8I2Q

Beijerinckia indica beta-fructosyltransferase variant H395R/F473Y

8I2Q の概要

• エントリーDOI: 10.2210/pdb8i2q/pdb
• 分子名称: Beta-fructosyltransferase, GLYCEROL (3 entities in total)
• 機能のキーワード: beta-fructosyltransferase, hydrolase, transferase
• 由来する生物種: Beijerinckia indica subsp. indica
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 57224.03

構造登録者

Tonozuka, T. (登録日: 2023-01-15, 公開日: 2023-06-14, 最終更新日: 2024-10-23)

主引用文献

Li, D.,Miyasaka, Y.,Kubota, A.,Kozono, T.,Kitano, Y.,Sasaki, N.,Fujii, T.,Tochio, T.,Kadota, Y.,Nishikawa, A.,Tonozuka, T.
Characterization and alteration of product specificity of Beijerinckia indica subsp. indica beta-fructosyltransferase.
Biosci.Biotechnol.Biochem., 87:981-990, 2023

PubMed Abstract: The trisaccharide 1-kestose, a major constituent of fructooligosaccharide, has strong prebiotic effects. We used high-performance liquid chromatography and 1H nuclear magnetic resonance spectroscopy to show that BiBftA, a β-fructosyltransferase belonging to glycoside hydrolase family 68, from Beijerinckia indica subsp. indica catalyzes transfructosylation of sucrose to produce mostly 1-kestose and levan polysaccharides. We substituted His395 and Phe473 in BiBftA with Arg and Tyr, respectively, and analyzed the reactions of the mutant enzymes with 180 g/L sucrose. The ratio of the molar concentrations of glucose and 1-kestose in the reaction mixture with wild-type BiBftA was 100:8.1, whereas that in the reaction mixture with the variant H395R/F473Y was 100:45.5, indicating that H395R/F473Y predominantly accumulated 1-kestose from sucrose. The X-ray crystal structure of H395R/F473Y suggests that its catalytic pocket is unfavorable for binding of sucrose while favorable for transfructosylation.

PubMed: 37280168
DOI: 10.1093/bbb/zbad074

実験手法

X-RAY DIFFRACTION (2.15 Å)