食品科学 ›› 2006, Vol. 27 ›› Issue (3): 79-82.

• 基础研究 • 上一篇    下一篇

一株曲霉果糖转移酶酶学性质及底物特异性

 王立梅, 周惠明   

  1. 江南大学食品学院
  • 出版日期:2006-03-15 发布日期:2011-09-06

Properties and Substrate Specifity of Fructosyltransferase from Aspergillus sp.JN19

 WANG  Li-Mei, ZHOU  Hui-Ming   

  1. School of Food Science and Technology, Southern Yangtze University, Wuxi 214036, China
  • Online:2006-03-15 Published:2011-09-06

摘要: 一株野生曲霉(Aspergillussp.JN19)所产果糖转移酶为胞内酶,该酶的最适反应温度为50℃,在45~52℃范围内能够保持较高的酶活性;反应的最适pH为5.5,pH在4.0~6.0的范围内酶活力稳定;Mg2+对该酶具有激活作用,可以使酶活力提高2.2倍,Cu2+则完全抑制果糖转移酶活力;该酶能够催化蔗糖分子中的果糖基转移形成新的低聚糖;该酶具有广泛的受体特异性。

关键词: 低聚糖, 果糖转移酶, 底物特异性

Abstract: The result indicated that the fructosyltransferase from a wild strain of Aspergillus sp.JN19 was a intracellular enzyme.The optimum temperature and pH for the high activity of fructosyltransferase were 50℃ and 5.5, respectively. Mg2+ ions enhancedfructosyltransferase activity by 2.2-fold whereas Cu2+ ions completely inhibited enzyme activity. The enzyme synthesized newfructosyl oligosacchrides by transfering fructose moiety of sucrose to various acceptors.

Key words: oligosaccharides, fructosyltransferse, substrate specifity