4d1a | pdb_00004d1a

STRUCTURE OF MHP1, A NUCLEOBASE-CATION-SYMPORT-1 FAMILY TRANSPORTER, IN A CLOSED CONFORMATION WITH INDOLYLMETHYL-HYDANTOIN

spinqualitylabelsall models 4d1a, resolution 3.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4d1a is a 1 chain structure with sequence from Microbacterium liquefaciens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.4Å Ligands: I5H, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HYUP_MICLQ Nucleobase-proton symporter that mediates the sodium-dependent binding and uptake of 5-aryl-substituted hydantoin compounds (PubMed:16621827, PubMed:24952894). 5-indolyl methyl hydantoin and 5-benzyl hydantoin are the preferred substrates, with selectivity for a hydrophobic substituent in position 5 of hydantoin and for the L isomer over the D isomer (PubMed:16621827, PubMed:24952894). Publication Abstract from PubMed The hydantoin transporter Mhp1 is a sodium-coupled secondary active transport protein of the nucleobase-cation-symport family and a member of the widespread 5-helix inverted repeat superfamily of transporters. The structure of Mhp1 was previously solved in three different conformations providing insight into the molecular basis of the alternating access mechanism. Here, we elucidate detailed events of substrate binding, through a combination of crystallography, molecular dynamics, site-directed mutagenesis, biochemical/biophysical assays, and the design and synthesis of novel ligands. We show precisely where 5-substituted hydantoin substrates bind in an extended configuration at the interface of the bundle and hash domains. They are recognised through hydrogen bonds to the hydantoin moiety and the complementarity of the 5-substituent for a hydrophobic pocket in the protein. Furthermore, we describe a novel structure of an intermediate state of the protein with the external thin gate locked open by an inhibitor, 5-(2-naphthylmethyl)-L-hydantoin, which becomes a substrate when leucine 363 is changed to an alanine. We deduce the molecular events that underlie acquisition and transport of a ligand by Mhp1. Molecular mechanism of ligand recognition by membrane transport protein, Mhp1.,Simmons KJ, Jackson SM, Brueckner F, Patching SG, Beckstein O, Ivanova E, Geng T, Weyand S, Drew D, Lanigan J, Sharples DJ, Sansom MS, Iwata S, Fishwick CW, Johnson AP, Cameron AD, Henderson PJ EMBO J. 2014 Jun 21. pii: e201387557. PMID:24952894 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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