3'-Phosphoadenosine 5'-Phosphosulfate Synthase 1 (PAPSS1) Human Recombinant Protein

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, Mar 2008]

PAPSS1: 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. Also involved in the biosynthesis of sulfated L-selectin ligands in endothelial cells.

Protein type: Kinase, other; Other Amino Acids Metabolism - selenoamino acid; Nucleotide Metabolism - purine; EC 2.7.1.25; Energy Metabolism - sulfur; EC 2.7.7.4

Chromosomal Location of Human Ortholog: 4q24

Cellular Component: cytosol

Molecular Function: adenylylsulfate kinase activity; ATP binding; sulfate adenylyltransferase (ATP) activity; nucleotidyltransferase activity

Biological Process: sulfate assimilation; glycosaminoglycan metabolic process; xenobiotic metabolic process; carbohydrate metabolic process; pathogenesis; phosphorylation; skeletal development; 3'-phosphoadenosine 5'-phosphosulfate biosynthetic process; 3'-phosphoadenosine 5'-phosphosulfate metabolic process