当前位置: 首页 > 文章 > 几种重金属离子对中华绒螯蟹N-乙酰-β-D-氨基葡萄糖苷酶活力的影响 水生生物学报 2008,32 (6) 850-855
Position: Home > Articles > EFFECTS OF SOME HEAVY METAL ON THE N-ACETYL-β-D-GLUCOSAMINIDASE FROM ERIOCHEIR SINENSIS Acta Hydrobiologica Sinica 2008,32 (6) 850-855

几种重金属离子对中华绒螯蟹N-乙酰-β-D-氨基葡萄糖苷酶活力的影响

作  者:
黄小红;陈宏惠;刘建昌;金艳冬;肖其韬
单  位:
福建农林大学动物科学学院动物保健研究所
关键词:
中华绒螯蟹;N-乙酰-β-D-氨基葡萄糖苷酶;酶活力;重金属离子;作用机理
摘  要:
本文研究了Cu2+、Pb2+、Zn2+和Ag+等重金属离子对中华绒螯蟹(Eriocheir sinensis)N-乙酰-β-D-氨基葡萄糖苷酶(NAGase)活力的影响。其结果表明:Cu2+、Pb2+和Zn2+对酶活力有不同程度的抑制作用,Cu2+和Zn2+对酶的抑制作用均表现为非竞争性抑制类型,Cu2+和Zn2+对酶的抑制常数(KI)分别为1.25mmol/L和8.10mmo/L;Pb2+对酶的抑制作用表现为混合型抑制类型,其对酶的抑制常数KI与KIS分别为10.44mmol/L和2.18mmol/L。Ag+对酶的效应为先激活后抑制,其抑制作用表现为反竞争性抑制,Ag+对结合酶(ES)的抑制常数KIS为204.51mmol/L。
译  名:
EFFECTS OF SOME HEAVY METAL ON THE N-ACETYL-β-D-GLUCOSAMINIDASE FROM ERIOCHEIR SINENSIS
作  者:
HUANG Xiao-Hong,CHEN Hong-Hui,LIU Jian-Chang,JIN Yan-Dong and XIAO Qi-Tao(Institute of Animal Health,College of Animal Science,Fujian Agriculture and Forestry University,Fuzhou 350002)
关键词:
Eriocheir sinensis;N-Acetyl-β-D-glucosaminidase;Activity;Metal ions;Mechanism of action
摘  要:
The effects of heavy metal ions(Cu2+,Pb2+,Zn2+ and Ag+)on N-Acetyl-β-D-glucosaminidase from Eriocheir sinensis were studied.The results showed that Cu2+,Pb2+ and Zn2+ inhibited the activity of enzyme in vary degree.Cu2+ and Zn2+ were both reversible non-competitive inhibitors.The inhibition constants of free enzyme(KI) of Cu2+ and Zn2+ were 1.25 mmol/L and 8.10mmol/L,respectively.Pb2+ was reversible mixed-type inhibition.The inhibition constants of free enzyme(KI) and enzyme-substrate complex(KIS) of Pb2+ were determined to be 10.44mmol/L and 2.18mmol/L,respectively.Ag+ activated the enzyme at low concentrations,but it inhibited the enzyme at higher concentrations as a reversible un-competitive inhibitor.The inhibition constants(KIS) was 204.51mmol/L.

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