2nww
From Proteopedia
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[[Image:2nww.gif|left|200px]] | [[Image:2nww.gif|left|200px]] | ||
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'''Crystal structure of GltPh in complex with TBOA''' | '''Crystal structure of GltPh in complex with TBOA''' | ||
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[[Category: Shimamoto, K.]] | [[Category: Shimamoto, K.]] | ||
[[Category: Yernool, D.]] | [[Category: Yernool, D.]] | ||
| - | [[Category: | + | [[Category: Amino acid transporter]] |
| - | [[Category: | + | [[Category: Aspartate transporter]] |
| - | [[Category: | + | [[Category: Binding site]] |
| - | [[Category: | + | [[Category: Inhibitor binding binding]] |
| - | [[Category: | + | [[Category: Transmembrane transporter]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 10:00:49 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 07:00, 4 May 2008
Crystal structure of GltPh in complex with TBOA
Overview
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.
About this Structure
2NWW is a Single protein structure of sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA.
Reference
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 Page seeded by OCA on Sun May 4 10:00:49 2008
