当前位置: 首页 > 文章 > 火鸡肌肉丙氨酰氨肽酶的酶学特性 食品科学 2013,34 (9) 205-209
Position: Home > Articles > 火鸡肌肉丙氨酰氨肽酶的酶学特性 FOOD SCIENCE 2013,34 (9) 205-209

火鸡肌肉丙氨酰氨肽酶的酶学特性

作  者:
田甜;魏延玲;何立超;阮贵萍;张迎阳;章建浩
单  位:
国家肉品质量安全控制工程技术研究中心
关键词:
火鸡;丙氨酰氨肽酶;盐分;氨基酸;反馈抑制
摘  要:
通过45%~65%的硫酸铵沉淀法,从火鸡肌肉中分离得到初步纯化的丙氨酰氨肽酶(AAP,EC 3.4.11.14),研究其酶学特性及盐分和AAP水解产物对其酶活力的影响.结果表明:AAP的最适反应温度为37~39℃,最适pH值约为6.8~7.5.0.8mol/L的NaCl仅抑制10%的AAP相对酶活力,说明盐分对AAP的酶活力抑制作用较弱;AAP主要水解产物丙氨酸(Ala)对AAP几乎没有抑制作用,而其他产物氨基酸均对AAP有较显著的反馈抑制作用(P<0.05),对AAP的抑制作用强弱顺序为苯丙氨酸>赖氨酸>亮氨酸>甲硫氨酸.
单  位:
National Center of Meat Quality and Safety Control,Key Laboratory of Meat Processing and Quality Control,Ministry of Education,Key Laboratory of Animal Products Processing and Quality Control,Ministry of Agriculture,College of Food Science and Technology,Nanjing Agricultural University,Nanjing 210095,China
关键词:
turkey%alanine aminopeptidase%salt%amino acids%feedback inhibition
摘  要:
An alanine aminopeptidase(AAP,EC 3.4.11.14) was purified from turkey skeletal muscle by using 45%-65% ammonium sulphate fractionation,its enzymatic properties and the effect of salt and its hydrolysis products on enzyme activity was studied.The results showed that optimal reaction temperature of AAP was 37-39 ℃,and the optimal pH was approximately 6.8-7.5.In addition,0.8 mol/L NaCl revealed the inhibition on the activity of AAP by 10% so that salt had a weakly inhibitory function to AAP activity.Alanine(Ala),as the major hydrolysis product,almost had no inhibitory effect on AAP,while the other amino acids had significant feedback inhibition(P < 0.05) on AAP.We found that 100 mmol/L phenylalanine(Phe),lysine(Lys),leucine(Leu) and methionine(Met) could inhibit the activity of AAP,and the sequence of inhibitory is Phe > Lys > Leu > Met.

相似文章

计量
文章访问数: 11
HTML全文浏览量: 0
PDF下载量: 0

所属期刊

推荐期刊