1Q1Q

Crystal structure of human pregnenolone sulfotransferase (SULT2B1a) in the presence of PAP

Summary for 1Q1Q

• Entry DOI: 10.2210/pdb1q1q/pdb
• Related: 1Q1Z 1Q20 1Q22
• Descriptor: sulfotransferase family, cytosolic, 2B, member 1 isoform a, SODIUM ION, ADENOSINE-3'-5'-DIPHOSPHATE, ... (5 entities in total)
• Functional Keywords: sulfotransferase, pregnenolone, sult2b1, pap, transferase
• Biological source: Homo sapiens (human)
• Cellular location: Cytoplasm: O00204
• Total number of polymer chains: 1
• Total formula weight: 40510.64

Authors

Lee, K.A.,Fuda, H.,Lee, Y.C.,Negishi, M.,Strott, C.A.,Pedersen, L.C. (deposition date: 2003-07-22, release date: 2003-11-11, Last modification date: 2023-08-16)

Primary citation

Lee, K.A.,Fuda, H.,Lee, Y.C.,Negishi, M.,Strott, C.A.,Pedersen, L.C.
Crystal structure of human cholesterol sulfotransferase (SULT2B1b) in the presence of pregnenolone and 3'-phosphoadenosine 5'-phosphate. Rationale for specificity differences between prototypical SULT2A1 and the SULT2BG1 isoforms.
J.Biol.Chem., 278:44593-44599, 2003

PubMed Abstract: The gene for human hydroxysteroid sulfotransferase (SULT2B1) encodes two peptides, SULT2B1a and SULT2B1b, that differ only at their amino termini. SULT2B1b has a predilection for cholesterol but is also capable of sulfonating pregnenolone, whereas SULT2B1a preferentially sulfonates pregnenolone and only minimally sulfonates cholesterol. We have determined the crystal structure of SULT2B1a and SULT2B1b bound to the substrate donor product 3'-phosphoadenosine 5'-phosphate at 2.9 and 2.4 A, respectively, as well as SULT2B1b in the presence of the acceptor substrate pregnenolone at 2.3 A. These structures reveal a different catalytic binding orientation for the substrate from a previously determined structure of hydroxysteroid sulfotransferase (SULT2A1) binding dehydroepiandrosterone. In addition, the amino-terminal helix comprising residues Asp19 to Lys26, which determines the specificity difference between the SULT2B1 isoforms, becomes ordered upon pregnenolone binding, covering the substrate binding pocket.

PubMed: 12923182
DOI: 10.1074/jbc.M308312200

Experimental method

X-RAY DIFFRACTION (2.91 Å)