3FTJ

Crystal structure of the periplasmic region of MacB from Actinobacillus actinomycetemcomitans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.999 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure of the periplasmic region of MacB, a noncanonic ABC transporter

Xu, Y.Sim, S.-H.Nam, K.H.Jin, X.L.Kim, H.-M.Hwang, K.Y.Lee, K.Ha, N.-C.

(2009) Biochemistry 48: 5218-5225

  • DOI: 10.1021/bi900415t

  • PubMed Abstract: 
  • MacB is a noncanonic ABC-type transporter within Gram-negative bacteria, which is responsible both for the efflux of macrolide antibiotics and for the secretion of heat-stable enterotoxin II. In Escherichia coli, MacB requires the membrane fusion pro ...

    MacB is a noncanonic ABC-type transporter within Gram-negative bacteria, which is responsible both for the efflux of macrolide antibiotics and for the secretion of heat-stable enterotoxin II. In Escherichia coli, MacB requires the membrane fusion protein MacA and the multifunctional outer membrane channel TolC to pump substrates to the external medium. Sequence analysis of MacB suggested that MacB has a relatively large periplasmic region. To gain insight into how MacB assembles with MacA and TolC, we determined the crystal structure of the periplasmic region of Actinobacillus actinomycetemcomitans MacB. Fold matching program reveals that parts of the MacB periplasmic region have structural motifs in common with the RND-type transporter AcrB. Since it behaved as a monomer in solution, our finding is consistent with the dimeric nature of full-length MacB, providing an insight into the assembly in the tripartite efflux pump.


    Organizational Affiliation

    College of Pharmacy and Research Institute for Drug Development, Pusan National University, Busan 609-735, Republic of Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Macrolide export ATP-binding/permease protein macB
A
226Aggregatibacter actinomycetemcomitansMutation(s): 0 
Gene Names: macB
EC: 7.6.2.-
Find proteins for Q2EHL8 (Aggregatibacter actinomycetemcomitans)
Go to UniProtKB:  Q2EHL8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.999 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.200 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 108.444α = 90.00
b = 108.444β = 90.00
c = 92.892γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
HKL-2000data scaling
PHENIXrefinement
HKL-2000data reduction
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-01-13 
  • Released Date: 2009-05-26 
  • Deposition Author(s): Xu, Y., Ha, N.C.

Revision History 

  • Version 1.0: 2009-05-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance