9OHS | pdb_00009ohs

Crystal structure of human FTO in complex with Ga(III) and ascorbate

• PDB DOI: https://doi.org/10.2210/pdb9OHS/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2025-05-05 Released: 2025-07-02 
• Deposition Author(s): Calzini, L.O., Mugridge, J.S.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.07 Å
• R-Value Free: 
  0.253 (Depositor), 0.258 (DCC) 
• R-Value Work: 
  0.193 (Depositor), 0.198 (DCC) 
• R-Value Observed: 
  0.199 (Depositor) 

Starting Model: experimental

Literature

Differential control of RNA demethylase activity and selectivity by cofactor ascorbate

Calzini, L.O., Warminski, M., Kowalska, J., Jemielity, J., Mugridge, J.S.

(2025) bioRxiv 

• DOI: https://doi.org/10.1101/2025.05.06.652568

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 55.14 kDa 
• Atom Count: 3,488 
• Modeled Residue Count: 427 
• Deposited Residue Count: 479 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Alpha-ketoglutarate-dependent dioxygenase FTO	A	479	Homo sapiens	Mutation(s): 0  Gene Names: FTO, KIAA1752 EC: 1.14.11 (PDB Primary Data), 1.14.11.53 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q9C0B1 (Homo sapiens) Explore Q9C0B1  Go to UniProtKB:  Q9C0B1
PHAROS:  Q9C0B1 GTEx:  ENSG00000140718

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ASC (Subject of Investigation/LOI)	C [auth A]	ASCORBIC ACID C6 H8 O6 CIWBSHSKHKDKBQ-JLAZNSOCSA-N
GA	B [auth A]	GALLIUM (III) ION Ga CKHJYUSOUQDYEN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.07 Å
• R-Value Free:  0.253 (Depositor), 0.258 (DCC) 
• R-Value Work:  0.193 (Depositor), 0.198 (DCC) 
• R-Value Observed: 0.199 (Depositor) 

Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 143.872	α = 90
b = 143.872	β = 90
c = 85.241	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
PHASER	phasing
Coot	model building
XDS	data scaling

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-07-02 
Deposition Author(s): Calzini, L.O., Mugridge, J.S.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R35GM143000

Revision History  

• Version 1.0: 2025-07-02
  Type: Initial release