1Z7J

Human transthyretin (also called prealbumin) complex with 3, 3',5,5'-tetraiodothyroacetic acid (t4ac)

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1Z7J の概要

• エントリーDOI: 10.2210/pdb1z7j/pdb
• 関連するPDBエントリー: 1PAB 2ROX
• 分子名称: Transthyretin, 3,3',5,5'-TETRAIODOTHYROACETIC ACID (3 entities in total)
• 機能のキーワード: albumin, transport, retinol-binding, vitamin a, amyloid, thyroid hormone, liver, plasma, cerebrospinal fluid, polyneuropathy, disease mutation, tetraiodothyroacetic acid, t4ac, prealbumin, transport protein
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Secreted: P02766
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 29050.38

構造登録者

Neumann, P.,Wojtczak, A.,Cody, V. (登録日: 2005-03-25, 公開日: 2005-06-07, 最終更新日: 2023-08-23)

主引用文献

Neumann, P.,Cody, V.,Wojtczak, A.
Ligand binding at the transthyretin dimer-dimer interface: structure of the transthyretin-T4Ac complex at 2.2 Angstrom resolution.
Acta Crystallogr.,Sect.D, 61:1313-1319, 2005

PubMed Abstract: The crystal structure of the complex of human transthyretin (hTTR) with 3,3',5,5'-tetraiodothyroacetic acid (T4Ac) has been determined to 2.2 Angstrom resolution. The complex crystallizes in the orthorhombic space group P2(1)2(1)2, with unit-cell parameters a = 43.46, b = 85.85, c = 65.44 Angstrom. The structure was refined to R = 17.3% and R(free) = 21.9% for reflections without any sigma-cutoff. T4Ac is bound in both the forward and the reverse mode in the two binding sites of hTTR. In the forward orientation, T4Ac binds in a position similar to that described for thyroxine (T4) in the orthorhombic hTTR-T4 complex. In this orientation, the iodine substituents of the phenolic ring are bound in the P3'/P2 halogen pockets. In the reverse orientation, which is the major binding mode of T4Ac, the ligand is bound deep in the TTR channel, with the carboxylic group bound in the P3' pocket and forming simultaneous polar interactions with the residues constituting the two hormone-binding sites. Such interactions of a thyroxine-analogue ligand bound in the reverse mode have never been observed in TTR complexes previously.

PubMed: 16204882
DOI: 10.1107/S0907444905022523

実験手法

X-RAY DIFFRACTION (2.2 Å)