Apo Hemophilin from A. baumannii

Experimental Data Snapshot

  • Resolution: 1.87 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

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A Slam-dependent hemophore contributes to heme acquisition in the bacterial pathogen Acinetobacter baumannii.

Bateman, T.J.Shah, M.Ho, T.P.Shin, H.E.Pan, C.Harris, G.Fegan, J.E.Islam, E.A.Ahn, S.K.Hooda, Y.Gray-Owen, S.D.Chen, W.Moraes, T.F.

(2021) Nat Commun 12: 6270-6270

  • DOI: https://doi.org/10.1038/s41467-021-26545-9
  • Primary Citation of Related Structures:  
    7RE4, 7REA, 7RED

  • PubMed Abstract: 

    Nutrient acquisition systems are often crucial for pathogen growth and survival during infection, and represent attractive therapeutic targets. Here, we study the protein machinery required for heme uptake in the opportunistic pathogen Acinetobacter baumannii. We show that the hemO locus, which includes a gene encoding the heme-degrading enzyme, is required for high-affinity heme acquisition from hemoglobin and serum albumin. The hemO locus includes a gene coding for a heme scavenger (HphA), which is secreted by a Slam protein. Furthermore, heme uptake is dependent on a TonB-dependent receptor (HphR), which is important for survival and/or dissemination into the vasculature in a mouse model of pulmonary infection. Our results indicate that A. baumannii uses a two-component receptor system for the acquisition of heme from host heme reservoirs.

  • Organizational Affiliation

    Department of Biochemistry, University of Toronto, Toronto, ON, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
B [auth C],
C [auth E]
254Acinetobacter baumannii NIPH 201Mutation(s): 0 
Gene Names: F922_02812
Find proteins for A0A086I049 (Acinetobacter baumannii)
Explore A0A086I049 
Go to UniProtKB:  A0A086I049
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A086I049
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.87 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.11α = 90
b = 145.56β = 90
c = 153.05γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaMOP-115182

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-17
    Type: Initial release
  • Version 1.1: 2023-10-18
    Changes: Data collection, Refinement description