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The aim of this study was to isolate and characterize streptokinase-producing β-hemolytic Streptococcus sp. from bovine milk. A total of 50 milk samples were collected randomly from different breeds of cow and goat (Vellore, Tamil Nadu, India). The samples were characterized and screened for streptokinase-producing isolates using microbial and biochemical analysis. About 97 colonies were isolated from milk samples showing hemolytic patterns of α (19.6%), β (24.7%) and γ (55.6 %). Out of 20β-hemolytic isolates, only 6 colonies (VB2, VB3, VB8, VB14, VB16, and VB17) were identified as β-hemolytic Streptococci as potent producers of streptokinase. VB2 and VB14 showed the greatest streptokinase activities of 265 U mL(-1) and 225 U mL(-1), respectively. Based on biochemical and molecular characterization, the potent isolates VB2 and VB14 were identified and confirmed as S. equinus and S. agalactiae, respectively. The identified strains were named Streptococcus equinus VIT_VB2 (GenBank accession no. JX406835) and Streptococcus agalactiae VITVS5 (GenBank accession No. KF186620) The strains isolated from bovine milk provide a variance in the fibrinolytic activity on blood clots. The current study has demonstrated that the isolation of streptokinase producers from bovine milk, and the production of streptokinase from novel strain, enhanced the fibrinolytic activity. This study is the first to report that Streptococcus equinus produces streptokinase.

journal of general and applied microbiology

Exploring the &lt;i&gt;in vitro&lt;/i&gt; thrombolytic potential of streptokinase-producing &lt;i&gt;β&lt;/i&gt;-hemolytic &lt;i&gt;Streptococci&lt;/i&gt; isolated from bovine milk