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Protein targeting by the signal recognition particle (SRP) is universally conserved and starts with the recognition of a signal sequence in the context of a translating ribosome. SRP54 and FtsY, two multidomain proteins with guanosine triphosphatase (GTPase) activity, are the central elements of the SRP system. They have to coordinate the presence of a signal sequence with the presence of a vacant translocation channel in the membrane. For coordination the two GTPases form a unique, nearly symmetric heterodimeric complex in which the activation of GTP hydrolysis plays a key role for membrane insertion of substrate proteins. Recent results are integrated in an updated perception of the order of events in SRP-mediated protein targeting.