5KHN

Crystal structures of the Burkholderia multivorans hopanoid transporter HpnN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.44 Å
  • R-Value Free: 0.319 
  • R-Value Work: 0.283 
  • R-Value Observed: 0.285 

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This is version 1.3 of the entry. See complete history


Literature

Crystal structures of the Burkholderia multivorans hopanoid transporter HpnN.

Kumar, N.Su, C.C.Chou, T.H.Radhakrishnan, A.Delmar, J.A.Rajashankar, K.R.Yu, E.W.

(2017) Proc Natl Acad Sci U S A 114: 6557-6562

  • DOI: 10.1073/pnas.1619660114
  • Primary Citation of Related Structures:  
    5KHN, 5KHS

  • PubMed Abstract: 
  • Strains of the Burkholderia cepacia complex (Bcc) are Gram-negative opportunisitic bacteria that are capable of causing serious diseases, mainly in immunocompromised individuals. Bcc pathogens are intrinsically resistant to multiple antibiotics, including β-lactams, aminoglycosides, fluoroquinolones, and polymyxins ...

    Strains of the Burkholderia cepacia complex (Bcc) are Gram-negative opportunisitic bacteria that are capable of causing serious diseases, mainly in immunocompromised individuals. Bcc pathogens are intrinsically resistant to multiple antibiotics, including β-lactams, aminoglycosides, fluoroquinolones, and polymyxins. They are major pathogens in patients with cystic fibrosis (CF) and can cause severe necrotizing pneumonia, which is often fatal. Hopanoid biosynthesis is one of the major mechanisms involved in multiple antimicrobial resistance of Bcc pathogens. The hpnN gene of B. multivorans encodes an integral membrane protein of the HpnN family of transporters, which is responsible for shuttling hopanoids to the outer membrane. Here, we report crystal structures of B. multivorans HpnN, revealing a dimeric molecule with an overall butterfly shape. Each subunit of the transporter contains 12 transmembrane helices and two periplasmic loops that suggest a plausible pathway for substrate transport. Further analyses indicate that HpnN is capable of shuttling hopanoid virulence factors from the outer leaflet of the inner membrane to the periplasm. Taken together, our data suggest that the HpnN transporter is critical for multidrug resistance and cell wall remodeling in Burkholderia .


    Organizational Affiliation

    Department of Physics and Astronomy, Iowa State University, IA 50011.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RND transporterB [auth A],
A [auth B]
883Burkholderia multivoransMutation(s): 3 
Gene Names: WM33_10510
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.44 Å
  • R-Value Free: 0.319 
  • R-Value Work: 0.283 
  • R-Value Observed: 0.285 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.914α = 90
b = 129.546β = 114.04
c = 111.728γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
DENZOdata reduction
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-06-14
    Type: Initial release
  • Version 1.1: 2017-06-21
    Changes: Database references
  • Version 1.2: 2017-07-05
    Changes: Database references
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence