2a3r
From Proteopedia
Crystal Structure of Human Sulfotransferase SULT1A3 in Complex with Dopamine and 3-Phosphoadenosine 5-Phosphate
Overview
The human sulfotransferase, SULT1A3, catalyzes specifically the sulfonation of monoamines such as dopamine, epinephrine, and norepinephrine. SULT1A3 also has a unique 3,4-dihydroxyphenylalanine (Dopa)/tyrosine-sulfating activity that is preferentially toward their D-form enantiomers and can be stimulated dramatically by Mn2+. To further our understanding of the molecular basis for the unique substrate specificity of this enzyme, we solved the crystal structure of human SULT1A3, complexed with dopamine and 3'-phosphoadenosine 5'-phosphate, at 2.6 A resolution and carried out autodocking analysis with D-Dopa. The structure of SULT1A3 enzyme-ligand complex clearly showed that residue Glu146 can form electrostatic interaction with dopamine and may play a pivotal role in the stereoselectivity and sulfating activity. On the other hand, residue Asp86 appeared to be critical to the Mn2+-stimulation of the Dopa/tyrosine-sulfating activity of SULT1A3, in addition to a supporting role in the stereoselectivity and sulfating activity.
About this Structure
2A3R is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structure of human sulfotransferase SULT1A3 in complex with dopamine and 3'-phosphoadenosine 5'-phosphate., Lu JH, Li HT, Liu MC, Zhang JP, Li M, An XM, Chang WR, Biochem Biophys Res Commun. 2005 Sep 23;335(2):417-23. PMID:16083857 Page seeded by OCA on Sat May 3 18:33:45 2008
Categories: Aryl sulfotransferase | Homo sapiens | Single protein | An, X M. | Chang, W R. | Li, H T. | Li, M. | Liu, M C. | Lu, J H. | Zhang, J P. | Complex | Crystal structure | Dopamine | Sulfotransferase | Sult1a3
