Respuesta :
As they emerge from the ribosome, signal sequences are recognized and bound by a signal recognition particle (SRP).
The majority of newly synthesized proteins that are destined for the secretory pathway contain a short peptide known as a signal sequence at their N-terminus. These proteins include those that are inserted into most cellular membranes, secreted from the cell, or found within specific organelles.
The mechanism by which secretory proteins are targeted to the ER during their translation (the cotranslational pathway) is as follows. A signal recognition particle (SRP) composed of six polypeptides and a small cytoplasmic RNA (7SL RNA) recognizes and binds signal sequences as they emerge from the ribosome. The signal sequences are about 20 amino acids long and typically contain hydrophobic residues near the polypeptide chain's amino terminus.
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