Abstract
The translation of mRNAs lacking a stop codon results in a nascent polypeptide chain still attached to the translating ribosome. When containing an exposed N-terminal targeting signal, these so-called nonstop (ns) proteins have been shown to localize to their respective organellar translocation channel, resulting in stabilized translocation intermediates. Utilizing a plasmid encoding a FLAG-tagged nonstop protein with an N-terminal targeting signal early-stage ribosome-associated protein complexes can be purified by affinity chromatography. This will be exemplified by purification of protein complexes of the peroxisomal protein import machinery using different nonstop variants of the PTS2 cargo protein Fox3p from both soluble and membrane fractions.
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