PAPSS1

Three-prime-phosphoadenosine 5-prime-phosphosulfate (PAPS) is the sulfate donor cosubstrate for all sulfotransferase (SULT) enzymes (Xu et al., 2000 [PubMed 10679223]). SULTs catalyze the sulfate conjugation of many endogenous and exogenous compounds, including drugs and other xenobiotics. In humans, PAPS is synthesized from adenosine 5-prime triphosphate (ATP) and inorganic sulfate by 2 isoforms, PAPSS1 and PAPSS2 (MIM 603005).[supplied by OMIM

Full Name

3'-phosphoadenosine 5'-phosphosulfate synthase 1

Function

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: activated sulfate donor used by sulfotransferase). In mammals, PAPS is the sole source of sulfate; APS appears to be only an intermediate in the sulfate-activation pathway (PubMed:9576487, PubMed:9668121, PubMed:9648242, PubMed:14747722).
Required for normal biosynthesis of sulfated L-selectin ligands in endothelial cells (PubMed:9576487).

Biological Process

3'-phosphoadenosine 5'-phosphosulfate biosynthetic processManual Assertion Based On ExperimentIDA:UniProtKB
Skeletal system developmentManual Assertion Based On ExperimentTAS:ProtInc
Sulfate assimilationManual Assertion Based On ExperimentIDA:UniProtKB

Cellular Location

Cytosol