Small subunit

One of the subunits on the ribosome that provide the mRNA binding site

Ribosome small subunit yes ribosome Smaller Ribosomal subunit 。 Each ribosome consists of a small ribosome subunit and a Ribosome large subunit Together. Small subunits are responsible for information recognition during ribosome translation.

The small subunit is ribosome One of the subunits that provide the mRNA binding site on the Large subunit They form ribosomes together.

Chinese name: Small subunit
Foreign name: Ribosomal Small Subunit

Abbreviation: “SSU”
Interpretation: ribosome Smaller Ribosomal subunit

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two Structure and function

nature

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Prokaryotic cell In 70S ribosome 、 Eukaryotic cell 80S ribosomes in cytoplasm and 80S ribosomes in mitochondria of eukaryotic cells Mitochondrial ribosome Each has a different Ribosome small subunit : 70S ribosome contains 30S ribosome subunit, 80S ribosome contains 40S ribosome subunit, and mitochondrial ribosome contains 28S ribosome subunit.

Structure and function

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The upstream of one rRNA3 'end of the small ribosomal subunit has a nucleotide sequence that can be complementary to the mRNA5' end through hydrogen bonding. This sequence on the prokaryotic 16S rRNA is called the "anti Schein Dargano sequence", and the sequence with the same function on the eukaryotic ribosome small subunit 18S rRNA is called the "anti Kozak shared sequence".

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