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| - | [[Image:1zd6.gif|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1zd6| PDB=1zd6 | SCENE= }} | | {{STRUCTURE_1zd6| PDB=1zd6 | SCENE= }} |
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| - | '''Crystal structure of human transthyretin with bound chloride'''
| + | ===Crystal structure of human transthyretin with bound chloride=== |
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| - | ==Overview==
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| - | Transthyretin amyloid formation occurs through a process of tetramer destabilization and partial unfolding. Small molecules, including the natural ligand thyroxine, stabilize the tetrameric form of the protein, and serve as inhibitors of amyloid formation. Crucial for TTR's ligand-binding properties are its three halogen-binding sites situated at the hormone-binding channel. In this study, we have performed a structural characterization of the binding of two halides, iodide and chloride, to TTR. Chlorides are known to shield charge repulsions at the tetrameric interface of TTR, which improve tetramer stability of the protein. Our study shows that iodides, like chlorides, provide tetramer stabilization in a concentration-dependent manner and at concentrations approximately 15-fold below that of chlorides. To elucidate binding sites of the halides, we took advantage of the anomalous scattering of iodide and used the single-wavelength anomalous dispersion (SAD) method to solve the iodide-bound TTR structure at 1.8 A resolution. The structure of chloride-bound TTR was determined at 1.9 A resolution using difference Fourier techniques. The refined structures showed iodides and chlorides bound at two of the three halogen-binding sites located at the hydrophobic channel. These sites therefore also function as halide-binding sites.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_15981995}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 15981995 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_15981995}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Sauer-Eriksson, A E.]] | | [[Category: Sauer-Eriksson, A E.]] |
| | [[Category: Transport]] | | [[Category: Transport]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:29:10 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 10:51:19 2008'' |
Revision as of 07:51, 28 July 2008
Template:STRUCTURE 1zd6
Crystal structure of human transthyretin with bound chloride
Template:ABSTRACT PUBMED 15981995
About this Structure
1ZD6 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
The effect of iodide and chloride on transthyretin structure and stability., Hornberg A, Hultdin UW, Olofsson A, Sauer-Eriksson AE, Biochemistry. 2005 Jul 5;44(26):9290-9. PMID:15981995
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