食品科学 ›› 2010, Vol. 31 ›› Issue (5): 160-164.doi: 10.7506/spkx1002-6300-201005036

• 生物工程 • 上一篇    下一篇

牛肉半腱肌焦磷酸酶的分离纯化及特性研究

孙珍珍,彭增起* ,靳红果,史 杰   

  1. 南京农业大学 教育部肉品加工与质量控制重点实验室
  • 收稿日期:2009-07-01 修回日期:2009-10-30 出版日期:2010-03-01 发布日期:2010-12-29
  • 通讯作者: 彭增起 E-mail:zqpeng@njau.edu.cn
  • 基金资助:

    农业部现代农业(牛肉)产业技术体系专项经费资助项目(MATS-Beef Cattle System)

Purification and Properties of Pyrophosphatase from Beef Semitendinosus

SUN Zhen-zhen,PENG Zeng-qi*,JIN Hong-guo,SHI Jie   

  1. Key Laboratory of Animal Products Processing and Quality Control, Ministry of Education,Nanjing Agricultural University, Nanjing 210095, China
  • Received:2009-07-01 Revised:2009-10-30 Online:2010-03-01 Published:2010-12-29
  • Contact: PENG Zeng-qi*, E-mail:zqpeng@njau.edu.cn

摘要:

对牛肉半腱肌中焦磷酸酶进行分离纯化并对其特性进行研究。将牛肉半腱肌用0.25mol/L 蔗糖溶液冰浴匀浆后再用0.6mol/L NaCl 提取、50%~70% 饱和度硫酸铵分级沉淀、DEAE-52 纤维素离子交换柱层析,得到纯的焦磷酸酶。通过SDS-PAGE 分析,该酶的分子质量为72kD。实验进一步得出牛肉半腱肌中焦磷酸酶有较强的底物专一性,对底物焦磷酸四钠(PP)水解作用强。Mg2+ 是其激活剂,Ca2+、EDTA-Na2、EDTA-Na4 抑制其酶活性。以PP 为底物,测得该酶的初速度时间范围为25min,最适pH 值为6.8,最适温度为47℃。

关键词: 牛肉半腱肌, 焦磷酸酶, 分离纯化, 特性

Abstract:

Pyrophosphatase (PPase) was isolated and purified from beef semitendinosus through homogenization with 0.25 mol/L sucrose, extraction with 0.6 mol/L NaCl solution, precipitation with 50%-70% ammonium sulfate, and ion-exchange chromatography on DEAE-52 cellulose column. SDS-PAGE showed a single band with the relative molecular mass of 72 kD. This enzyme exhibited high substrate specificity to sodium pyrophosphate. Mg2+ as an activator could promote the activity of pyrophosphatase; whereas, Ca2+, EDTA-Na2 and EDTA-Na4 all exhibited an inhibitory effect on its activity. The optimal pH and temperature for reaction were 6.8 and 47 ℃, respectively.

Key words: beef semitendinosus, pyrophosphatase, purification, property

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