2nwx | pdb_00002nwx

Crystal structure of GltPh in complex with L-aspartate and sodium ions

spinqualitylabelsall models 2nwx, resolution 3.29Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2nwx is a 3 chain structure with sequence from Pyrococcus horikoshii. The March 2014 RCSB PDB Molecule of the Month feature on Neurotransmitter Transporters by David Goodsell is 10.2210/rcsb_pdb/mom_2014_3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.29Å Ligands: ASP, NA, PLM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GLT_PYRHO Sodium-dependent, high-affinity amino acid transporter that mediates aspartate uptake (PubMed:17435767, PubMed:19380583, PubMed:17230192, Ref.11). Has only very low glutamate transport activity (PubMed:19380583, PubMed:17230192). Functions as a symporter that transports one amino acid molecule together with two or three Na(+) ions, resulting in electrogenic transport (PubMed:17435767, PubMed:19380583, Ref.11). Na(+) binding enhances the affinity for aspartate (PubMed:19380583, Ref.11). Mediates Cl(-) flux that is not coupled to amino acid transport; this avoids the accumulation of negative charges due to aspartate and Na(+) symport (PubMed:17435767). In contrast to mammalian homologs, transport does not depend on pH or K(+) ions (PubMed:19380583). [PDB:4P19] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Secondary transporters are integral membrane proteins that catalyse the movement of substrate molecules across the lipid bilayer by coupling substrate transport to one or more ion gradients, thereby providing a mechanism for the concentrative uptake of substrates. Here we describe crystallographic and thermodynamic studies of Glt(Ph), a sodium (Na+)-coupled aspartate transporter, defining sites for aspartate, two sodium ions and d,l-threo-beta-benzyloxyaspartate, an inhibitor. We further show that helical hairpin 2 is the extracellular gate that controls access of substrate and ions to the internal binding sites. At least two sodium ions bind in close proximity to the substrate and these sodium-binding sites, together with the sodium-binding sites in another sodium-coupled transporter, LeuT, define an unwound alpha-helix as the central element of the ion-binding motif, a motif well suited to the binding of sodium and to participation in conformational changes that accompany ion binding and unbinding during the transport cycle. Coupling substrate and ion binding to extracellular gate of a sodium-dependent aspartate transporter.,Boudker O, Ryan RM, Yernool D, Shimamoto K, Gouaux E Nature. 2007 Jan 25;445(7126):387-93. Epub 2007 Jan 17. PMID:17230192 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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