Uridine

Uridine is a pyrimidine nucleoside consisting of uracil linked to ribose. It occurs in RNA and serves as a precursor in nucleotide metabolism.

Uracil: Uracil is a pyrimidine nucleobase found in RNA, where it pairs with adenine. Uracil is the base joined to ribose to form uridine.
Uridine kinase: Uridine kinase is an enzyme that phosphorylates uridine to form uridine monophosphate. It provides a salvage route from free uridine to a nucleotide.
RNA: RNA is a polymer of ribonucleotides that carries, regulates, or helps express genetic information. Uridine residues appear in RNA as uracil linked to ribose.
Cytidine: Cytidine is a ribonucleoside composed of cytosine linked to ribose. It shares uridine's ribose but has a different pyrimidine base.
Ribose: Ribose is a five-carbon sugar present in RNA and several cellular molecules. Ribose supplies the sugar portion of uridine.
Uridine monophosphate: Uridine monophosphate is a nucleotide consisting of uracil, ribose, and one phosphate group. It is the first phosphorylated product formed from uridine in salvage.
RNA polymerase: RNA polymerases synthesize RNA by joining ribonucleoside triphosphates according to a DNA or RNA template. The enzyme incorporates uridine triphosphate when the template specifies uracil.
Thymidine: Thymidine is a nucleoside composed of thymine linked to a sugar, commonly deoxyribose in DNA. Its thymine base distinguishes it from uridine's uracil.
Nucleoside: A nucleoside consists of a nitrogenous base bonded to a sugar, without phosphate. Uridine belongs to this molecular class because it has a base and sugar but no phosphate.
Uridine diphosphate: Uridine diphosphate is a nucleotide with two phosphate groups attached to uridine. It is a downstream phosphorylated form in uridine nucleotide metabolism.

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