Binds to the signal sequence of presecretory protein when they emerge from the ribosomes and transfers them to TRAM (translocating chain-associating membrane protein). Fungal signal recognition particle consists of a 7S RNA molecule (SCR1) and at least seven protein subunits: SRP72, SRP68, SRP54, SEC65, SRP21, SRP14 and SRP7. Has a two domain structure: the G-domain binds GTP; the M-domain binds the 7S RNA in presence of SRP19 and also binds the signal sequence. Belongs to the GTP-binding SRP family. SRP54 subfamily.