Zitosina: berrikuspenen arteko aldeak
Ezabatutako edukia Gehitutako edukia
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1. lerroa:
{{chembox
| verifiedrevid = 443557332
| ImageFile1 = Cytosine_chemical_structure.png
| ImageSize1 = 120px
| ImageFile2 = Cytosine-3D-balls.png
| ImageSize2 = 180px
| ImageFile3 = Cytosine-3D-vdW.png
| ImageSize3 = 150px
| IUPACName=4-aminopyrimidin-2(1''H'')-ona
| OtherNames=4-amino-1''H''-pirimidina-2-ona
| Section1= {{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 577
| ChEMBL_Ref = {{ebicite|correct|EBI}}
| ChEMBL = 15913
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/C4H5N3O/c5-3-1-2-6-4(8)7-3/h1-2H,(H3,5,6,7,8)
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = OPTASPLRGRRNAP-UHFFFAOYSA-N
| CASNo=71-30-7
| CASNo_Ref = {{cascite|correct|CAS}}
| PubChem=597
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 8J337D1HZY
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 16040
| SMILES = c1cnc(=O)[nH]c1N
| KEGG_Ref = {{keggcite|correct|kegg}}
| KEGG = C00380
| InChI = 1/C4H5N3O/c5-3-1-2-6-4(8)7-3/h1-2H,(H3,5,6,7,8)
| InChIKey = OPTASPLRGRRNAP-UHFFFAOYAY
| MeSHName=Cytosine
}}
|Section2 = {{Chembox Properties
| Formula=C<sub>4</sub>H<sub>5</sub>N<sub>3</sub>O
| MolarMass=111.10 g/mol
| Appearance=
| Density= 1.55 g/cm<sup>3</sup> (kalkulatua)
| MeltingPtCL = 320
| MeltingPtCH = 325
| Melting_notes = zatit.
| BoilingPt=
| pKa=4.45 (bigarren mailakoa), 12.2 (lehen mailakoa)<ref>Dawson, R.M.C., et al., ''Data for Biochemical Research'', Oxford, Clarendon Press, 1959.</ref>
| Solubility=
}}
|Section3= {{Chembox Hazards
| MainHazards=
| FlashPt=
| Autoignition=
}}
}}
'''Zitosina''' azido nukleikoetan ([[DNA]]n zein [[RNA]]n) dagoen [[base nitrogenatu]]etako bat da (besteak [[adenina]], [[guanina]], [[timina]] eta [[urazilo]] izanik). Base nitrogenatu pirimidinikoa da, pirimidinatik eratortzen baita. DNAn zitosina beti guaninarekin elkartzen da, hiru [[hidrogeno zubi]]en bitartez; lotura horrek DNAren egitura molekularra (bigarren mailako egitura) mantentzen du (eta baita adenina timinarekin egiten duen loturak ere).
Zitosinaren nukleosidoa zitidina da. Nukleosido hori fosforilatzen denean zitidin monofosfato izeneko [[nukleotido]]a sortzen da.
== Erreferentziak ==
{{erreferentzia_zerrenda}}
{{Kimika zirriborroa}}
[[Kategoria:Base nitrogenatuak]]
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