Cytidine

Cytidine is a pyrimidine nucleoside in which cytosine is attached to ribose. It occurs in RNA and is a precursor to several nucleotide forms.

Ribose: Ribose is a five-carbon sugar found in RNA and several biologically important molecules. Ribose supplies the sugar portion of cytidine.
RNA: RNA is a nucleic acid usually composed of ribose-based nucleotides and involved in gene expression and other cellular functions. Cytidine residues pair with guanosine residues in RNA and contribute to RNA structure.
RNA polymerase: RNA polymerase is an enzyme that synthesizes RNA from a DNA or RNA template. RNA polymerases incorporate cytidine triphosphate when the template calls for guanine.
Uridine: Uridine is an RNA nucleoside made of uracil attached to ribose. Replacing cytosine with uracil gives the closely related nucleoside uridine.
Genetic code: The genetic code maps nucleotide triplets in messenger RNA to amino acids and translation signals. Cytidine can occupy codon positions and thereby contribute to specifying proteins.
Nucleoside: A nucleoside consists of a nitrogenous base joined to a sugar. Cytidine belongs to this class because it has a base and sugar but no phosphate.
Watson–Crick base pairing: Watson–Crick base pairing is the complementary hydrogen-bonding pattern between adenine and thymine or uracil, and between guanine and cytosine. Cytidine’s cytosine base pairs with guanine in RNA.
Pyrimidine metabolism: Pyrimidine metabolism comprises the synthesis, transformation, and breakdown of pyrimidine nucleotides and bases. Cells make and recycle cytidine through interconnected pyrimidine pathways.
Deoxycytidine: Deoxycytidine is a nucleoside made of cytosine attached to 2-deoxyribose. Its sugar lacks ribose’s 2′ hydroxyl group, distinguishing it from cytidine.
RNA structure: RNA structure is the three-dimensional arrangement formed by base pairing and other interactions within RNA molecules. Cytidine’s pairing with guanine helps shape RNA folding and molecular recognition.

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ThymidineRelated: It is another pyrimidine nucleoside, with a different base and sugar.