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| | == Structural highlights == | | == Structural highlights == |
| | <table><tr><td colspan='2'>[[1ie4]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IE4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IE4 FirstGlance]. <br> | | <table><tr><td colspan='2'>[[1ie4]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IE4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IE4 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=T44:3,5,3,5-TETRAIODO-L-THYRONINE'>T44</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1gke|1gke]], [[2rox|2rox]], [[1ict|1ict]]</div></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=T44:3,5,3,5-TETRAIODO-L-THYRONINE'>T44</scene></td></tr> |
| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ie4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ie4 OCA], [https://pdbe.org/1ie4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ie4 RCSB], [https://www.ebi.ac.uk/pdbsum/1ie4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ie4 ProSAT]</span></td></tr> | | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ie4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ie4 OCA], [https://pdbe.org/1ie4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ie4 RCSB], [https://www.ebi.ac.uk/pdbsum/1ie4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ie4 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/TTHY_RAT TTHY_RAT]] Thyroid hormone-binding protein. Probably transports thyroxine from the bloodstream to the brain.<ref>PMID:2309926</ref>
| + | [https://www.uniprot.org/uniprot/TTHY_RAT TTHY_RAT] Thyroid hormone-binding protein. Probably transports thyroxine from the bloodstream to the brain.<ref>PMID:2309926</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| Line 38: |
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| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| | [[Category: Rattus norvegicus]] | | [[Category: Rattus norvegicus]] |
| - | [[Category: Wojtczak, A]] | + | [[Category: Wojtczak A]] |
| - | [[Category: Prealbumin]]
| + | |
| - | [[Category: Rat transthyretin]]
| + | |
| - | [[Category: Thyroxine complex]]
| + | |
| - | [[Category: Transport of thyroid hormone]]
| + | |
| - | [[Category: Transport protein]]
| + | |
| Structural highlights
Function
TTHY_RAT Thyroid hormone-binding protein. Probably transports thyroxine from the bloodstream to the brain.[1]
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
The first observation of the unique environment for thyroxine (T(4)) binding in tetrameric rat transthyretin (rTTR) is reported as determined by X-ray diffraction. These data revealed different modes of hormone binding in the two unique hormone-binding sites in the rat TTR tetramer channel. Differences in the orientation of thyroxine and the position of water molecules in the two binding sites further suggest a mechanism for the docking pathway of the hormone into the channel of TTR. Crystals of the rat transthyretin-thyroxine complex are isomorphous with those reported for apo rTTR and crystallized in the tetragonal space group P4(3)2(1)2 with four independent TTR monomeric subunits in the asymmetric part of the crystal lattice. Data were collected to 2.5 A resolution and the structure was refined to R = 20.9% for 15 384 data in the resolution range 12-2.5 A. Similar to human TTR, the rat protein is also a 54 000 Da tetramer with four identical polypeptide chains of 127 amino-acid residues. Of the 22 amino-acid residues which differ between the human and rat sequences, none are in the thyroxine-binding domains. Analysis of these structural data reveals that the tertiary structure is similar to that of hTTR, with only small differences in the flexible loop regions on the surface of the structure. Conformational changes of the amino acids in the channel result in a hydrogen-bonded network that connects the two binding domains, in contrast to the hydrogen bonds formed along the tetramer interface in the apo transthyretin structure. These changes suggest a mechanism for the signal transmission between thyroxine-binding domains.
Structure of rat transthyretin (rTTR) complex with thyroxine at 2.5 A resolution: first non-biased insight into thyroxine binding reveals different hormone orientation in two binding sites.,Wojtczak A, Cody V, Luft JR, Pangborn W Acta Crystallogr D Biol Crystallogr. 2001 Aug;57(Pt 8):1061-70. Epub 2001, Jul 23. PMID:11468389[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Schreiber G, Aldred AR, Jaworowski A, Nilsson C, Achen MG, Segal MB. Thyroxine transport from blood to brain via transthyretin synthesis in choroid plexus. Am J Physiol. 1990 Feb;258(2 Pt 2):R338-45. PMID:2309926
- ↑ Wojtczak A, Cody V, Luft JR, Pangborn W. Structure of rat transthyretin (rTTR) complex with thyroxine at 2.5 A resolution: first non-biased insight into thyroxine binding reveals different hormone orientation in two binding sites. Acta Crystallogr D Biol Crystallogr. 2001 Aug;57(Pt 8):1061-70. Epub 2001, Jul 23. PMID:11468389
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