Document Detail

para-Nitrophenyl sulfate activation of human sulfotransferase 1A1 is consistent with intercepting the E[middle dot]PAP complex and reformation of E[middle dot]PAPS.
MedLine Citation:
PMID:  19706609     Owner:  NLM     Status:  MEDLINE    
Cytosolic sulfotransferase (SULT)-catalyzed sulfation regulates biological activities of various biosignaling molecules and metabolizes hydroxyl-containing drugs and xenobiotics. The universal sulfuryl group donor for SULT-catalyzed sulfation is adenosine 3'-phosphate 5'-phosphosulfate (PAPS), whereas the reaction products are a sulfated product and adenosine 3',5'-diphosphate (PAP). Although SULT-catalyzed kinetic mechanisms have been studied since the 1980s, they remain unclear. Human SULT1A1 is an important phase II drug-metabolizing enzyme. Previously, isotope exchange at equilibrium indicated steady-state ordered mechanism with PAPS and PAP binding to the free SULT1A1 (Tyapochkin, E., Cook, P. F., and Chen, G. (2008) Biochemistry 47, 11894-11899). On the basis of activation of SULT1A1 by para-nitrophenyl sulfate (pNPS), an ordered bypass mechanism has been proposed where pNPS sulfates PAP prior to its release from the E.PAP complex regenerating E.PAPS. Data are consistent with uncompetitive substrate inhibition by naphthol as a result of formation of the E.PAP.naphthol dead-end complex; formation of the complex is corroborated by naphthol/PAP double inhibition experiments. pNPS activation data demonstrate an apparent ping-pong behavior with pNPS adding to E.PAP, and competitive inhibition by naphthol consistent with formation of the E.PAP.naphthol complex. Exchange against forward reaction flux (PAPS plus naphthol) beginning with [35S]PAPS and generating [35S]naphthyl sulfate is also consistent with pNPS intercepting the E.PAP complex. Overall, data are consistent with the proposed ordered bypass mechanism.
Eduard Tyapochkin; Paul F Cook; Guangping Chen
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2009-08-25
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  284     ISSN:  1083-351X     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-19     Completed Date:  2009-11-23     Revised Date:  2013-05-31    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  29357-64     Citation Subset:  IM    
Department of Physiological Sciences, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
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MeSH Terms
Adenosine Diphosphate / chemistry*
Arylsulfotransferase / chemistry*
Enzyme Activation
Models, Chemical*
Nitrobenzenes / chemistry*
Phosphoadenosine Phosphosulfate / chemistry*
Grant Support
Reg. No./Substance:
0/Nitrobenzenes; 1053-73-2/adenosine 3'-phosphate-5'-phosphate; 1080-04-2/4-nitrophenyl sulfate; 482-67-7/Phosphoadenosine Phosphosulfate; 58-64-0/Adenosine Diphosphate; EC; EC protein, human

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