When adrenaline (epinephrine) binds to its integral membrane receptor, this initiates an intracellular signalling cascade, which includes each of the following events (but not necessarily in this order):

1. The Gα subunit binds to adenylyl cyclase
2. GDP dissociates from the Gα subunit
3. The Gα subunit dissociates from the receptor and the Gβ/Gγ subunits
4. The adrenergic receptor undergoes a conformational change
5. ATP is converted to cAMP and pyrophosphate (PPi)
6. GTP (bound to the Gα subunit) is hydrolysed to give GDP

What is the correct order of these events?