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) (By similarity). Binds the 7SL RNA in presence of srp68 (By similarity). This ribonucleoprotein complex might interact directly with the docking protein in the ER membrane and possibly participates in the elongation arrest function (By similarity). Component of a signal recognition particle (SRP) complex that consists of a 7SL RNA molecule and six protein subunits: srp72, srp68, srp54, srp19, srp14 and srp9. The C-terminus is essential for the interaction with the srp68/7SL RNA complex. Belongs to the SRP72 family.