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:7925282). The SRP complex interacts with the signal sequence in nascent secretory and membrane proteins and directs them to the membrane of the ER (By similarity). The SRP complex targets the ribosome-nascent chain complex to the SRP receptor (SR), which is anchored in the ER, where SR compaction and GTPase rearrangement drive cotranslational protein translocation into the ER (By similarity). Binds the signal recognition particle RNA (7SL RNA), SRP72 binds to this complex subsequently (By similarity). The SRP complex possibly participates in the elongation arrest function (PubMed:7925282). Heterodimer with SRP72 (By similarity). SRP68-SRP72 heterodimer formation is stabilized by the presence of 7SL RNA (By similarity). Component of a fungal signal recognition particle (SRP) complex that consists of a 7SL RNA molecule (scR1) and at least six protein subunits: SRP72, SRP68, SRP54, SEC65, SRP21 and SRP14 (PubMed:7925282, PubMed:11352936). Present with 6280 molecules/cell in log phase SD medium. Belongs to the SRP68 family.