9H7L | pdb_00009h7l

Human Transthyretin in Complex with 4-phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine

• PDB DOI: https://doi.org/10.2210/pdb9H7L/pdb

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


• Deposited: 2024-10-27 Released: 2025-03-12 
• Deposition Author(s): Chen, W.
• Funding Organization(s): University of College London, Other private

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.18 Å
• R-Value Free: 
  0.192 (Depositor), 0.193 (DCC) 
• R-Value Work: 
  0.172 (Depositor), 0.175 (DCC) 
• R-Value Observed: 
  0.173 (Depositor) 

Starting Model: experimental

Literature

Fragment-Based Drug Discovery for Transthyretin Kinetic Stabilisers Using a Novel Capillary Zone Electrophoresis Method

Chen, W.

(2025) bioRxiv 

• DOI: https://doi.org/10.1101/2025.02.22.639275

Biological Assembly 1  

Global Symmetry: Dihedral - D2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 28.06 kDa 
• Atom Count: 1,794 
• Modelled Residue Count: 223 
• Deposited Residue Count: 254 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transthyretin	A, B	127	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 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
A1IS0 (Subject of Investigation/LOI)	D [auth A], F [auth B]	4-phenyl-2H-pyrazolo[3,4-b]pyridin-3-amine C12 H10 N4 GFHKPJCWBZMRSN-UHFFFAOYSA-N
CA	C [auth A], E [auth B]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.18 Å
• R-Value Free:  0.192 (Depositor), 0.193 (DCC) 
• R-Value Work:  0.172 (Depositor), 0.175 (DCC) 
• R-Value Observed: 0.173 (Depositor) 

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.503	α = 90
b = 84.336	β = 90
c = 65.742	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
pointless	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-03-12 
Deposition Author(s): Chen, W.

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Funding Organization	Location	Grant Number
University of College London	United Kingdom	BXTX
Other private		HN9A

Revision History  

• Version 1.0: 2025-03-12
  Type: Initial release