2BGH

Crystal structure of Vinorine Synthase

2BGH の概要

• エントリーDOI: 10.2210/pdb2bgh/pdb
• 分子名称: VINORINE SYNTHASE (2 entities in total)
• 機能のキーワード: vs, bahd, acetyltransferase, auto-rickshaw, transferase
• 由来する生物種: RAUVOLFIA SERPENTINA (SERPENTWOOD)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 93748.91

構造登録者

Ma, X.,Koepke, J.,Panjikar, S.,Fritzsch, G.,Stoeckigt, J. (登録日: 2004-12-22, 公開日: 2005-01-24, 最終更新日: 2024-11-06)

主引用文献

Ma, X.,Koepke, J.,Panjikar, S.,Fritzsch, G.,Stockigt, J.
Crystal Structure of Vinorine Synthase, the First Representative of the Bahd Superfamily.
J.Biol.Chem., 280:13576-, 2005

PubMed Abstract: Vinorine synthase is an acetyltransferase that occupies a central role in the biosynthesis of the antiarrhythmic monoterpenoid indole alkaloid ajmaline in the plant Rauvolfia. Vinorine synthase belongs to the benzylalcohol acetyl-, anthocyanin-O-hydroxy-cinnamoyl-, anthranilate-N-hydroxy-cinnamoyl/benzoyl-, deacetylvindoline acetyltransferase (BAHD) enzyme superfamily, members of which are involved in the biosynthesis of several important drugs, such as morphine, Taxol, or vindoline, a precursor of the anti-cancer drugs vincaleucoblastine and vincristine. The x-ray structure of vinorine synthase is described at 2.6-angstrom resolution. Despite low sequence identity, the two-domain structure of vinorine synthase shows surprising similarity with structures of several CoA-dependent acyltransferases such as dihydrolipoyl transacetylase, polyketide-associated protein A5, and carnitine acetyltransferase. All conserved residues typical for the BAHD family are found in domain 1. His160 of the HXXXD motif functions as a general base during catalysis. It is located in the center of the reaction channel at the interface of both domains and is accessible from both sides. The channel runs through the entire molecule, allowing the substrate and co-substrate to bind independently. Asp164 points away from the catalytic site and seems to be of structural rather than catalytic importance. Surprisingly, the DFGWG motif, which is indispensable for the catalyzed reaction and unique to the BAHD family, is located far away from the active site and seems to play only a structural role. Vinorine synthase represents the first solved protein structure of the BAHD superfamily.

PubMed: 15665331
DOI: 10.1074/JBC.M414508200

実験手法

X-RAY DIFFRACTION (2.6 Å)