Adenosine-5 -phosphosulfate structure

In Renilla the coelenterazine is stored as a coelenterazine sulfate, possibly having the structure shown. To convert this storage form to the active luciferin the sulfo group is transferred onto adenosine 3, 5 -bisphosphate to form 3 -phosphoadenosine 5 -phosphosulfate, the reverse of step d of Eq. 17-38. Tire luciferin of the ostracod crustacean Vargula hilgendorfii has a structure (Fig. 23-51) close to that from Renilla. 

Figure 2. Structure of the adenosine-5 -phosphosulfate (APS) molecule (Reproduced with permission from Ref. 9. Copyright 1986 U. Fischer).

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