期刊
JOURNAL OF THROMBOSIS AND THROMBOLYSIS
卷 39, 期 1, 页码 71-78出版社
SPRINGER
DOI: 10.1007/s11239-014-1093-2
关键词
Clot buster; Streptokinase; Streptococcus equinus VIT_VB2; beta-Hemolytic Streptococci; Thrombolytics; Myocardial infarction
Streptokinase (SK) is an extracellular enzyme secreted by various strains of beta-hemolytic Streptococci. The main focus of the current study is to evaluate the in vitro thrombolytic activity of purified SK extracted from Streptococcus equinus VIT_VB2 (Accession no. JX406835) isolated from milk sample. The growth rate of S. equinus VIT_VB2 strain was studied with pH and biomass content which has positive significant effect on enzyme yield. A temperature of 10 degrees C and pH of 6 was found to be optimum for maximum SK activity. The specific activity of the purified SK produced by VIT_VB2 strain was found to be 6,585 IU mg(-1). The molecular mass of the enzyme was determined as 47 kDa by SDS-PAGE. In vitro thrombolytic activity of purified SK was determined using synthetic chromogenic substrate S-2251, the activity of the purified enzyme was found to be 6,330 +/- 2.2 IU. The purity of SK was compared with standard SK by HPLC. This is the first report which reveals the SK activity of S. equinus isolated from milk sample.
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