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Any constituent part of the cytoplasm, all of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures. Either of the two ribonucleoprotein complexes that associate to form a ribosome. The small subunit of the ribosome that is found in the cytosol of the cell. The cytosol is that part of the cytoplasm that does not contain membranous or particulate subcellular components. Examples of this component are found in Mus musculus, and in Bacterial and Archaeal species. A macromolecular complex containing both protein and RNA molecules. The smaller of the two subunits of an organellar ribosome. A constituent part of an intracellular organelle, an organized structure of distinctive morphology and function, occurring within the cell. Includes constituent parts of the nucleus, mitochondria, plastids, vacuoles, vesicles, ribosomes and the cytoskeleton but excludes the plasma membrane. The smaller of the two subunits of a ribosome. An intracellular organelle, about 200 A in diameter, consisting of RNA and protein. It is the site of protein biosynthesis resulting from translation of messenger RNA (mRNA). It consists of two subunits, one large and one small, each containing only protein and RNA. Both the ribosome and its subunits are characterized by their sedimentation coefficients, expressed in Svedberg units (symbol: S). Hence, the prokaryotic ribosome (70S) comprises a large (50S) subunit and a small (30S) subunit, while the eukaryotic ribosome (80S) comprises a large (60S) subunit and a small (40S) subunit. Two sites on the ribosomal large subunit are involved in translation, namely the aminoacyl site (A site) and peptidyl site (P site). Ribosomes from prokaryotes, eukaryotes, mitochondria, and chloroplasts have characteristically distinct ribosomal proteins.

View Gene Ontology (GO) Term


Name: small ribosomal subunit
Acc: GO:0015935
Aspect: Cellular Component
Desc: The smaller of the two subunits of a ribosome.
  • ribosomal small subunit
Proteins in PDR annotated with:
   This term: 184 [Search]
   Term or descendants: 609 [Search]


GO:0015935 - small ribosomal subunit (interactive image map)

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