3.6.5.4 chloroplast - 9507 668340, 670542, 686752, 688395, 696602, 698898, 701227, 757189 3.6.5.4 chloroplast chloroplast SRP 9507 718911 3.6.5.4 chloroplast chloroplasts contain a signal recognition particle that lacks RNA but contains a conserved 54000 Da GTPase and a novel 43000 Da subunit 9507 669412 3.6.5.4 chloroplast the chloroplast signal recognition particle (cpSRP) is a heterodimer composed of an evolutionarily conserved 54-kDa GTPase (cpSRP54) and a unique 43-kDa subunit (cpSRP43) responsible for delivering light harvesting chlorophyll binding protein to the thylakoid membrane 9507 756198 3.6.5.4 cytoplasm - 5737 684117, 686249 3.6.5.4 cytosol cytosolic SRP 5829 718911 3.6.5.4 cytosol SRP subunit SRP54 5829 644166, 644167, 644168 3.6.5.4 cytosol the SRP targets the ribosome-nascent chain complexes to the inner membrane by interacting with the SRP receptor 5829 690025 3.6.5.4 endoplasmic reticulum - 5783 696594 3.6.5.4 endoplasmic reticulum SRP receptor alpha and beta subunits 5783 644166, 644167, 644169, 644171, 644180