4G1U image
Deposition Date 2012-07-11
Release Date 2012-12-19
Last Version Date 2024-03-20
Entry Detail
PDB ID:
4G1U
Title:
X-ray structure of the bacterial heme transporter HmuUV from Yersinia pestis
Biological Source:
Source Organism:
Yersinia pestis (Taxon ID: 632)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.01 Å
R-Value Free:
0.29
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Hemin transport system permease protein hmuU
Gene (Uniprot):hmuU
Chain IDs:A, B
Chain Length:357
Number of Molecules:2
Biological Source:Yersinia pestis
Polymer Type:polypeptide(L)
Molecule:Hemin import ATP-binding protein HmuV
Gene (Uniprot):hmuV
Chain IDs:C, D
Chain Length:266
Number of Molecules:2
Biological Source:Yersinia pestis
Ligand Molecules
Primary Citation
X-ray structure of the Yersinia pestis heme transporter HmuUV.
Nat.Struct.Mol.Biol. 19 1310 1315 (2012)
PMID: 23142986 DOI: 10.1038/nsmb.2417

Abstact

HmuUV is a bacterial ATP-binding cassette (ABC) transporter that catalyzes heme uptake into the cytoplasm of the gram-negative pathogen Yersinia pestis. We report the crystal structure of HmuUV at 3.0 Å resolution in a nucleotide-free state, which features a heme translocation pathway in an outward-facing conformation, poised to accept a heme from the cognate periplasmic binding protein HmuT. A new assay allowed us to determine in vitro rates of HmuUV-catalyzed heme transport into proteoliposomes and to establish the role of conserved residues in the translocation pathway of HmuUV and at the interface with HmuT. Differences in architecture relative to the related vitamin B(12) transporter BtuCD suggest an adaptation of HmuUV for its smaller substrate. Our study also suggests that type II ABC importers, which include bacterial iron-siderophore, heme and cobalamin transporters, have a coupling mechanism distinct from that of other ABC transporters.

Legend

Protein

Chemical

Disease

Primary Citation of related structures