9FF6 | pdb_00009ff6

Human transthyretin (TTR) in complex with (E)-4-((((2-methoxybenzyl)oxy)imino)methyl)benzoic acid (Lic157)

• PDB DOI: https://doi.org/10.2210/pdb9FF6/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-05-22 Released: 2025-06-04 
• Deposition Author(s): Ciccone, L., Shepard, W., Sirigu, S., Camodeca, C., Mazzoccchi, F., Fruchart, C., Nencetti, S., Orlandini, E.
• Funding Organization(s): Italian Ministry of Education

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 
  0.203 (Depositor), 0.212 (DCC) 
• R-Value Work: 
  0.166 (Depositor), 0.193 (DCC) 
• R-Value Observed: 
  0.167 (Depositor) 

Starting Model: experimental

Literature

New promising transthyretin stabilizers for cardiac amyloidosis treatment

Ciccone, L., Camodeca, C., Fruchart-Gaillard, C., Thai, R., Tonali, N., Basta, G., Del Turco, S., Russo, L., Noiray, M., Sirigu, S., Shepard, W., Barlettani, L., Mazzocchi, F., Orlandini, E., Nencetti, S.

(2025) Eur J Med Chem Rep 15: 100308

• DOI: https://doi.org/10.1016/j.ejmcr.2025.100308

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: mass spectrometry

Macromolecule Content 

• Total Structure Weight: 27.76 kDa 
• Atom Count: 2,336 
• Modeled Residue Count: 233 
• Deposited Residue Count: 250 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transthyretin	A, B	125	Homo sapiens	Mutation(s): 0  Gene Names: TTR, PALB
UniProt & NIH Common Fund Data Resources
Find proteins for P02766 (Homo sapiens) Explore P02766  Go to UniProtKB:  P02766
PHAROS:  P02766 GTEx:  ENSG00000118271

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
A1ICE (Subject of Investigation/LOI)	C [auth A], F [auth B]	4-[(~{Z})-(2-methoxyphenyl)methoxyiminomethyl]benzoic acid C16 H15 N O4 ODQLHMZOMGQUQG-YVLHZVERSA-N
GOL (Subject of Investigation/LOI)	D [auth B]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
EDO (Subject of Investigation/LOI)	E [auth B]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free:  0.203 (Depositor), 0.212 (DCC) 
• R-Value Work:  0.166 (Depositor), 0.193 (DCC) 
• R-Value Observed: 0.167 (Depositor) 

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.977	α = 90
b = 85.484	β = 90
c = 63.7	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
MOLREP	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-06-04 
Deposition Author(s): Ciccone, L., Shepard, W., Sirigu, S., Camodeca, C., Mazzoccchi, F., Fruchart, C., Nencetti, S., Orlandini, E.

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Funding Organization	Location	Grant Number
Italian Ministry of Education	Italy	2022KJB3B7

Revision History  

• Version 1.0: 2025-06-04
  Type: Initial release
  
• Version 1.1: 2025-12-17
  Changes: Database references