Respuesta :
For the remainder of translation, proteins lacking a signal peptide remain in the cytosol. They will remain in the cytosol for all time if no additional "address labels" are present. However, following translation, they can be sent to the mitochondria, chloroplasts, peroxisomes, or nucleus provided they carry the appropriate labels.
Proteins are directed into the nucleus, mitochondria, chloroplasts (in plants), peroxisomes, and ER by several sorting signals. Proteins devoid of these signals stay in the cytosol permanently. Proteins produced in the cytosol that lack a signal sequence stay there. A transmembrane signal peptidase always eliminates the signal sequence that instructs a developing polypeptide chain to reach the ER membrane. Signals found in the cytosolic domains of the proteins are what sort transmembrane proteins to endosomes and lysosomes. Short, linear sequences of amino acid residues make up the majority of signals.
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