Also found in: Medical.
signal-recognition particle[¦sig·nəl rek·ig′nish·ən ‚pärd·i·kəl]
(cell and molecular biology)
A ribonucleoprotein consisting of a ribonucleic acid (RNA) molecule and six distinct peptide chains that recognizes the signal sequence of a partially synthesized protein and guides it along with its ribosome to a signal recognition particle receptor in the endoplasmic reticulum. Abbreviated SRP.