

Download Ideal Coordinates CCD File 
B [auth A]DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
 Ligand Interaction
PE5
Query on PE5

Download Ideal Coordinates CCD File 
D [auth A]3,6,9,12,15,18,21,24-OCTAOXAHEXACOSAN-1-OL
C18 H38 O9
CUDPPTPIUWYGFI-UHFFFAOYSA-N
 Ligand Interaction
C8E (Subject of Investigation/LOI)
Query on C8E

Download Ideal Coordinates CCD File 
E [auth A](HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
 Ligand Interaction
HEZ
Query on HEZ

Download Ideal Coordinates CCD File 
C [auth A]HEXANE-1,6-DIOL
C6 H14 O2
XXMIOPMDWAUFGU-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
G [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.713α = 90
b = 73.721β = 90
c = 85.777γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment  



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  (Full details and data files)

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