Canadian Medical Guide > Chemicals and Drugs > Nucleic Acids, Nucleotides, and Nucleosides > Nucleic Acids > RNA > RNA, Ribosomal Terms and Definitions

RNA, Ribosomal

Medical Definition:	The most abundant form of RNA. Together with proteins, it forms the ribosomes, playing a structural role and also a role in ribosomal binding of mRNA and tRNAs. Individual chains are conventionally designated by their sedimentation coefficients. In eukaryotes, four large chains exist, synthesized in the nucleolus and constituting about 50% of the ribosome. (Dorland, 28th ed)
Guide Notes:	IM; /drug eff /ultrastruct permitted; RRNA OPERON is also available
Also Called:	15S RNA
Previously Indexed:	RNA (1966-1970),Ribosomes (1966-1970)

RNA, Ribosomal Categories.

	RNA, Ribosomal, 16S - Constituent of 30S subunit prokaryotic ribosomes containing 1600 nucleotides and 21 proteins. 16S rRNA is involved in initiation of polypeptide synthesis.
	RNA, Ribosomal, 18S - Constituent of the 40S subunit of eukaryotic ribosomes. 18S rRNA is involved in the initiation of polypeptide synthesis in eukaryotes.
	RNA, Ribosomal, 23S - Constituent of 50S subunit of prokaryotic ribosomes containing about 3200 nucleotides. 23S rRNA is involved in the initiation of polypeptide synthesis.
	RNA, Ribosomal, 28S - Constituent of the 60S subunit of eukaryotic ribosomes. 28S rRNA is involved in the initiation of polypeptide synthesis in eukaryotes.
	RNA, Ribosomal, 5.8S - Constituent of the 60S subunit of eukaryotic ribosomes. 5.8S rRNA is involved in the initiation of polypeptide synthesis in eukaryotes.
	RNA, Ribosomal, 5S - Constituent of the 50S subunit of prokaryotic ribosomes containing about 120 nucleotides and 34 proteins. It is also a constituent of the 60S subunit of eukaryotic ribosomes. 5S rRNA is involved in initiation of polypeptide synthesis.

RNA, Ribosomal Medical Definitions and Terms

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