4IFF

Structural organization of FtsB, a transmembrane protein of the bacterial divisome


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Organization of FtsB, a Transmembrane Protein of the Bacterial Divisome.

Lapointe, L.M.Taylor, K.C.Subramaniam, S.Khadria, A.Rayment, I.Senes, A.

(2013) Biochemistry 52: 2574-2585

  • DOI: 10.1021/bi400222r

  • PubMed Abstract: 
  • We report the first structural analysis of an integral membrane protein of the bacterial divisome. FtsB is a single-pass membrane protein with a periplasmic coiled coil. Its heterologous association with its partner FtsL represents an essential event ...

    We report the first structural analysis of an integral membrane protein of the bacterial divisome. FtsB is a single-pass membrane protein with a periplasmic coiled coil. Its heterologous association with its partner FtsL represents an essential event for the recruitment of the late components to the division site. Using a combination of mutagenesis, computational modeling, and X-ray crystallography, we determined that FtsB self-associates, and we investigated its structural organization. We found that the transmembrane domain of FtsB homo-oligomerizes through an evolutionarily conserved interaction interface where a polar residue (Gln 16) plays a critical role through the formation of an interhelical hydrogen bond. The crystal structure of the periplasmic domain, solved as a fusion with Gp7, shows that 30 juxta-membrane amino acids of FtsB form a canonical coiled coil. The presence of conserved Gly residue in the linker region suggests that flexibility between the transmembrane and coiled coil domains is functionally important. We hypothesize that the transmembrane helices of FtsB form a stable dimeric core for its association with FtsL into a higher-order oligomer and that FtsL is required to stabilize the periplasmic domain of FtsB, leading to the formation of a complex that is competent for binding to FtsQ, and to their consequent recruitment to the divisome. The study provides an experimentally validated structural model and identifies point mutations that disrupt association, thereby establishing important groundwork for the functional characterization of FtsB in vivo.


    Organizational Affiliation

    Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison Wisconsin, 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fusion of phage phi29 Gp7 protein and Cell division protein FtsB
A, B, C, D
86Bacillus phage phi29Escherichia coli (strain K12)
This entity is chimeric
Mutation(s): 0 
Gene Names: 7, ftsB (ygbQ)
Find proteins for P13848 (Bacillus phage phi29)
Go to UniProtKB:  P13848
Find proteins for P0A6S5 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6S5
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, C
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 87.577α = 90.00
b = 87.577β = 90.00
c = 185.110γ = 120.00
Software Package:
Software NamePurpose
HKL-3000data scaling
HKL-3000data reduction
PHASERphasing
HKL-3000data collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-05-22
    Type: Database references
  • Version 1.2: 2017-08-02
    Type: Refinement description, Source and taxonomy