4KKS

Crystal Structure of BesA (C2 form)

• PDB DOI: https://doi.org/10.2210/pdb4KKS/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Borreliella burgdorferi B31
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-05-06 Released: 2013-07-10 
• Deposition Author(s): Greene, N.P., Hinchliffe, P., Crow, A., Ababou, A., Hughes, C., Koronakis, V.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.286 
• R-Value Work: 0.206 
• R-Value Observed: 0.210 

Starting Model: experimental

Literature

Structure of an atypical periplasmic adaptor from a multidrug efflux pump of the spirochete Borrelia burgdorferi.

Greene, N.P., Hinchliffe, P., Crow, A., Ababou, A., Hughes, C., Koronakis, V.

(2013) FEBS Lett 587: 2984-2988

• PubMed: 23851070 
• DOI: https://doi.org/10.1016/j.febslet.2013.06.056
• Primary Citation of Related Structures:  
  4KKS, 4KKT, 4KKU


• PubMed Abstract: 
  

  Periplasmic adaptor proteins are essential components of bacterial tripartite multidrug efflux pumps. Here we report the 2.35 Å resolution crystal structure of the BesA adaptor from the spirochete Borrelia burgdorferi solved using selenomethionine derivatized protein. BesA shows the archetypal linear, flexible, multi-domain architecture evident among proteobacteria and retains the lipoyl, β-barrel and membrane-proximal domains that interact with the periplasmic domains of the inner membrane transporter. However, it lacks the α-hairpin domain shown to establish extensive coiled-coil interactions with the periplasmic entrance helices of the outer membrane-anchored TolC exit duct. This has implications for the modelling of assembled tripartite efflux pumps.

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Organizational Affiliation: 

Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 32.61 kDa 
• Atom Count: 2,157 
• Modelled Residue Count: 275 
• Deposited Residue Count: 296 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Membrane fusion protein	A	296	Borreliella burgdorferi B31	Mutation(s): 0  Gene Names: BB_0141
UniProt
Find proteins for O51166 (Borreliella burgdorferi (strain ATCC 35210 / DSM 4680 / CIP 102532 / B31)) Explore O51166  Go to UniProtKB:  O51166

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	B [auth A]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.286 
• R-Value Work: 0.206 
• R-Value Observed: 0.210 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 83.2	α = 90
b = 52.5	β = 98.04
c = 76.53	γ = 90

Software Package:

Software Name	Purpose
MxCuBE	data collection
MOLREP	phasing
REFMAC	refinement
MOSFLM	data reduction
Aimless	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2013-07-10 
Deposition Author(s): Greene, N.P., Hinchliffe, P., Crow, A., Ababou, A., Hughes, C., Koronakis, V.

Revision History  

• Version 1.0: 2013-07-10
  Type: Initial release
  
• Version 1.1: 2013-07-31
  Changes: Database references
• Version 1.2: 2013-09-25
  Changes: Database references
• Version 1.3: 2023-09-20
  Changes: Data collection, Database references, Derived calculations, Refinement description