Component of the signal recognition particle (SRP) complex, a ribonucleoprotein complex that mediates the cotranslational targeting of secretory and membrane proteins to the endoplasmic reticulum (ER) (PubMed:6938958, PubMed:6413076). Binds directly to 7SL RNA (PubMed:6413076). Mediates binding of SRP54 to the SRP complex (PubMed:6413076). Component of a signal recognition particle complex that consists of a 7SL RNA molecule of 300 nucleotides and six protein subunits: SRP72, SRP68, SRP54, SRP19, SRP14 and SRP9. Interacts with IPO5, IPO7, IPO8, KPNB1 and TNPO1. Interactions with IPO8 and TNPO1 may be involved in SRP19 import into the nucleus (By similarity). Although the signal recognition particle complex acts in the cytoplasm, it assembles at least in part in the nucleus and/or the nucleolus. SRP19 nuclear import may be mediated by IPO8/Imp8 and TPNO1/Trn. Belongs to the SRP19 family.