2a3r: Difference between revisions

[[Image:2a3r.gif|left|200px]]<br /><applet load="2a3r" size="350" color="white" frame="true" align="right" spinBox="true"  

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.

2A3R is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=A3P:'>A3P</scene> and <scene name='pdbligand=LDP:'>LDP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Aryl_sulfotransferase Aryl sulfotransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.8.2.1 2.8.2.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A3R OCA].  

[[Category: An, X M.]]

[[Category: Chang, W R.]]

[[Category: Li, H T.]]

[[Category: Liu, M C.]]

[[Category: Lu, J H.]]

[[Category: Zhang, J P.]]

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:23:21 2008''