Bifunctional enzyme with both ATP sulfurylase and APS kinase activity, which mediates two steps in the sulfate activation pathway. The first step is the transfer of a sulfate group to ATP to yield adenosine 5'-phosphosulfate (APS), and the second step is the transfer of a phosphate group from ATP to APS yielding 3'-phosphoadenylylsulfate/PAPS, the activated sulfate donor used by sulfotransferases . In mammals, PAPS is the sole source of sulfate while APS appears to only be an intermediate in the sulfate-activation pathway . Plays indirectly an important role in skeletogenesis during postnatal growth .
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Expressed in cartilage and adrenal gland.
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