CRISPR-Cas9 mediated knockout of SagD gene for overexpression of streptokinase in Streptococcus equisimilis

Streptokinase is an enzyme that can break down the blood clots in some cases of myocardial infarction (Heart attack), pulmonary embolism, and arterial thromboembolism. Demand for streptokinase is high globally than the production due to increased incidences of various heart conditions. The main sour...

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Bibliographic Details
Published inbioRxiv
Main Authors Chaudhari, Armi, Vyas, Sachin, Singh, Vijai, Patel, Amrutlal, Joshi, Chaitanya, Joshi, Madhvi
Format Paper
LanguageEnglish
Published Cold Spring Harbor Cold Spring Harbor Laboratory Press 20.10.2021
Subjects
Blood coagulation
CRISPR
Embolism
Gene expression
Gene regulation
mRNA stability
Myocardial infarction
Post-transcription
Streptococcus
Streptococcus equisimilis
Streptokinase
Therapeutic applications
Thromboembolism
Thrombolysis
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Summary:Streptokinase is an enzyme that can break down the blood clots in some cases of myocardial infarction (Heart attack), pulmonary embolism, and arterial thromboembolism. Demand for streptokinase is high globally than the production due to increased incidences of various heart conditions. The main source of streptokinase is from various strains of Streptococcus. Expression of streptokinase in native strain Streptococcus equisimilis is limited due to the SagD inhibitor gene for production of streptokinase that needs to be knocked out in order to increase it expression. However, FasX is a small RNA (sRNA) present in group A Streptococcus species which is responsible for post-transcriptional regulation of streptokinase (ska) gene by binding at the 5' end of ska mRNA. S. equisimilis is a β-hemolysin producing streptococcus bacterium (group C) containing the orthologue of FasX and natively expresses a clinically important thrombolytic streptokinase. In order to improve the stability of mRNA and increasing the expression of streptokinase which is inhibited by SagD. We used CRISPR-Cas9 to successfully knock- out of SagD gene and observed a 13.58-fold relative quantification of streptokinase expression in the mutant strain as compared to wild type. We have also demonstrated the successful target gene knockout using CRISPR-Cas9 in S. equisimilis that engineered strain can be used further for overexpression of streptokinase for therapeutic applications. Competing Interest Statement The authors have declared no competing interest.
DOI:10.1101/2021.10.20.465095