5-Hydroxycytosine

5-Hydroxycytosine
Names
	Preferred IUPAC name 4-Amino-5-hydroxypyrimidin-2(1H)-one
	Other names 4-Amino-5-hydroxypyrimidine-2-one
Identifiers
CAS Number	13484-95-2;
3D model (JSmol)	Interactive image;
ChemSpider	2283052;
PubChem CID	3014752 tautomer;
CompTox Dashboard (EPA)	DTXSID00928775 ;
	InChI InChI=1S/C4H5N3O2/c5-3-2(8)1-6-4(9)7-3/h1,8H,(H3,5,6,7,9) COPY Key: NLLCDONDZDHLCI-UHFFFAOYSA-N;
	SMILES c1c(c([nH]c(=O)n1)N)O;
Properties
Chemical formula	C4H5N3O2
Molar mass	127.103 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

5-Hydroxycytosine is an oxidized form of cytosine that is associated with an increased frequency of C to T transition mutations, with some C to G transversions.^[1] It does not distort the DNA molecule and is readily bypassed by replicative DNA polymerases.^[2]

It has been shown in vitro to miscode for adenine.

5-hydroxycytosine is imperative for parallel DNA triplex formation, explaining why parallel triplexes form only at pH 6 and below.

References

[1]

[2]

Names

Preferred IUPAC name 4-Amino-5-hydroxypyrimidin-2(1H)-one
Other names 4-Amino-5-hydroxypyrimidine-2-one
Identifiers
CAS Number	13484-95-2
3D model (JSmol)	Interactive image
ChemSpider	2283052
PubChem CID	3014752 tautomer
CompTox Dashboard (EPA)	DTXSID00928775
InChI InChI=1S/C4H5N3O2/c5-3-2(8)1-6-4(9)7-3/h1,8H,(H3,5,6,7,9) COPY Key: NLLCDONDZDHLCI-UHFFFAOYSA-N
SMILES c1c(c([nH]c(=O)n1)N)O
Properties
Chemical formula	C₄H₅N₃O₂
Molar mass	127.103 g·mol⁻¹
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references