Modomics - A Database of RNA Modifications

The molecule is shown in a ball-and-stick representation with the following colors for atoms :
Hydrogen (H): white Carbon (C): gray Oxygen (O): red Phosphorus (P): orange Nitrogen (N): blue Selenium (Se): gold Sulfur (S): yellow


Full nameN6-formyladenosine
IUPAC nameN-[9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]purin-6-yl]formamide
Short namef6A
MODOMICS code new2000000067A
Nature of the modified residueNatural
RNAMods codeϨ
Residue unique ID177
Found in RNAYes
Related nucleotides434
Enzymes FTO (Homo sapiens)
Found in phylogenyEukaryota
Found naturally in RNA typesmRNA

Chemical information

Sum formulaC11H13N5O5
Type of moietynucleoside
Degeneracynot applicable
Number of atoms21
Number of Hydrogen Bond Acceptors 1 (HBA1)9
Number of Hydrogen Bond Acceptors 2 (HBA2)10
Number of Hydrogen Bond Donors (HBD)4
PDB no exac match , link to the most similar ligand 26A
HMDB (Human Metabolome Database) no exact match, link to the most similar ligand None
Search the molecule in external databases ChEMBL  ChemAgora  ChEBI  PubChem Compound Database  Ligand Expo  ChemSpider  WIPO 
PubChem CID
PubChem SIDs

* Chemical properties calculated with Open Babel - O'Boyle et al. Open Babel: An open chemical toolbox. J Cheminform 3, 33 (2011) (link)

Download Structures

2D   .png .mol .mol2 .sdf .pdb .smi
3D   .mol .mol2 .sdf .pdb


Tautomers SMILES
OCC1OC(n2cnc3c(NC=O)ncnc23)C(O)C1O tautomer #0
OCC1OC(n2cnc3c(NC=O)ncnc23)C(O)C1O tautomer #1
OCC1OC(n2cnc3c(=NC=O)nc[nH]c23)C(O)C1O tautomer #2
OCC1OC(n2cnc3c(=NC=O)[nH]cnc23)C(O)C1O tautomer #3
OCC1OC(n2cnc3c(N=CO)ncnc23)C(O)C1O tautomer #4
OCC1OC(N2C=NC3C(=NC=O)N=CN=C23)C(O)C1O tautomer #5
Tautomer image Show Image

Predicted CYP Metabolic Sites

f6A f6A f6A

* CYP Metabolic sites predicted with SMARTCyp. SMARTCyp is a method for prediction of which sites in a molecule that are most liable to metabolism by Cytochrome P450. It has been shown to be applicable to metabolism by the isoforms 1A2, 2A6, 2B6, 2C8, 2C19, 2E1, and 3A4 (CYP3A4), and specific models for the isoform 2C9 (CYP2C9) and isoform 2D6 (CYP2D6). CYP3A4, CYP2D6, and CYP2C9 are the three of the most important enzymes in drug metabolism since they are involved in the metabolism of more than half of the drugs used today. The three top-ranked atoms are highlighted. See: SmartCYP and SmartCYP - background; Patrik Rydberg, David E. Gloriam, Lars Olsen, The SMARTCyp cytochrome P450 metabolism prediction server, Bioinformatics, Volume 26, Issue 23, 1 December 2010, Pages 2988–2989 (link)

LC-MS Information

Monoisotopic mass295.0917
Average mass295.251
Product ions164
Normalized LC elution time * not available
LC elution order/characteristics not available

* normalized to guanosine (G), measured with a RP C-18 column with acetonitrile/ammonium acetate as mobile phase.

Reactions producing N6-formyladenosine



Title Authors Journal Details PubMed Id DOI
FTO-mediated formation of N(6)-hydroxymethyladenosine and N(6)-formyladenosine in mammalian RNA. Fu Y, Jia G, Pang X, Wang RN, Wang X, Li CJ, Smemo S, Dai Q, Bailey KA, Nobrega MA, Han KL, Cui Q, He C... Nat Commun [details] 23653210 -

Last modification of this entry: Sept. 22, 2023