5B58

Inward-facing conformation of ABC heme importer BhuUV in complex with periplasmic heme binding protein BhuT from Burkholderia cenocepacia


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.21 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.271 

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Literature

Crystal structure of bacterial haem importer complex in the inward-facing conformation

Naoe, Y.Nakamura, N.Doi, A.Sawabe, M.Nakamura, H.Shiro, Y.Sugimoto, H.

(2016) Nat Commun 7: 13411-13411

  • DOI: 10.1038/ncomms13411
  • Primary Citation of Related Structures:  
    5B58, 5B57

  • PubMed Abstract: 
  • Pathogenic bacteria remove iron from the haem of host tissues and use it as a catalytic center of many enzymes. Haem uptake by pathogenic bacteria is facilitated by the membrane-integrated haem importer, which belongs to the type II ATP-binding cassette (ABC) transporter ...

    Pathogenic bacteria remove iron from the haem of host tissues and use it as a catalytic center of many enzymes. Haem uptake by pathogenic bacteria is facilitated by the membrane-integrated haem importer, which belongs to the type II ATP-binding cassette (ABC) transporter. Here we present crystal structures of Burkholderia cenocepacia haem importer BhuUV complexed with the periplasmic haem-binding protein BhuT and in the absence of BhuT. The transmembrane helices of these structures show an inward-facing conformation, in which the cytoplasmic gate of the haem translocation pathway is completely open. Since this conformation is found in both the haem- and nucleotide-free form, the structure of BhuUV-T provides the post-translocation state and the missing piece in the transport cycle of the type II importer. Structural comparison with the outward-facing conformation reported for the haem importer ortholog HmuUV from Yersenia pestis gives mechanistic insights into conformational transitions and haem secretion during the haem transport cycle.


    Organizational Affiliation

    Department of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigohri, Akoh, Hyogo 678-1297, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Putative hemin ABC transport system, membrane proteinA, B385Burkholderia cenocepacia J2315Mutation(s): 0 
Gene Names: hmuUBCAM2629
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
BhuU/BhuV haem importer, inward facing
Find proteins for B4EKB4 (Burkholderia cenocepacia (strain ATCC BAA-245 / DSM 16553 / LMG 16656 / NCTC 13227 / J2315 / CF5610))
Explore B4EKB4 
Go to UniProtKB:  B4EKB4
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Hemin import ATP-binding protein HmuVC, D273Burkholderia cenocepacia J2315Mutation(s): 0 
Gene Names: hmuVBCAM2630
EC: 3.6.3 (PDB Primary Data), 7.6.2 (UniProt)
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
BhuU/BhuV haem importer, inward facing
Find proteins for B4EKB5 (Burkholderia cenocepacia (strain ATCC BAA-245 / DSM 16553 / LMG 16656 / NCTC 13227 / J2315 / CF5610))
Explore B4EKB5 
Go to UniProtKB:  B4EKB5
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Putative hemin transport system, substrate-binding proteinE [auth T]271Burkholderia cenocepacia J2315Mutation(s): 0 
Gene Names: hmuTBCAM2628
Find proteins for B4EKB3 (Burkholderia cenocepacia (strain ATCC BAA-245 / DSM 16553 / LMG 16656 / NCTC 13227 / J2315 / CF5610))
Explore B4EKB3 
Go to UniProtKB:  B4EKB3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.21 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.269 
  • R-Value Observed: 0.271 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.016α = 90
b = 99.751β = 90
c = 253.496γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
JSPSJapan23121531
JSPSJapan24687015
JSPSJapan25121739
JSPSJapan15H01655

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-23
    Type: Initial release
  • Version 1.1: 2020-02-26
    Changes: Data collection