1ZD6
Crystal structure of human transthyretin with bound chloride
Summary for 1ZD6
Entry DOI | 10.2210/pdb1zd6/pdb |
Related | 1ZCR 1f41 |
Descriptor | Transthyretin, CHLORIDE ION (3 entities in total) |
Functional Keywords | transport, transport protein |
Biological source | Homo sapiens (human) |
Cellular location | Secreted: P02766 |
Total number of polymer chains | 2 |
Total formula weight | 28029.83 |
Authors | Hornberg, A.,Hultdin, U.W.,Olofsson, A.,Sauer-Eriksson, A.E. (deposition date: 2005-04-14, release date: 2005-07-12, Last modification date: 2024-03-13) |
Primary citation | Hornberg, A.,Hultdin, U.W.,Olofsson, A.,Sauer-Eriksson, A.E. The effect of iodide and chloride on transthyretin structure and stability Biochemistry, 44:9290-9299, 2005 Cited by PubMed Abstract: 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. PubMed: 15981995DOI: 10.1021/bi050249z PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (1.9 Å) |
Structure validation
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