Abstract Title:

The crystal structure of the green tea polyphenol (-)-epigallocatechin gallate-transthyretin complex reveals a novel binding site distinct from the thyroxine binding site.

Abstract Source:

Biochemistry. 2010 Jul 27;49(29):6104-14. PMID: 20565072

Abstract Author(s):

Masanori Miyata, Takashi Sato, Miyuki Kugimiya, Misato Sho, Teruya Nakamura, Shinji Ikemizu, Mami Chirifu, Mineyuki Mizuguchi, Yuko Nabeshima, Yoshiaki Suwa, Hiroshi Morioka, Takao Arimori, Mary Ann Suico, Tsuyoshi Shuto, Yasuhiro Sako, Mamiko Momohara, Tomoaki Koga, Saori Morino-Koga, Yuriko Yamagata, Hirofumi Kai

Article Affiliation:

Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Kumamoto 862-0973, Japan.

Abstract:

Amyloid fibril formation is associated with protein misfolding disorders, including neurodegenerative diseases such as Alzheimer's, Parkinson's, and Huntington's diseases. Familial amyloid polyneuropathy (FAP) is a hereditary disease caused by a point mutation of the human plasma protein, transthyretin (TTR), which binds and transports thyroxine (T(4)). TTR variants contribute to the pathogenesis of amyloidosis by forming amyloid fibrils in the extracellular environment. A recent report showed that epigallocatechin 3-gallate (EGCG), the major polyphenol component of green tea, binds to TTR and suppresses TTR amyloid fibril formation. However, structural analysis of EGCG binding to TTR has not yet been conducted. Here we first investigated the crystal structure of the EGCG-V30M TTR complex and found novel binding sites distinct from the thyroxine binding site, suggesting that EGCG has a mode of action different from those of previous chemical compounds that were shown to bind and stabilize the TTR tetramer structure. Furthermore, EGCG induced the oligomerization and monomer suppression in the cellular system of clinically reported TTR variants. Taken together, these findings suggest the possibility that EGCG may be a candidate compound for FAP therapy.

Study Type : Review

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