摘要
通过离子交换和凝胶过滤层析从湖南产尖吻蝮蛇毒中分离纯化出1个抗补体活性蛋白AACI-I.还原与非还原SDS-PAGE测得其表观分子质量分别为26 kD和22 kD,等电聚焦电泳显示其等电点为pH 8.9.它能抑制补体经典途径和替代途径的溶血,且该作用具有量效和时效性.AACI-I可依次水解纤维蛋白原的Aα、Bβ、γ链,此活性能被EDTA、EGTA和1,10-phenanthroline完全抑制,不受PMSF、SBTI作用影响.同时,该蛋白无精氨酸酯酶活性,提示AACI-I是金属蛋白酶.另外,AACI-I具有azocasein水解活性和水肿活性,当0.01μg/g AACI-I注射小鼠足趾,其诱导肿胀率约为(14.06±6.78)%,而小鼠皮下注射2.6μg/g AACI-Ⅰ后没有发现其有出血毒活性.
An anticomplementary protein AACI-I was purified from Agkistrodon acutus venom by a combination of ion-exchange and gel filtration chromatography.Its apparent molecular weight was estimated as 26 kD and 22 kD by SDS-PAGE under reducing and non-reducing conditions,respectively.Its isoelectric point was pH 8.9 by IEF.It inhibits serum complement haemolytic activity both via classical and alternative pathway in a dose,time-dependent fashion.AACI-I could cleave Aα,Bβ,γ chain of fibrinogen successively.This activity was inhibited by EDTA,EGTA,1,10-phenanthroline,but not PMSF or soybean trypsin inhibitor,while it has no arginine esterase activity,indicating that AACI-I was a metalloproteinase.Furthermore,AACI-I exhibited proteolytic activity toward azocasein and it has edema activity,as AACI-I was injected in the foot pad of mice with dose of 0.01 μg /g body weight.The ratio of swelling was calculated as(14.06 ± 6.78)%,and there was no hemorrhagic point after injected subcutaneously into mice with dose of 2.6 μg /g body weight.
出处
《中国生物化学与分子生物学报》
CAS
CSCD
北大核心
2010年第11期1036-1043,共8页
Chinese Journal of Biochemistry and Molecular Biology
基金
国家自然科学基金资助项目(No.30560035)
国家重点基础研究发展计划(973计划)资助项目(No.2009CB526512
2007CB516813)
贵州省优秀青年科技人才资助项目(No.黔科合人字2005-0510)~~
关键词
尖吻蝮蛇毒
抗补体活性
金属蛋白酶
纤维蛋白原水解活性
Agkistrodon acutus venom
anticomplementary activity
metalloproteinase
fibrinogenolytic activity