Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 136278.83 
• Atom Count: 8499 
• Residue Count: 1246 
• Unique protein chains: 2

4G1U

X-ray structure of the bacterial heme transporter HmuUV from Yersinia pestis

• DOI: 10.2210/pdb4G1U/pdb

• Classification: TRANSPORT PROTEIN/HYDROLASE
• Organism(s): Yersinia pestis
• Expression System: Escherichia coli


• Deposited: 2012-07-11 Released: 2012-12-19 
• Deposition Author(s): Woo, J.-S., Goetz, B.A., Zeltina, A., Locher, K.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.008 Å
• R-Value Free: 0.295 
• R-Value Work: 0.263 

Literature

X-ray structure of the Yersinia pestis heme transporter HmuUV.

Woo, J.-S., Zeltina, A., Goetz, B.A., Locher, K.P.

(2012) Nat.Struct.Mol.Biol. 19: 1310-1315

• PubMed: 23142986 
• DOI: 10.1038/nsmb.2417


• PubMed Abstract: 
  

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.

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Organizational Affiliation: 

Institute of Molecular Biology and Biophysics, Eidgenössische Technische Hochschule (ETH) Zürich, CH-8093 Zürich, Switzerland.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Hemin transport system permease protein hmuU	A, B	357	Yersinia pestis	Mutation(s): 0  Gene Names: hmuU
Membrane protein mpstruct	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  ATP Binding Cassette (ABC) Transporters	Protein:  HmuUV heme transporter
Find proteins for Q56992 (Yersinia pestis) Go to UniProtKB:  Q56992

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Hemin import ATP-binding protein HmuV	C, D	266	Yersinia pestis	Mutation(s): 0  Gene Names: hmuV EC: 3.6.3.-
Membrane protein mpstruct	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  ATP Binding Cassette (ABC) Transporters	Protein:  HmuUV heme transporter
Find proteins for Q56993 (Yersinia pestis) Go to UniProtKB:  Q56993

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
PO4	C, D	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.008 Å
• R-Value Free: 0.295 
• R-Value Work: 0.263 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 100.870	α = 90.00
b = 101.230	β = 91.30
c = 105.210	γ = 90.00

Software Package:

Software Name	Purpose
XSCALE	data scaling
SHELXS	phasing
PDB_EXTRACT	data extraction
PHENIX	refinement
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-07-11 
• Released Date: 2012-12-19 
• Deposition Author(s): Woo, J.-S., Goetz, B.A., Zeltina, A., Locher, K.P.

Revision History 

• Version 1.0: 2012-12-19
  Type: Initial release