Cytosine

C₄H₅N₃O

IUPAC: 4-Aminopyrimidin-2(1H)-one

CAS: 71-30-7

概述

Cytosine is a pyrimidine nucleobase that pairs with guanine in both DNA and RNA through three hydrogen bonds. In DNA, cytosine can be methylated (5-methylcytosine), which plays a key role in epigenetic gene regulation without changing the DNA sequence.

组成

元素 符号 原子 原子质量
Hydrogen H 5 1.0080
Carbon C 4 12.0110
Nitrogen N 3 14.0070
Oxygen O 1 15.9990

元素组成

H
Hydrogen ×5
4.5%
C
Carbon ×4
43.2%
N
Nitrogen ×3
37.8%
O
Oxygen ×1
14.4%

用途

  • • DNA/RNA base pair component
  • • Epigenetics research (methylation)
  • • Molecular biology
  • • Genetic analysis

趣味知识

  • ✦ Cytosine methylation is a key mechanism of epigenetics, allowing gene expression changes without DNA sequence changes

安全性

  • ⚠ Low toxicity

Structure

SMILES

C1=C(NC(=O)N=C1)N

属性

类型
organic
状态
solid
摩尔质量
111.10 g/mol
密度
1.5500 g/cm³
熔点
320.0 °C
溶解度
7.69 g/L at 25°C

Molecular Descriptors

Exact Mass
111.0433
XLogP
-1.7
TPSA
67.5 Ų
H-Bond Donors
2
H-Bond Acceptors
2
Rotatable Bonds
0
Heavy Atoms
8
Complexity
170.0

别名

Cytosine

相关化合物

Caffeine

C₈H₁₀N₄O₂

Coumarin

C₉H₆O₂

Acetone

(CH₃)₂CO

Acrylic Acid

C₃H₄O₂

Cysteine

C₃H₇NO₂S

DDT

C₁₄H₉Cl₅

Alanine

C₃H₇NO₂

Diazepam

C₁₆H₁₃ClN₂O

Dichloromethane

CH₂Cl₂

Butane

C₄H₁₀

Frequently Asked Questions

What is Cytosine?
Cytosine (C₄H₅N₃O) is a organic compound with the IUPAC name 4-Aminopyrimidin-2(1H)-one.
What is the molecular weight of Cytosine?
Cytosine has a molar mass of 111.102 g/mol.
What state is Cytosine at room temperature?
Cytosine is a solid at room temperature.
Is Cytosine organic or inorganic?
Cytosine is classified as an organic compound.
What elements make up Cytosine?
Cytosine (C₄H₅N₃O) is composed of Hydrogen (H), Carbon (C), Nitrogen (N), Oxygen (O).