1DCP

DCOH, A BIFUNCTIONAL PROTEIN-BINDING TRANSCRIPTIONAL COACTIVATOR, COMPLEXED WITH BIOPTERIN

1DCP の概要

• エントリーDOI: 10.2210/pdb1dcp/pdb
• 分子名称: DCOH, 7,8-DIHYDROBIOPTERIN (3 entities in total)
• 機能のキーワード: transcriptional stimulator, dimerization cofactor, dehydratase, 4a-carbinolamine dehydratase, transregulator of homeodomain proteins
• 由来する生物種: Rattus norvegicus (Norway rat)
• タンパク質・核酸の鎖数: 8
• 化学式量合計: 98054.67

構造登録者

Cronk, J.D.,Endrizzi, J.A.,Alber, T. (登録日: 1996-05-16, 公開日: 1996-12-07, 最終更新日: 2024-02-07)

主引用文献

Cronk, J.D.,Endrizzi, J.A.,Alber, T.
High-resolution structures of the bifunctional enzyme and transcriptional coactivator DCoH and its complex with a product analogue.
Protein Sci., 5:1963-1972, 1996

PubMed Abstract: DCoH, the dimerization cofactor of hepatocyte nuclear factor 1 (HNF-1), functions as both a transcriptional coactivator and a pterin dehydratase. To probe the relationship between these two functions, the X-ray crystal structures of the free enzyme and its complex with the product analogue 7,8-dihydrobiopterin were refined at 2.3 A resolution. The ligand binds at four sites per tetrameric enzyme, with little apparent conformational change in the protein. Each active-site cleft is located in a subunit interface, adjacent to a prominent saddle motif that has structural similarities to the TATA binding protein. The pterin binds within an arch of aromatic residues that extends across one dimer interface. The bound ligand makes contacts to three conserved histidines, and this arrangement restricts proposals for the enzymatic mechanism of dehydration. The dihedral symmetry of DCoH suggests that binding to the dimerization domain of HNF-1 likely involves the superposition of two-fold rotation axes of the two proteins.

PubMed: 8897596

実験手法

X-RAY DIFFRACTION (2.3 Å)