Biology / Bio 1289 · Atom · ~20 seconds
Translation Initiation
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Translation initiation assembles the small ribosomal subunit, an initiator tRNA carrying methionine, and the mRNA's start codon, before the large subunit joins.
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In eukaryotes, the small subunit scans the mRNA from its 5' end until the initiator tRNA pairs with the AUG start codon.
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Initiation ends once both subunits assemble at the start codon — no amino acid bond has yet formed.