6TL2 image
Entry Detail
PDB ID:
6TL2
Title:
Crystal structure of Eremococcus coleocola manganese transporter in complex with an aromatic bis-isothiourea substituted compound
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2019-11-29
Release Date:
2019-12-18
Method Details:
Experimental Method:
Resolution:
3.80 Å
R-Value Free:
0.25
R-Value Work:
0.21
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Divalent metal cation transporter MntH
Chain IDs:A
Chain Length:494
Number of Molecules:1
Biological Source:Eremococcus coleocola ACS-139-V-Col8
Ligand Molecules
Primary Citation
Mechanistic basis of the inhibition of SLC11/NRAMP-mediated metal ion transport by bis-isothiourea substituted compounds.
Elife 8 ? ? (2019)
PMID: 31804182 DOI: 10.7554/eLife.51913

Abstact

In humans, the divalent metal ion transporter-1 (DMT1) mediates the transport of ferrous iron across the apical membrane of enterocytes. Hence, its inhibition could be beneficial for the treatment of iron overload disorders. Here we characterize the interaction of aromatic bis-isothiourea-substituted compounds with human DMT1 and its prokaryotic homologue EcoDMT. Both transporters are inhibited by a common competitive mechanism with potencies in the low micromolar range. The crystal structure of EcoDMT in complex with a brominated derivative defines the binding of the inhibitor to an extracellular pocket of the transporter in direct contact with residues of the metal ion coordination site, thereby interfering with substrate loading and locking the transporter in its outward-facing state. Mutagenesis and structure-activity relationships further support the observed interaction mode and reveal species-dependent differences between pro- and eukaryotic transporters. Together, our data provide the first detailed mechanistic insight into the pharmacology of SLC11/NRAMP transporters.

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Primary Citation of related structures