2X79 image
Deposition Date 2010-02-25
Release Date 2010-05-05
Last Version Date 2024-10-23
Entry Detail
PDB ID:
2X79
Title:
Inward facing conformation of Mhp1
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.80 Å
R-Value Free:
0.31
R-Value Work:
0.27
R-Value Observed:
0.27
Space Group:
P 61
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Hydantoin permease
Gene (Uniprot):hyuP
Chain IDs:A
Chain Length:501
Number of Molecules:1
Biological Source:Microbacterium liquefaciens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
Primary Citation
Molecular Basis of Alternating Access Membrane Transport by the Sodium-Hydantoin Transporter Mhp1.
Science 328 470 ? (2010)
PMID: 20413494 DOI: 10.1126/SCIENCE.1186303

Abstact

The structure of the sodium-benzylhydantoin transport protein Mhp1 from Microbacterium liquefaciens comprises a five-helix inverted repeat, which is widespread among secondary transporters. Here, we report the crystal structure of an inward-facing conformation of Mhp1 at 3.8 angstroms resolution, complementing its previously described structures in outward-facing and occluded states. From analyses of the three structures and molecular dynamics simulations, we propose a mechanism for the transport cycle in Mhp1. Switching from the outward- to the inward-facing state, to effect the inward release of sodium and benzylhydantoin, is primarily achieved by a rigid body movement of transmembrane helices 3, 4, 8, and 9 relative to the rest of the protein. This forms the basis of an alternating access mechanism applicable to many transporters of this emerging superfamily.

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Primary Citation of related structures