8CK7

Avidin complexed to theophylline

8CK7 の概要

• エントリーDOI: 10.2210/pdb8ck7/pdb
• 分子名称: Avidin, GLYCEROL, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (6 entities in total)
• 機能のキーワード: avidin, theophylline, xanthine, protein binding
• 由来する生物種: Gallus gallus (chicken)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 28810.11

構造登録者

De March, M. (登録日: 2023-02-14, 公開日: 2023-12-27, 最終更新日: 2024-11-06)

主引用文献

Spinello, A.,Lapenta, F.,De March, M.
The avidin-theophylline complex: A structural and computational study.
Proteins, 91:1437-1443, 2023

PubMed Abstract: The interaction between avidin and its counterpart biotin is one of central importance in biology and has been reproposed and studied at length. However, the binding pocket of avidin is prone to promiscuous binding, able to accommodate even non-biotinylated ligands. Comprehending the factors that distinguish the extremely strong interaction with biotin to other ligands is an important step to fully picture the thermodynamics of these low-affinity complexes. Here, we present the complex between chicken white egg avidin and theophylline (TEP), the xanthine derivative used in the therapy of asthma. In the crystal structure, TEP lies in the biotin-binding pocket with the same orientation and planarity of the aromatic ring of 8-oxodeoxyguanosine. Indeed, its affinity for avidin measured by isothermal titration calorimetry is in the same μM range as those obtained for the previously characterized nucleoside derivatives. By the use of molecular dynamic simulations, we have investigated the most important intermolecular interactions occurring in the avidin-TEP binding pocket and compared them with those obtained for the avidin 8-oxodeoxyguanosine and avidin-biotin complexes. These results testify the capability of avidin to complex purely aromatic molecules.

PubMed: 37318226
DOI: 10.1002/prot.26538

実験手法

X-RAY DIFFRACTION (2.2 Å)