1tt6
From Proteopedia
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The orthorhombic crystal structure of transthyretin in complex with diethylstilbestrol
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Overview
Transthyretin (TTR) is a homotetrameric plasma protein that, in conditions, not yet completely understood, may aggregate, forming the fibrillar, material associated with TTR amyloidosis. A number of reported experiments, indicate that dissociation of the TTR tetramer occurs prior to fibril, formation, and therefore, studies aiming at the discovery of compounds, that stabilize the protein quaternary structure, thereby acting as amyloid, inhibitors, are being performed. The ability of diethylstilbestrol (DES), to act as a competitive inhibitor for the thyroid hormone binding to TTR, indicated a possible stabilizing effect of DES upon binding. Here we, report the crystallographic study of DES binding to TTR. The structural, data reveal two different binding modes, both located in the thyroxine, binding channel. In both cases, DES binds deeply in the channel and, establishes interactions with the equivalent molecule present in the, adjacent binding site. The most remarkable features of DES interaction, with TTR are its hydrophobic interactions within the protein halogen, binding pockets, where its ethyl groups are snugly fitted, and the, hydrogen bonds established at the center of the tetramer with Ser-117., Experiments concerning amyloid formation in vitro suggest that DES is, effectively an amyloid inhibitor in acid-mediated fibrillogenesis and may, be used for the design of more powerful drugs. The present study gave us, further insight in the molecular mechanism by which DES competes with, thyroid hormone binding to TTR and highlights key interactions between DES, and TTR that oppose amyloid formation.
Disease
Known diseases associated with this structure: Amyloid neuropathy, familial, several allelic types OMIM:[176300], Amyloidosis, senile systemic OMIM:[176300], Carpal tunnel syndrome, familial OMIM:[176300], Dystransthyretinemic hyperthyroxinemia OMIM:[176300]
About this Structure
1TT6 is a Single protein structure of sequence from Homo sapiens with SO4, DES and GOL as ligands. Full crystallographic information is available from OCA.
Reference
The crystal structure of transthyretin in complex with diethylstilbestrol: a promising template for the design of amyloid inhibitors., Morais-de-Sa E, Pereira PJ, Saraiva MJ, Damas AM, J Biol Chem. 2004 Dec 17;279(51):53483-90. Epub 2004 Oct 6. PMID:15469931
Page seeded by OCA on Mon Nov 12 19:27:38 2007
