3IMR

Transthyretin in complex with (E)-2,6-dibromo-4-(2,6-dichlorostyryl)phenol

Summary for 3IMR

• Entry DOI: 10.2210/pdb3imr/pdb
• Related: 2QGB 2QGC 2QGD 2QGE 3ESN 3ESO 3IMS 3IMT 3IMU 3IMV 3IMW
• Descriptor: Transthyretin, 2,6-dibromo-4-[(E)-2-(2,6-dichlorophenyl)ethenyl]phenol (3 entities in total)
• Functional Keywords: hormone, growth factor, amyloid, disease mutation, gamma-carboxyglutamic acid, glycoprotein, polymorphism, polyneuropathy, retinol-binding, secreted, thyroid hormone, transport, vitamin a
• Biological source: Homo sapiens (human)
• Cellular location: Secreted: P02766
• Total number of polymer chains: 2
• Total formula weight: 28400.57

Authors

Connelly, S.,Wilson, I.A. (deposition date: 2009-08-11, release date: 2010-01-12, Last modification date: 2023-09-06)

Primary citation

Choi, S.,Reixach, N.,Connelly, S.,Johnson, S.M.,Wilson, I.A.,Kelly, J.W.
A substructure combination strategy to create potent and selective transthyretin kinetic stabilizers that prevent amyloidogenesis and cytotoxicity.
J.Am.Chem.Soc., 132:1359-1370, 2010

PubMed Abstract: Transthyretin aggregation-associated proteotoxicity appears to cause several human amyloid diseases. Rate-limiting tetramer dissociation and monomer misfolding of transthyretin (TTR) occur before its aggregation into cross-beta-sheet amyloid fibrils. Small molecule binding to and preferential stabilization of the tetrameric state of TTR over the dissociative transition state raises the kinetic barrier for dissociation, imposing kinetic stabilization on TTR and preventing aggregation. This is an effective strategy to halt neurodegeneration associated with polyneuropathy, according to recent placebo-controlled clinical trial results. In three recent papers, we systematically ranked possibilities for the three substructures composing a typical TTR kinetic stabilizer, using fibril inhibition potency and plasma TTR binding selectivity data. Herein, we have successfully employed a substructure combination strategy to use these data to develop potent and selective TTR kinetic stabilizers that rescue cells from the cytotoxic effects of TTR amyloidogenesis. Of the 92 stilbene and dihydrostilbene analogues synthesized, nearly all potently inhibit TTR fibril formation. Seventeen of these exhibit a binding stoichiometry of >1.5 of a maximum of 2 to plasma TTR, while displaying minimal binding to the thyroid hormone receptor (<20%). Six analogues were definitively categorized as kinetic stabilizers by evaluating dissociation time-courses. High-resolution TTR.(kinetic stabilizer)(2) crystal structures (1.31-1.70 A) confirmed the anticipated binding orientation of the 3,5-dibromo-4-hydroxyphenyl substructure and revealed a strong preference of the isosteric 3,5-dibromo-4-aminophenyl substructure to bind to the inner thyroxine binding pocket of TTR.

PubMed: 20043671
DOI: 10.1021/ja908562q

Experimental method

X-RAY DIFFRACTION (1.7 Å)