Eukaryotic small ribosomal subunit (40S)
Small ribosomal subunit of eukaryotic 80S ribosomes / From Wikipedia, the free encyclopedia
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"40S" redirects here. For the decade AD 40–49, see 40s. For the isotope of sulfur (40S), see Sulfur-40.
The eukaryotic small ribosomal subunit (40S) is the smaller subunit of the eukaryotic 80S ribosomes, with the other major component being the large ribosomal subunit (60S). The "40S" and "60S" names originate from the convention that ribosomal particles are denoted according to their sedimentation coefficients in Svedberg units. It is structurally and functionally related to the 30S subunit of 70S prokaryotic ribosomes.[1][2][3][4][5] However, the 40S subunit is much larger than the prokaryotic 30S subunit and contains many additional protein segments, as well as rRNA expansion segments.