Streptokinase (SK) is a monomeric, multidomain protein of 47 kDa, produced by several beta-hemolytic Streptococci. It has potential therapeutic activity in blood circulatory conditions especially myocardial infarctions . SK is one of the major blood clot dissolving agents used in many medical treatments. SK gene of S. pyogenes was successfully amplified by hot start PCR product was 1353 bp. It was cloned in pTargeT and pSin vectors and clone containing gene in right orientation were selected after... Mehr