721MEDIA OPTIMIZATION FOR Β-KETOTHIOLASE IN PRODUCTION OF POLY Β-HYDROXYBUTYRATE FROM HALOARCULA SP. 1, AN EXTREME HALOPHILIC ARCHAEAOne of the eye catching subjects in the scientific community is environmental friendly and economic production of bioplastics [Poly β-hydroxybutyrate (PHB)]. Most of the research on PHB using microbes has been directed towards the processes which are costly. However, PHB productions from Halophilic Archaea which are extremophiles have been completely overlooked. Halophilic archaea offer certain advantages as requiring non sterile conditions for growth which makes the process completely cost effective. The present work aims at PHB production by halophilic archaea with optimization of the enzymes β-ketothiolase as primary precursor of PHB production. Amongst the three key enzymes for PHB biosynthesis, β -ketothiolase is a primary enzyme required for PHB synthesis. The information on β-ketothiolase from the archaeal domain, especially from Haloarchaea, is very sparse. Hence the present study is directed towards detection of β -kethiolase from Haloarcula sp. 1., and its optimization. Optimization has been carried out by using fifteen different parameters. As a result of optimization, maximum enzyme activity (0.047EU/ml) was exhibited by Haloarcula sp. 1., Which is also the maximum PHB producerapexasoni6@gmail.comResearch722016 β-ketothiolase, poly β-hydroxybutyrate,Extremely halophilic ArchaeaApexa Patadia,Bharti P DaveDepartment of Biotechnology, Shree M. & N. Virani Science College, Rajkot, Gujarat, India,Department of Biotechnology, Shree M. & N. Virani Science College, Rajkot, Gujarat, India