4DER

Crystal Structure of the Wild Type TTR Binding Apigenin (TTRwt:API)

Summary for 4DER

• Entry DOI: 10.2210/pdb4der/pdb
• Related: 3KGS 3KGT 3KGU 3NEE 3NEO 3NES 4DES 4DET 4DEU 4DEW
• Descriptor: Transthyretin, 5,7-dihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one, GLYCEROL, ... (4 entities in total)
• Functional Keywords: beta sandwich, amyloidosis, transport protein
• Biological source: Homo sapiens (human)
• Cellular location: Secreted: P02766
• Total number of polymer chains: 2
• Total formula weight: 26039.00

Authors

Trivella, D.B.B.,Polikarpov, I. (deposition date: 2012-01-21, release date: 2012-11-21, Last modification date: 2023-09-13)

Primary citation

Trivella, D.B.,Dos Reis, C.V.,Lima, L.M.,Foguel, D.,Polikarpov, I.
Flavonoid interactions with human transthyretin: Combined structural and thermodynamic analysis.
J.Struct.Biol., 180:143-153, 2012

PubMed Abstract: Transthyretin (TTR) is a carrier protein involved in human amyloidosis. The development of small molecules that may act as TTR amyloid inhibitors is a promising strategy to treat these pathologies. Here we selected and characterized the interaction of flavonoids with the wild type and the V30M amyloidogenic mutant TTR. TTR acid aggregation was evaluated in vitro in the presence of the different flavonoids. The best TTR aggregation inhibitors were studied by Isothermal Titration Calorimetry (ITC) in order to reveal their thermodynamic signature of binding to TTRwt. Crystal structures of TTRwt in complex with the top binders were also obtained, enabling us to in depth inspect TTR interactions with these flavonoids. The results indicate that changing the number and position of hydroxyl groups attached to the flavonoid core strongly influence flavonoid recognition by TTR, either by changing ligand affinity or its mechanism of interaction with the two sites of TTR. We also compared the results obtained for TTRwt with the V30M mutant structure in the apo form, allowing us to pinpoint structural features that may facilitate or hamper ligand binding to the V30M mutant. Our data show that the TTRwt binding site is labile and, in particular, the central region of the cavity is sensible for the small differences in the ligands tested and can be influenced by the Met30 amyloidogenic mutation, therefore playing important roles in flavonoid binding affinity, mechanism and mutant protein ligand binding specificities.

PubMed: 22842046
DOI: 10.1016/j.jsb.2012.07.008

Experimental method

X-RAY DIFFRACTION (1.9 Å)